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