ocfs2: use scnprintf() for avoiding potential buffer overflow

Since snprintf() returns the would-be-output size instead of the actual
output size, the succeeding calls may go beyond the given buffer limit.
Fix it by replacing with scnprintf().

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joseph Qi <jiangqi903@gmail.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Jun Piao <piaojun@huawei.com>
Link: http://lkml.kernel.org/r/20200311093516.25300-1-tiwai@suse.de
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c
index 78cb48d..89d13e0 100644 (file)
--- a/fs/ocfs2/cluster/heartbeat.c
+++ b/fs/ocfs2/cluster/heartbeat.c
@@ -1307,7 +1307,7 @@ static int o2hb_debug_open(struct inode *inode, struct file *file)
 
        case O2HB_DB_TYPE_REGION_NUMBER:
                reg = (struct o2hb_region *)db->db_data;
-               out += snprintf(buf + out, PAGE_SIZE - out, "%d\n",
+               out += scnprintf(buf + out, PAGE_SIZE - out, "%d\n",
                                reg->hr_region_num);
                goto done;
 
@@ -1317,12 +1317,12 @@ static int o2hb_debug_open(struct inode *inode, struct file *file)
                /* If 0, it has never been set before */
                if (lts)
                        lts = jiffies_to_msecs(jiffies - lts);
-               out += snprintf(buf + out, PAGE_SIZE - out, "%lu\n", lts);
+               out += scnprintf(buf + out, PAGE_SIZE - out, "%lu\n", lts);
                goto done;
 
        case O2HB_DB_TYPE_REGION_PINNED:
                reg = (struct o2hb_region *)db->db_data;
-               out += snprintf(buf + out, PAGE_SIZE - out, "%u\n",
+               out += scnprintf(buf + out, PAGE_SIZE - out, "%u\n",
                                !!reg->hr_item_pinned);
                goto done;
 
@@ -1331,8 +1331,8 @@ static int o2hb_debug_open(struct inode *inode, struct file *file)
        }
 
        while ((i = find_next_bit(map, db->db_len, i + 1)) < db->db_len)
-               out += snprintf(buf + out, PAGE_SIZE - out, "%d ", i);
-       out += snprintf(buf + out, PAGE_SIZE - out, "\n");
+               out += scnprintf(buf + out, PAGE_SIZE - out, "%d ", i);
+       out += scnprintf(buf + out, PAGE_SIZE - out, "\n");
 
 done:
        i_size_write(inode, out);

diff --git a/fs/ocfs2/cluster/netdebug.c b/fs/ocfs2/cluster/netdebug.c
index 02bf4a1..667a5c5 100644 (file)
--- a/fs/ocfs2/cluster/netdebug.c
+++ b/fs/ocfs2/cluster/netdebug.c
@@ -443,8 +443,8 @@ static int o2net_fill_bitmap(char *buf, int len)
        o2net_fill_node_map(map, sizeof(map));
 
        while ((i = find_next_bit(map, O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES)
-               out += snprintf(buf + out, PAGE_SIZE - out, "%d ", i);
-       out += snprintf(buf + out, PAGE_SIZE - out, "\n");
+               out += scnprintf(buf + out, PAGE_SIZE - out, "%d ", i);
+       out += scnprintf(buf + out, PAGE_SIZE - out, "\n");
 
        return out;
 }

diff --git a/fs/ocfs2/dlm/dlmdebug.c b/fs/ocfs2/dlm/dlmdebug.c
index c5c6efb..4b8b41d 100644 (file)
--- a/fs/ocfs2/dlm/dlmdebug.c
+++ b/fs/ocfs2/dlm/dlmdebug.c
@@ -244,11 +244,11 @@ static int stringify_lockname(const char *lockname, int locklen, char *buf,
                memcpy((__be64 *)&inode_blkno_be,
                       (char *)&lockname[OCFS2_DENTRY_LOCK_INO_START],
                       sizeof(__be64));
-               out += snprintf(buf + out, len - out, "%.*s%08x",
+               out += scnprintf(buf + out, len - out, "%.*s%08x",
                                OCFS2_DENTRY_LOCK_INO_START - 1, lockname,
                                (unsigned int)be64_to_cpu(inode_blkno_be));
        } else
-               out += snprintf(buf + out, len - out, "%.*s",
+               out += scnprintf(buf + out, len - out, "%.*s",
                                locklen, lockname);
        return out;
 }
@@ -260,7 +260,7 @@ static int stringify_nodemap(unsigned long *nodemap, int maxnodes,
        int i = -1;
 
        while ((i = find_next_bit(nodemap, maxnodes, i + 1)) < maxnodes)
-               out += snprintf(buf + out, len - out, "%d ", i);
+               out += scnprintf(buf + out, len - out, "%d ", i);
 
        return out;
 }
@@ -278,34 +278,34 @@ static int dump_mle(struct dlm_master_list_entry *mle, char *buf, int len)
                mle_type = "MIG";
 
        out += stringify_lockname(mle->mname, mle->mnamelen, buf + out, len - out);
-       out += snprintf(buf + out, len - out,
+       out += scnprintf(buf + out, len - out,
                        "\t%3s\tmas=%3u\tnew=%3u\tevt=%1d\tuse=%1d\tref=%3d\n",
                        mle_type, mle->master, mle->new_master,
                        !list_empty(&mle->hb_events),
                        !!mle->inuse,
                        kref_read(&mle->mle_refs));
 
-       out += snprintf(buf + out, len - out, "Maybe=");
+       out += scnprintf(buf + out, len - out, "Maybe=");
        out += stringify_nodemap(mle->maybe_map, O2NM_MAX_NODES,
                                 buf + out, len - out);
-       out += snprintf(buf + out, len - out, "\n");
+       out += scnprintf(buf + out, len - out, "\n");
 
-       out += snprintf(buf + out, len - out, "Vote=");
+       out += scnprintf(buf + out, len - out, "Vote=");
        out += stringify_nodemap(mle->vote_map, O2NM_MAX_NODES,
                                 buf + out, len - out);
-       out += snprintf(buf + out, len - out, "\n");
+       out += scnprintf(buf + out, len - out, "\n");
 
-       out += snprintf(buf + out, len - out, "Response=");
+       out += scnprintf(buf + out, len - out, "Response=");
        out += stringify_nodemap(mle->response_map, O2NM_MAX_NODES,
                                 buf + out, len - out);
-       out += snprintf(buf + out, len - out, "\n");
+       out += scnprintf(buf + out, len - out, "\n");
 
-       out += snprintf(buf + out, len - out, "Node=");
+       out += scnprintf(buf + out, len - out, "Node=");
        out += stringify_nodemap(mle->node_map, O2NM_MAX_NODES,
                                 buf + out, len - out);
-       out += snprintf(buf + out, len - out, "\n");
+       out += scnprintf(buf + out, len - out, "\n");
 
-       out += snprintf(buf + out, len - out, "\n");
+       out += scnprintf(buf + out, len - out, "\n");
 
        return out;
 }
@@ -353,7 +353,7 @@ static int debug_purgelist_print(struct dlm_ctxt *dlm, char *buf, int len)
        int out = 0;
        unsigned long total = 0;
 
-       out += snprintf(buf + out, len - out,
+       out += scnprintf(buf + out, len - out,
                        "Dumping Purgelist for Domain: %s\n", dlm->name);
 
        spin_lock(&dlm->spinlock);
@@ -365,13 +365,13 @@ static int debug_purgelist_print(struct dlm_ctxt *dlm, char *buf, int len)
                out += stringify_lockname(res->lockname.name,
                                          res->lockname.len,
                                          buf + out, len - out);
-               out += snprintf(buf + out, len - out, "\t%ld\n",
+               out += scnprintf(buf + out, len - out, "\t%ld\n",
                                (jiffies - res->last_used)/HZ);
                spin_unlock(&res->spinlock);
        }
        spin_unlock(&dlm->spinlock);
 
-       out += snprintf(buf + out, len - out, "Total on list: %lu\n", total);
+       out += scnprintf(buf + out, len - out, "Total on list: %lu\n", total);
 
        return out;
 }
@@ -410,7 +410,7 @@ static int debug_mle_print(struct dlm_ctxt *dlm, char *buf, int len)
        int i, out = 0;
        unsigned long total = 0, longest = 0, bucket_count = 0;
 
-       out += snprintf(buf + out, len - out,
+       out += scnprintf(buf + out, len - out,
                        "Dumping MLEs for Domain: %s\n", dlm->name);
 
        spin_lock(&dlm->master_lock);
@@ -428,7 +428,7 @@ static int debug_mle_print(struct dlm_ctxt *dlm, char *buf, int len)
        }
        spin_unlock(&dlm->master_lock);
 
-       out += snprintf(buf + out, len - out,
+       out += scnprintf(buf + out, len - out,
                        "Total: %lu, Longest: %lu\n", total, longest);
        return out;
 }
@@ -467,7 +467,7 @@ static int dump_lock(struct dlm_lock *lock, int list_type, char *buf, int len)
 
 #define DEBUG_LOCK_VERSION     1
        spin_lock(&lock->spinlock);
-       out = snprintf(buf, len, "LOCK:%d,%d,%d,%d,%d,%d:%lld,%d,%d,%d,%d,%d,"
+       out = scnprintf(buf, len, "LOCK:%d,%d,%d,%d,%d,%d:%lld,%d,%d,%d,%d,%d,"
                       "%d,%d,%d,%d\n",
                       DEBUG_LOCK_VERSION,
                       list_type, lock->ml.type, lock->ml.convert_type,
@@ -491,13 +491,13 @@ static int dump_lockres(struct dlm_lock_resource *res, char *buf, int len)
        int i;
        int out = 0;
 
-       out += snprintf(buf + out, len - out, "NAME:");
+       out += scnprintf(buf + out, len - out, "NAME:");
        out += stringify_lockname(res->lockname.name, res->lockname.len,
                                  buf + out, len - out);
-       out += snprintf(buf + out, len - out, "\n");
+       out += scnprintf(buf + out, len - out, "\n");
 
 #define DEBUG_LRES_VERSION     1
-       out += snprintf(buf + out, len - out,
+       out += scnprintf(buf + out, len - out,
                        "LRES:%d,%d,%d,%ld,%d,%d,%d,%d,%d,%d,%d\n",
                        DEBUG_LRES_VERSION,
                        res->owner, res->state, res->last_used,
@@ -509,17 +509,17 @@ static int dump_lockres(struct dlm_lock_resource *res, char *buf, int len)
                        kref_read(&res->refs));
 
        /* refmap */
-       out += snprintf(buf + out, len - out, "RMAP:");
+       out += scnprintf(buf + out, len - out, "RMAP:");
        out += stringify_nodemap(res->refmap, O2NM_MAX_NODES,
                                 buf + out, len - out);
-       out += snprintf(buf + out, len - out, "\n");
+       out += scnprintf(buf + out, len - out, "\n");
 
        /* lvb */
-       out += snprintf(buf + out, len - out, "LVBX:");
+       out += scnprintf(buf + out, len - out, "LVBX:");
        for (i = 0; i < DLM_LVB_LEN; i++)
-               out += snprintf(buf + out, len - out,
+               out += scnprintf(buf + out, len - out,
                                        "%02x", (unsigned char)res->lvb[i]);
-       out += snprintf(buf + out, len - out, "\n");
+       out += scnprintf(buf + out, len - out, "\n");
 
        /* granted */
        list_for_each_entry(lock, &res->granted, list)
@@ -533,7 +533,7 @@ static int dump_lockres(struct dlm_lock_resource *res, char *buf, int len)
        list_for_each_entry(lock, &res->blocked, list)
                out += dump_lock(lock, 2, buf + out, len - out);
 
-       out += snprintf(buf + out, len - out, "\n");
+       out += scnprintf(buf + out, len - out, "\n");
 
        return out;
 }
@@ -683,41 +683,41 @@ static int debug_state_print(struct dlm_ctxt *dlm, char *buf, int len)
        }
 
        /* Domain: xxxxxxxxxx  Key: 0xdfbac769 */
-       out += snprintf(buf + out, len - out,
+       out += scnprintf(buf + out, len - out,
                        "Domain: %s  Key: 0x%08x  Protocol: %d.%d\n",
                        dlm->name, dlm->key, dlm->dlm_locking_proto.pv_major,
                        dlm->dlm_locking_proto.pv_minor);
 
        /* Thread Pid: xxx  Node: xxx  State: xxxxx */
-       out += snprintf(buf + out, len - out,
+       out += scnprintf(buf + out, len - out,
                        "Thread Pid: %d  Node: %d  State: %s\n",
                        task_pid_nr(dlm->dlm_thread_task), dlm->node_num, state);
 
        /* Number of Joins: xxx  Joining Node: xxx */
-       out += snprintf(buf + out, len - out,
+       out += scnprintf(buf + out, len - out,
                        "Number of Joins: %d  Joining Node: %d\n",
                        dlm->num_joins, dlm->joining_node);
 
        /* Domain Map: xx xx xx */
-       out += snprintf(buf + out, len - out, "Domain Map: ");
+       out += scnprintf(buf + out, len - out, "Domain Map: ");
        out += stringify_nodemap(dlm->domain_map, O2NM_MAX_NODES,
                                 buf + out, len - out);
-       out += snprintf(buf + out, len - out, "\n");
+       out += scnprintf(buf + out, len - out, "\n");
 
        /* Exit Domain Map: xx xx xx */
-       out += snprintf(buf + out, len - out, "Exit Domain Map: ");
+       out += scnprintf(buf + out, len - out, "Exit Domain Map: ");
        out += stringify_nodemap(dlm->exit_domain_map, O2NM_MAX_NODES,
                                 buf + out, len - out);
-       out += snprintf(buf + out, len - out, "\n");
+       out += scnprintf(buf + out, len - out, "\n");
 
        /* Live Map: xx xx xx */
-       out += snprintf(buf + out, len - out, "Live Map: ");
+       out += scnprintf(buf + out, len - out, "Live Map: ");
        out += stringify_nodemap(dlm->live_nodes_map, O2NM_MAX_NODES,
                                 buf + out, len - out);
-       out += snprintf(buf + out, len - out, "\n");
+       out += scnprintf(buf + out, len - out, "\n");
 
        /* Lock Resources: xxx (xxx) */
-       out += snprintf(buf + out, len - out,
+       out += scnprintf(buf + out, len - out,
                        "Lock Resources: %d (%d)\n",
                        atomic_read(&dlm->res_cur_count),
                        atomic_read(&dlm->res_tot_count));
@@ -729,29 +729,29 @@ static int debug_state_print(struct dlm_ctxt *dlm, char *buf, int len)
                cur_mles += atomic_read(&dlm->mle_cur_count[i]);
 
        /* MLEs: xxx (xxx) */
-       out += snprintf(buf + out, len - out,
+       out += scnprintf(buf + out, len - out,
                        "MLEs: %d (%d)\n", cur_mles, tot_mles);
 
        /*  Blocking: xxx (xxx) */
-       out += snprintf(buf + out, len - out,
+       out += scnprintf(buf + out, len - out,
                        "  Blocking: %d (%d)\n",
                        atomic_read(&dlm->mle_cur_count[DLM_MLE_BLOCK]),
                        atomic_read(&dlm->mle_tot_count[DLM_MLE_BLOCK]));
 
        /*  Mastery: xxx (xxx) */
-       out += snprintf(buf + out, len - out,
+       out += scnprintf(buf + out, len - out,
                        "  Mastery: %d (%d)\n",
                        atomic_read(&dlm->mle_cur_count[DLM_MLE_MASTER]),
                        atomic_read(&dlm->mle_tot_count[DLM_MLE_MASTER]));
 
        /*  Migration: xxx (xxx) */
-       out += snprintf(buf + out, len - out,
+       out += scnprintf(buf + out, len - out,
                        "  Migration: %d (%d)\n",
                        atomic_read(&dlm->mle_cur_count[DLM_MLE_MIGRATION]),
                        atomic_read(&dlm->mle_tot_count[DLM_MLE_MIGRATION]));
 
        /* Lists: Dirty=Empty  Purge=InUse  PendingASTs=Empty  ... */
-       out += snprintf(buf + out, len - out,
+       out += scnprintf(buf + out, len - out,
                        "Lists: Dirty=%s  Purge=%s  PendingASTs=%s  "
                        "PendingBASTs=%s\n",
                        (list_empty(&dlm->dirty_list) ? "Empty" : "InUse"),
@@ -760,12 +760,12 @@ static int debug_state_print(struct dlm_ctxt *dlm, char *buf, int len)
                        (list_empty(&dlm->pending_basts) ? "Empty" : "InUse"));
 
        /* Purge Count: xxx  Refs: xxx */
-       out += snprintf(buf + out, len - out,
+       out += scnprintf(buf + out, len - out,
                        "Purge Count: %d  Refs: %d\n", dlm->purge_count,
                        kref_read(&dlm->dlm_refs));
 
        /* Dead Node: xxx */
-       out += snprintf(buf + out, len - out,
+       out += scnprintf(buf + out, len - out,
                        "Dead Node: %d\n", dlm->reco.dead_node);
 
        /* What about DLM_RECO_STATE_FINALIZE? */
@@ -775,19 +775,19 @@ static int debug_state_print(struct dlm_ctxt *dlm, char *buf, int len)
                state = "INACTIVE";
 
        /* Recovery Pid: xxxx  Master: xxx  State: xxxx */
-       out += snprintf(buf + out, len - out,
+       out += scnprintf(buf + out, len - out,
                        "Recovery Pid: %d  Master: %d  State: %s\n",
                        task_pid_nr(dlm->dlm_reco_thread_task),
                        dlm->reco.new_master, state);
 
        /* Recovery Map: xx xx */
-       out += snprintf(buf + out, len - out, "Recovery Map: ");
+       out += scnprintf(buf + out, len - out, "Recovery Map: ");
        out += stringify_nodemap(dlm->recovery_map, O2NM_MAX_NODES,
                                 buf + out, len - out);
-       out += snprintf(buf + out, len - out, "\n");
+       out += scnprintf(buf + out, len - out, "\n");
 
        /* Recovery Node State: */
-       out += snprintf(buf + out, len - out, "Recovery Node State:\n");
+       out += scnprintf(buf + out, len - out, "Recovery Node State:\n");
        list_for_each_entry(node, &dlm->reco.node_data, list) {
                switch (node->state) {
                case DLM_RECO_NODE_DATA_INIT:
@@ -815,7 +815,7 @@ static int debug_state_print(struct dlm_ctxt *dlm, char *buf, int len)
                        state = "BAD";
                        break;
                }
-               out += snprintf(buf + out, len - out, "\t%u - %s\n",
+               out += scnprintf(buf + out, len - out, "\t%u - %s\n",
                                node->node_num, state);
        }
 

diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index 05dd68a..ac61eea 100644 (file)
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -220,31 +220,31 @@ static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len)
        int i, out = 0;
        unsigned long flags;
 
-       out += snprintf(buf + out, len - out,
+       out += scnprintf(buf + out, len - out,
                        "%10s => Id: %-s  Uuid: %-s  Gen: 0x%X  Label: %-s\n",
                        "Device", osb->dev_str, osb->uuid_str,
                        osb->fs_generation, osb->vol_label);
 
-       out += snprintf(buf + out, len - out,
+       out += scnprintf(buf + out, len - out,
                        "%10s => State: %d  Flags: 0x%lX\n", "Volume",
                        atomic_read(&osb->vol_state), osb->osb_flags);
 
-       out += snprintf(buf + out, len - out,
+       out += scnprintf(buf + out, len - out,
                        "%10s => Block: %lu  Cluster: %d\n", "Sizes",
                        osb->sb->s_blocksize, osb->s_clustersize);
 
-       out += snprintf(buf + out, len - out,
+       out += scnprintf(buf + out, len - out,
                        "%10s => Compat: 0x%X  Incompat: 0x%X  "
                        "ROcompat: 0x%X\n",
                        "Features", osb->s_feature_compat,
                        osb->s_feature_incompat, osb->s_feature_ro_compat);
 
-       out += snprintf(buf + out, len - out,
+       out += scnprintf(buf + out, len - out,
                        "%10s => Opts: 0x%lX  AtimeQuanta: %u\n", "Mount",
                        osb->s_mount_opt, osb->s_atime_quantum);
 
        if (cconn) {
-               out += snprintf(buf + out, len - out,
+               out += scnprintf(buf + out, len - out,
                                "%10s => Stack: %s  Name: %*s  "
                                "Version: %d.%d\n", "Cluster",
                                (*osb->osb_cluster_stack == '\0' ?
@@ -255,7 +255,7 @@ static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len)
        }
 
        spin_lock_irqsave(&osb->dc_task_lock, flags);
-       out += snprintf(buf + out, len - out,
+       out += scnprintf(buf + out, len - out,
                        "%10s => Pid: %d  Count: %lu  WakeSeq: %lu  "
                        "WorkSeq: %lu\n", "DownCnvt",
                        (osb->dc_task ?  task_pid_nr(osb->dc_task) : -1),
@@ -264,32 +264,32 @@ static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len)
        spin_unlock_irqrestore(&osb->dc_task_lock, flags);
 
        spin_lock(&osb->osb_lock);
-       out += snprintf(buf + out, len - out, "%10s => Pid: %d  Nodes:",
+       out += scnprintf(buf + out, len - out, "%10s => Pid: %d  Nodes:",
                        "Recovery",
                        (osb->recovery_thread_task ?
                         task_pid_nr(osb->recovery_thread_task) : -1));
        if (rm->rm_used == 0)
-               out += snprintf(buf + out, len - out, " None\n");
+               out += scnprintf(buf + out, len - out, " None\n");
        else {
                for (i = 0; i < rm->rm_used; i++)
-                       out += snprintf(buf + out, len - out, " %d",
+                       out += scnprintf(buf + out, len - out, " %d",
                                        rm->rm_entries[i]);
-               out += snprintf(buf + out, len - out, "\n");
+               out += scnprintf(buf + out, len - out, "\n");
        }
        spin_unlock(&osb->osb_lock);
 
-       out += snprintf(buf + out, len - out,
+       out += scnprintf(buf + out, len - out,
                        "%10s => Pid: %d  Interval: %lu\n", "Commit",
                        (osb->commit_task ? task_pid_nr(osb->commit_task) : -1),
                        osb->osb_commit_interval);
 
-       out += snprintf(buf + out, len - out,
+       out += scnprintf(buf + out, len - out,
                        "%10s => State: %d  TxnId: %lu  NumTxns: %d\n",
                        "Journal", osb->journal->j_state,
                        osb->journal->j_trans_id,
                        atomic_read(&osb->journal->j_num_trans));
 
-       out += snprintf(buf + out, len - out,
+       out += scnprintf(buf + out, len - out,
                        "%10s => GlobalAllocs: %d  LocalAllocs: %d  "
                        "SubAllocs: %d  LAWinMoves: %d  SAExtends: %d\n",
                        "Stats",
@@ -299,7 +299,7 @@ static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len)
                        atomic_read(&osb->alloc_stats.moves),
                        atomic_read(&osb->alloc_stats.bg_extends));
 
-       out += snprintf(buf + out, len - out,
+       out += scnprintf(buf + out, len - out,
                        "%10s => State: %u  Descriptor: %llu  Size: %u bits  "
                        "Default: %u bits\n",
                        "LocalAlloc", osb->local_alloc_state,
@@ -307,7 +307,7 @@ static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len)
                        osb->local_alloc_bits, osb->local_alloc_default_bits);
 
        spin_lock(&osb->osb_lock);
-       out += snprintf(buf + out, len - out,
+       out += scnprintf(buf + out, len - out,
                        "%10s => InodeSlot: %d  StolenInodes: %d, "
                        "MetaSlot: %d  StolenMeta: %d\n", "Steal",
                        osb->s_inode_steal_slot,
@@ -316,20 +316,20 @@ static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len)
                        atomic_read(&osb->s_num_meta_stolen));
        spin_unlock(&osb->osb_lock);
 
-       out += snprintf(buf + out, len - out, "OrphanScan => ");
-       out += snprintf(buf + out, len - out, "Local: %u  Global: %u ",
+       out += scnprintf(buf + out, len - out, "OrphanScan => ");
+       out += scnprintf(buf + out, len - out, "Local: %u  Global: %u ",
                        os->os_count, os->os_seqno);
-       out += snprintf(buf + out, len - out, " Last Scan: ");
+       out += scnprintf(buf + out, len - out, " Last Scan: ");
        if (atomic_read(&os->os_state) == ORPHAN_SCAN_INACTIVE)
-               out += snprintf(buf + out, len - out, "Disabled\n");
+               out += scnprintf(buf + out, len - out, "Disabled\n");
        else
-               out += snprintf(buf + out, len - out, "%lu seconds ago\n",
+               out += scnprintf(buf + out, len - out, "%lu seconds ago\n",
                                (unsigned long)(ktime_get_seconds() - os->os_scantime));
 
-       out += snprintf(buf + out, len - out, "%10s => %3s  %10s\n",
+       out += scnprintf(buf + out, len - out, "%10s => %3s  %10s\n",
                        "Slots", "Num", "RecoGen");
        for (i = 0; i < osb->max_slots; ++i) {
-               out += snprintf(buf + out, len - out,
+               out += scnprintf(buf + out, len - out,
                                "%10s  %c %3d  %10d\n",
                                " ",
                                (i == osb->slot_num ? '*' : ' '),