mqueue: fix kernel BUG caused by double free() on mq_open()

In case of aborting because we reach the maximum amount of memory which
can be allocated to message queues per user (RLIMIT_MSGQUEUE), we would
try to free the message area twice when bailing out: first by the error
handling code itself, and then later when cleaning up the inode through
delete_inode().

Signed-off-by: André Goddard Rosa <andre.goddard@gmail.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 722b0130aa94..59a009dc54a8 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -158,7 +158,7 @@ static struct inode *mqueue_get_inode(struct super_block *sb,
                             u->mq_bytes + mq_bytes >
                             task_rlimit(p, RLIMIT_MSGQUEUE)) {
                                 spin_unlock(&mq_lock);
-                                kfree(info->messages);
+                                /* mqueue_delete_inode() releases info->messages */
                                 goto out_inode;
                         }
                         u->mq_bytes += mq_bytes;