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dm integrity: allow unaligned bv_offset

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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: 7eada909bfd7 ("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>
This commit is contained in:
Mikulas Patocka 2017-11-07 10:40:40 -05:00 committed by Mike Snitzer
parent 0440d5c0ca
commit 95b1369a96
1 changed files with 1 additions and 1 deletions
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2
drivers/md/dm-integrity.c
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@ -1376,7 +1376,7 @@ static int dm_integrity_map(struct dm_target *ti, struct bio *bio)
struct bvec_iter iter;
struct bio_vec bv;
bio_for_each_segment(bv, bio, iter) {
if (unlikely((bv.bv_offset | bv.bv_len) & ((ic->sectors_per_block << SECTOR_SHIFT) - 1))) {
if (unlikely(bv.bv_len & ((ic->sectors_per_block << SECTOR_SHIFT) - 1))) {
DMERR("Bio vector (%u,%u) is not aligned on %u-sector boundary",
bv.bv_offset, bv.bv_len, ic->sectors_per_block);
return DM_MAPIO_KILL;