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dm integrity: allow unaligned bv_offset
When slub_debug is enabled kmalloc returns unaligned memory. XFS uses
this unaligned memory for its buffers (if an unaligned buffer crosses a
page, XFS frees it and allocates a full page instead - see the function
xfs_buf_allocate_memory).
dm-integrity checks if bv_offset is aligned on page size and this check
fail with slub_debug and XFS.
Fix this bug by removing the bv_offset check, leaving only the check for
bv_len.
Fixes: 7eada909bf
("dm: add integrity target")
Cc: stable@vger.kernel.org # v4.12+
Reported-by: Bruno Prémont <bonbons@sysophe.eu>
Reviewed-by: Milan Broz <gmazyland@gmail.com>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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@ -1376,7 +1376,7 @@ static int dm_integrity_map(struct dm_target *ti, struct bio *bio)
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struct bvec_iter iter;
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struct bio_vec bv;
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bio_for_each_segment(bv, bio, iter) {
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if (unlikely((bv.bv_offset | bv.bv_len) & ((ic->sectors_per_block << SECTOR_SHIFT) - 1))) {
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if (unlikely(bv.bv_len & ((ic->sectors_per_block << SECTOR_SHIFT) - 1))) {
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DMERR("Bio vector (%u,%u) is not aligned on %u-sector boundary",
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bv.bv_offset, bv.bv_len, ic->sectors_per_block);
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return DM_MAPIO_KILL;
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