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(parent: bc9e9cf) | patch
dm writecache: fix a crash due to reading past end of dirty_bitmap
authorMikulas Patocka <mpatocka@redhat.com>
Thu, 16 Aug 2018 16:23:19 +0000 (12:23 -0400)
committerMike Snitzer <snitzer@redhat.com>
Thu, 16 Aug 2018 17:43:01 +0000 (13:43 -0400)
commit1e1132ea21da6d7be92a72195204379c819cb70b
treeb983945975d697c37ac0193d18ca022cca4c3fb0tree | snapshot
parentbc9e9cf0401f18e33b78d4c8a518661b8346baf7commit | diff
dm writecache: fix a crash due to reading past end of dirty_bitmap

wc->dirty_bitmap_size is in bytes so must multiply it by 8, not by
BITS_PER_LONG, to get number of bitmap_bits.

Fixes crash in find_next_bit() that was reported:
https://bugzilla.kernel.org/show_bug.cgi?id=200819

Reported-by: edo.rus@gmail.com
Fixes: 48debafe4f2f ("dm: add writecache target")
Cc: stable@vger.kernel.org # 4.18
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
drivers/md/dm-writecache.c diff | blob | history
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