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block: prevent an integer overflow in bvec_try_merge_hw_page
Reordered a check to avoid a possible overflow when adding len to bv_len. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Link: https://lore.kernel.org/r/20231204173419.782378-2-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
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@ -944,7 +944,7 @@ bool bvec_try_merge_hw_page(struct request_queue *q, struct bio_vec *bv,
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if ((addr1 | mask) != (addr2 | mask))
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return false;
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if (bv->bv_len + len > queue_max_segment_size(q))
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if (len > queue_max_segment_size(q) - bv->bv_len)
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return false;
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return bvec_try_merge_page(bv, page, len, offset, same_page);
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}
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