Mikulas Patocka ba751f0d25 dm mirror log: round up region bitmap size to BITS_PER_LONG
commit 85e123c27d5cbc22cfdc01de1e2ca1d9003a02d0 upstream.

The code in dm-log rounds up bitset_size to 32 bits. It then uses
find_next_zero_bit_le on the allocated region. find_next_zero_bit_le
accesses the bitmap using unsigned long pointers. So, on 64-bit
architectures, it may access 4 bytes beyond the allocated size.

Fix this bug by rounding up bitset_size to BITS_PER_LONG.

This bug was found by running the lvm2 testsuite with kasan.

Fixes: 29121bd0b00e ("[PATCH] dm mirror log: bitset_size fix")
Cc: stable@vger.kernel.org
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-06-22 14:13:19 +02:00
..
2019-11-12 19:12:07 -07:00
2020-07-08 17:20:46 -06:00
2021-01-27 11:54:57 +01:00
2022-01-16 09:14:21 +01:00
2022-06-06 08:42:44 +02:00