linux-kernel - [PATCH] block: set bi

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Message-Id: <20250215-clone-bi_vcnt-v1-1-5d00c95fd53a@kernel.org>
Date: Sat, 15 Feb 2025 11:58:15 +0100
From: Andreas Hindborg <a.hindborg@...nel.org>
To: Jens Axboe <axboe@...nel.dk>
Cc: Oliver Mangold <oliver.mangold@...me>, linux-block@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Andreas Hindborg <a.hindborg@...nel.org>
Subject: [PATCH] block: set bi_vcnt when cloning bio

When cloning a bio, the `bio.bi_vcnt` field is not cloned. This is a
problem if users want to perform bounds checks on the `bio.bi_io_vec`
field.

Signed-off-by: Andreas Hindborg <a.hindborg@...nel.org>
---
 block/bio.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/block/bio.c b/block/bio.c
index f0c416e5931d9..334eedf312803 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -870,6 +870,7 @@ struct bio *bio_alloc_clone(struct block_device *bdev, struct bio *bio_src,
 		return NULL;
 	}
 	bio->bi_io_vec = bio_src->bi_io_vec;
+	bio->bi_vcnt = bio_src->bi_vcnt;
 
 	return bio;
 }

---
base-commit: a64dcfb451e254085a7daee5fe51bf22959d52d3
change-id: 20250215-clone-bi_vcnt-f3f770988894

Best regards,
-- 
Andreas Hindborg <a.hindborg@...nel.org>