diff options
author | Xiubo Li <xiubli@redhat.com> | 2022-11-09 11:00:39 +0800 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-12-08 11:23:00 +0100 |
commit | cb7495fe957526555782ce0723f79ce92a6db22e (patch) | |
tree | 0cdef5f10a725cc970d457315ff7e2d22535768b | |
parent | 12a93545b2ed94caf85dd78c5537fcc5cd1596e1 (diff) |
ceph: avoid putting the realm twice when decoding snaps fails
[ Upstream commit 51884d153f7ec85e18d607b2467820a90e0f4359 ]
When decoding the snaps fails it maybe leaving the 'first_realm'
and 'realm' pointing to the same snaprealm memory. And then it'll
put it twice and could cause random use-after-free, BUG_ON, etc
issues.
Cc: stable@vger.kernel.org
Link: https://tracker.ceph.com/issues/57686
Signed-off-by: Xiubo Li <xiubli@redhat.com>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
-rw-r--r-- | fs/ceph/snap.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/ceph/snap.c b/fs/ceph/snap.c index f2731f9efc31..97ce1bd13bad 100644 --- a/fs/ceph/snap.c +++ b/fs/ceph/snap.c @@ -694,7 +694,7 @@ int ceph_update_snap_trace(struct ceph_mds_client *mdsc, struct ceph_mds_snap_realm *ri; /* encoded */ __le64 *snaps; /* encoded */ __le64 *prior_parent_snaps; /* encoded */ - struct ceph_snap_realm *realm = NULL; + struct ceph_snap_realm *realm; struct ceph_snap_realm *first_realm = NULL; struct ceph_snap_realm *realm_to_rebuild = NULL; int rebuild_snapcs; @@ -705,6 +705,7 @@ int ceph_update_snap_trace(struct ceph_mds_client *mdsc, dout("update_snap_trace deletion=%d\n", deletion); more: + realm = NULL; rebuild_snapcs = 0; ceph_decode_need(&p, e, sizeof(*ri), bad); ri = p; |