AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2025-03-03 09:05:41 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity

dm writecache: fix a crash due to reading past end of dirty_bitmap

Browse Source 
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: 48debafe4f ("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>
This commit is contained in:
Mikulas Patocka 2018-08-16 12:23:19 -04:00 committed by Mike Snitzer
parent bc9e9cf040
commit 1e1132ea21
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/md/dm-writecache.c
View File

@ -457,7 +457,7 @@ static void ssd_commit_flushed(struct dm_writecache *wc)
COMPLETION_INITIALIZER_ONSTACK(endio.c),
ATOMIC_INIT(1),
};
unsigned bitmap_bits = wc->dirty_bitmap_size * BITS_PER_LONG;
unsigned bitmap_bits = wc->dirty_bitmap_size * 8;
unsigned i = 0;
while (1) {