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Date:   Sat, 29 Aug 2020 05:37:33 -0400
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <axboe@...nel.dk>
CC:     <linux-block@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linmiaohe@...wei.com>
Subject: [PATCH] block: bio: Trim bio to sensible size in bio_trim()

Trim bio to sensible size in bio_trim() or something bad may happen.

Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
---
 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

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