From: Christoph Hellwig hch@lst.de
[ Upstream commit 3f034c374ad55773c12dd8f3c1607328e17c0072 ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- block/bio.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/block/bio.c b/block/bio.c index 816d412c06e9..cef830adbc06 100644 --- a/block/bio.c +++ b/block/bio.c @@ -944,7 +944,7 @@ bool bvec_try_merge_hw_page(struct request_queue *q, struct bio_vec *bv,
if ((addr1 | mask) != (addr2 | mask)) return false; - if (bv->bv_len + len > queue_max_segment_size(q)) + if (len > queue_max_segment_size(q) - bv->bv_len) return false; return bvec_try_merge_page(bv, page, len, offset, same_page); }