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block: check bio split for unaligned bvec

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Offsets and lengths need to be validated against the dma alignment. This
check was skipped for sufficiently a small bio with a single bvec, which
may allow an invalid request dispatched to the driver. Force the
validation for an unaligned bvec by forcing the bio split path that
handles this condition.

Fixes: 7eac331869 ("iomap: simplify direct io validity check")
Fixes: 5ff3f74e14 ("block: simplify direct io validity check")
Reported-by: Carlos Maiolino <cem@kernel.org>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Link: https://patch.msgid.link/20260612223205.465913-1-kbusch@meta.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Keith Busch 2026-06-12 15:32:04 -07:00 committed by Jens Axboe
parent d532cddb6c
commit 9b0c3673c8
1 changed files with 2 additions and 0 deletions
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2
block/blk.h
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@ -408,6 +408,8 @@ static inline bool bio_may_need_split(struct bio *bio,
bv = __bvec_iter_bvec(bio->bi_io_vec, bio->bi_iter);
if (bio->bi_iter.bi_size > bv->bv_len - bio->bi_iter.bi_bvec_done)
return true;
if ((bv->bv_offset | bv->bv_len) & lim->dma_alignment)
return true;
return bv->bv_len + bv->bv_offset > lim->max_fast_segment_size;
}