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| author | Lukas Czerner | 2015-10-18 04:57:06 +0200 |
|---|---|---|
| committer | Theodore Ts'o | 2015-10-18 04:57:06 +0200 |
| commit | 6934da9238da947628be83635e365df41064b09b (patch) | |
| tree | a7d5770b2fbd3961c40b6bb2da86873dcfab19c0 /fs/ext4/ext4_jbd2.c | |
| parent | jbd2: fix checkpoint list cleanup (diff) | |
| download | kernel-qcow2-linux-6934da9238da947628be83635e365df41064b09b.tar.gz kernel-qcow2-linux-6934da9238da947628be83635e365df41064b09b.tar.xz kernel-qcow2-linux-6934da9238da947628be83635e365df41064b09b.zip | |
ext4: fix potential use after free in __ext4_journal_stop
There is a use-after-free possibility in __ext4_journal_stop() in the
case that we free the handle in the first jbd2_journal_stop() because
we're referencing handle->h_err afterwards. This was introduced in
9705acd63b125dee8b15c705216d7186daea4625 and it is wrong. Fix it by
storing the handle->h_err value beforehand and avoid referencing
potentially freed handle.
Fixes: 9705acd63b125dee8b15c705216d7186daea4625
Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Reviewed-by: Andreas Dilger <adilger@dilger.ca>
Cc: stable@vger.kernel.org
Diffstat (limited to 'fs/ext4/ext4_jbd2.c')
| -rw-r--r-- | fs/ext4/ext4_jbd2.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/ext4/ext4_jbd2.c b/fs/ext4/ext4_jbd2.c index d41843181818..e770c1ee4613 100644 --- a/fs/ext4/ext4_jbd2.c +++ b/fs/ext4/ext4_jbd2.c @@ -88,13 +88,13 @@ int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle) return 0; } + err = handle->h_err; if (!handle->h_transaction) { - err = jbd2_journal_stop(handle); - return handle->h_err ? handle->h_err : err; + rc = jbd2_journal_stop(handle); + return err ? err : rc; } sb = handle->h_transaction->t_journal->j_private; - err = handle->h_err; rc = jbd2_journal_stop(handle); if (!err) |