[PATCH 4.14 15/37] dm snapshot: fix crash with transient storage and zero chunk size

Greg Kroah-Hartman
2021-05-24T15:43:46Z

From: Mikulas Patocka <mpatocka@redhat.com>

commit c699a0db2d62e3bbb7f0bf35c87edbc8d23e3062 upstream.

The following commands will crash the kernel:

modprobe brd rd_size=1048576
dmsetup create o --table "0 `blockdev --getsize /dev/ram0` snapshot-origin /dev/ram0"
dmsetup create s --table "0 `blockdev --getsize /dev/ram0` snapshot /dev/ram0 /dev/ram1 N 0"

The reason is that when we test for zero chunk size, we jump to the label
bad_read_metadata without setting the "r" variable. The function
snapshot_ctr destroys all the structures and then exits with "r == 0". The
kernel then crashes because it falsely believes that snapshot_ctr
succeeded.

In order to fix the bug, we set the variable "r" to -EINVAL.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/md/dm-snap.c | 1 +
1 file changed, 1 insertion(+)

--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -1285,6 +1285,7 @@ static int snapshot_ctr(struct dm_target

if (!s->store->chunk_size) {
ti->error = "Chunk size not set";
+ r = -EINVAL;
goto bad_read_metadata;
}