diff options
| author | Tuo Li <islituo@gmail.com> | 2021-08-05 08:14:34 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-09-08 08:49:01 +0200 |
| commit | 23c29490b84dd89582b7d3233e97f73c41f1a065 (patch) | |
| tree | 5c98681a6eb36ad579f2c8267b1a87c041a32b47 /fs | |
| parent | d2064a1444d67875c2b4ff1ee5dd55d7abee6bff (diff) | |
ceph: fix possible null-pointer dereference in ceph_mdsmap_decode()
[ Upstream commit a9e6ffbc5b7324b6639ee89028908b1e91ceed51 ]
kcalloc() is called to allocate memory for m->m_info, and if it fails,
ceph_mdsmap_destroy() behind the label out_err will be called:
ceph_mdsmap_destroy(m);
In ceph_mdsmap_destroy(), m->m_info is dereferenced through:
kfree(m->m_info[i].export_targets);
To fix this possible null-pointer dereference, check m->m_info before the
for loop to free m->m_info[i].export_targets.
[ jlayton: fix up whitespace damage
only kfree(m->m_info) if it's non-NULL ]
Reported-by: TOTE Robot <oslab@tsinghua.edu.cn>
Signed-off-by: Tuo Li <islituo@gmail.com>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/ceph/mdsmap.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/fs/ceph/mdsmap.c b/fs/ceph/mdsmap.c index 1096d1d3a84c..47f2903bacb9 100644 --- a/fs/ceph/mdsmap.c +++ b/fs/ceph/mdsmap.c @@ -393,9 +393,11 @@ void ceph_mdsmap_destroy(struct ceph_mdsmap *m) { int i; - for (i = 0; i < m->possible_max_rank; i++) - kfree(m->m_info[i].export_targets); - kfree(m->m_info); + if (m->m_info) { + for (i = 0; i < m->possible_max_rank; i++) + kfree(m->m_info[i].export_targets); + kfree(m->m_info); + } kfree(m->m_data_pg_pools); kfree(m); } |