linux-kernel - [PATCH 5.10 104/105] block: fix memory leak of bvec

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Date:   Wed, 27 Jul 2022 18:11:30 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Johannes Thumshirn <johannes.thumshirn@....com>,
        Chaitanya Kulkarni <chaitanya.kulkarni@....com>,
        Damien Le Moal <damien.lemoal@....com>,
        Christoph Hellwig <hch@....de>, Ming Lei <ming.lei@...hat.com>,
        Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 5.10 104/105] block: fix memory leak of bvec

From: Ming Lei <ming.lei@...hat.com>

commit 8358c28a5d44bf0223a55a2334086c3707bb4185 upstream.

bio_init() clears bio instance, so the bvec index has to be set after
bio_init(), otherwise bio->bi_io_vec may be leaked.

Fixes: 3175199ab0ac ("block: split bio_kmalloc from bio_alloc_bioset")
Cc: Johannes Thumshirn <johannes.thumshirn@....com>
Cc: Chaitanya Kulkarni <chaitanya.kulkarni@....com>
Cc: Damien Le Moal <damien.lemoal@....com>
Reviewed-by: Christoph Hellwig <hch@....de>
Signed-off-by: Ming Lei <ming.lei@...hat.com>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 block/bio.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/block/bio.c
+++ b/block/bio.c
@@ -491,8 +491,8 @@ struct bio *bio_alloc_bioset(gfp_t gfp_m
 		if (unlikely(!bvl))
 			goto err_free;
 
-		bio->bi_flags |= idx << BVEC_POOL_OFFSET;
 		bio_init(bio, bvl, bvec_nr_vecs(idx));
+		bio->bi_flags |= idx << BVEC_POOL_OFFSET;
 	} else if (nr_iovecs) {
 		bio_init(bio, bio->bi_inline_vecs, BIO_INLINE_VECS);
 	} else {