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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
9705acd63b and it is wrong. Fix it by
storing the handle->h_err value beforehand and avoid referencing
potentially freed handle.

Fixes: 9705acd63b
Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Reviewed-by: Andreas Dilger <adilger@dilger.ca>
Cc: stable@vger.kernel.org
This commit is contained in:
Lukas Czerner 2015-10-17 22:57:06 -04:00 committed by Theodore Ts'o
parent 33d14975e5
commit 6934da9238
1 changed files with 3 additions and 3 deletions
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6
fs/ext4/ext4_jbd2.c
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@ -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)