make dump_common_audit_data() safe to be called from RCU pathwalk

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/security/lsm_audit.c b/security/lsm_audit.c
index a0cd28c..82ce149 100644 (file)
--- a/security/lsm_audit.c
+++ b/security/lsm_audit.c
@@ -291,18 +291,19 @@ static void dump_common_audit_data(struct audit_buffer *ab,
                struct dentry *dentry;
                struct inode *inode;
 
+               rcu_read_lock();
                inode = a->u.inode;
-               dentry = d_find_alias(inode);
+               dentry = d_find_alias_rcu(inode);
                if (dentry) {
                        audit_log_format(ab, " name=");
                        spin_lock(&dentry->d_lock);
                        audit_log_untrustedstring(ab, dentry->d_name.name);
                        spin_unlock(&dentry->d_lock);
-                       dput(dentry);
                }
                audit_log_format(ab, " dev=");
                audit_log_untrustedstring(ab, inode->i_sb->s_id);
                audit_log_format(ab, " ino=%lu", inode->i_ino);
+               rcu_read_unlock();
                break;
        }
        case LSM_AUDIT_DATA_TASK: {