diff options
| author | Xiubo Li <xiubli@redhat.com> | 2022-04-14 09:07:21 +0800 |
|---|---|---|
| committer | Ilya Dryomov <idryomov@gmail.com> | 2022-04-25 10:45:50 +0200 |
| commit | 7acae6183cf37c48b8da48bbbdb78820fb3913f3 (patch) | |
| tree | 41bd700e9a1187773a5c10d2377b46fb4aca824c /fs/ceph/caps.c | |
| parent | 396ea1681892211dd3fbc1a58bfc2c2c971433e3 (diff) | |
ceph: fix possible NULL pointer dereference for req->r_session
The request will be inserted into the ci->i_unsafe_dirops before
assigning the req->r_session, so it's possible that we will hit
NULL pointer dereference bug here.
Cc: stable@vger.kernel.org
URL: https://tracker.ceph.com/issues/55327
Signed-off-by: Xiubo Li <xiubli@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Tested-by: Aaron Tomlin <atomlin@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Diffstat (limited to 'fs/ceph/caps.c')
| -rw-r--r-- | fs/ceph/caps.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c index 31204cdc2fbf..5c14ef04e474 100644 --- a/fs/ceph/caps.c +++ b/fs/ceph/caps.c @@ -2274,6 +2274,8 @@ retry: list_for_each_entry(req, &ci->i_unsafe_dirops, r_unsafe_dir_item) { s = req->r_session; + if (!s) + continue; if (unlikely(s->s_mds >= max_sessions)) { spin_unlock(&ci->i_unsafe_lock); for (i = 0; i < max_sessions; i++) { @@ -2294,6 +2296,8 @@ retry: list_for_each_entry(req, &ci->i_unsafe_iops, r_unsafe_target_item) { s = req->r_session; + if (!s) + continue; if (unlikely(s->s_mds >= max_sessions)) { spin_unlock(&ci->i_unsafe_lock); for (i = 0; i < max_sessions; i++) { |