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| author | Christoph Hellwig <hch@lst.de> | 2023-12-04 18:34:18 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2023-12-15 15:34:27 +0100 |
| commit | 3f034c374ad55773c12dd8f3c1607328e17c0072 (patch) | |
| tree | 63d40bdc2f1ccf202c00d9edf11aeeb207943179 | |
| parent | block: Use pr_info() instead of printk(KERN_INFO ...) (diff) | |
| download | linux-3f034c374ad55773c12dd8f3c1607328e17c0072.tar.xz linux-3f034c374ad55773c12dd8f3c1607328e17c0072.zip | |
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>
| -rw-r--r-- | block/bio.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/block/bio.c b/block/bio.c index 5eba53ca953b..270f6b99926e 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); } |