Trim bio to sensible size in bio_trim() or something bad may happen. Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx> --- block/bio.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/block/bio.c b/block/bio.c index a9931f23d933..94e4f97d3d4e 100644 --- a/block/bio.c +++ b/block/bio.c @@ -1509,7 +1509,8 @@ void bio_trim(struct bio *bio, int offset, int size) return; bio_advance(bio, offset << 9); - bio->bi_iter.bi_size = size; + if (likely(bio->bi_iter.bi_size >= size)) + bio->bi_iter.bi_size = size; if (bio_integrity(bio)) bio_integrity_trim(bio); -- 2.19.1
