ceph: fix off by one bugs in unsafe_request_wait()

The "> max" tests should be ">= max" to prevent an out of bounds access
on the next lines.

Fixes: e1a4541ec0b9 ("ceph: flush the mdlog before waiting on unsafe reqs")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 6c0e52f..3e42d04 100644 (file)
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -2263,7 +2263,7 @@ retry:
                        list_for_each_entry(req, &ci->i_unsafe_dirops,
                                            r_unsafe_dir_item) {
                                s = req->r_session;
-                               if (unlikely(s->s_mds > max)) {
+                               if (unlikely(s->s_mds >= max)) {
                                        spin_unlock(&ci->i_unsafe_lock);
                                        goto retry;
                                }
@@ -2277,7 +2277,7 @@ retry:
                        list_for_each_entry(req, &ci->i_unsafe_iops,
                                            r_unsafe_target_item) {
                                s = req->r_session;
-                               if (unlikely(s->s_mds > max)) {
+                               if (unlikely(s->s_mds >= max)) {
                                        spin_unlock(&ci->i_unsafe_lock);
                                        goto retry;
                                }