summaryrefslogtreecommitdiffstats
path: root/fs
diff options
context:
space:
mode:
authorLukas Czerner <lczerner@redhat.com>2015-10-17 22:57:06 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-05-20 14:18:43 +0200
commita4896e11679432f30433f415a5f31d5ebbbf8b66 (patch)
treebaaf97db2ad51df52b33a62d44dc410a5c3fba01 /fs
parent7da78079bae82dbaac4b88e0cb1f875e0dc52775 (diff)
downloadlinux-stable-a4896e11679432f30433f415a5f31d5ebbbf8b66.tar.gz
linux-stable-a4896e11679432f30433f415a5f31d5ebbbf8b66.tar.bz2
linux-stable-a4896e11679432f30433f415a5f31d5ebbbf8b66.zip
ext4: fix potential use after free in __ext4_journal_stop
commit 6934da9238da947628be83635e365df41064b09b upstream. 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> Signed-off-by: Amit Pundir <amit.pundir@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/ext4/ext4_jbd2.c6
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)