linux-kernel - [PATCH v4] block: Fix uninitialized symbol 'bio' in blk_rq_prep

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Message-Id: <20241008175215.23975-1-surajsonawane0215@gmail.com>
Date: Tue,  8 Oct 2024 23:22:15 +0530
From: SurajSonawane2415 <surajsonawane0215@...il.com>
To: surajsonawane0215@...il.com,
	axboe@...nel.dk
Cc: linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	hch@...radead.org
Subject: [PATCH v4] block: Fix uninitialized symbol 'bio' in blk_rq_prep_clone

Fix the uninitialized symbol 'bio' in the function blk_rq_prep_clone
to resolve the following error:
block/blk-mq.c:3199 blk_rq_prep_clone() error: uninitialized symbol 'bio'.

Signed-off-by: SurajSonawane2415 <surajsonawane0215@...il.com>
---
V1 - Initialize 'bio' to NULL.
V2 - Move bio_put(bio) into the bio_ctr error handling block,
ensuring memory cleanup occurs only when the bio_ctr fail.
V3 - Moved the bio declaration into the loop scope, eliminating
the need to set it to NULL at the end of the loop.
V4 - Adjusted position of arguments of bio_alloc_clone.

 block/blk-mq.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 4b2c8e940..89c9a6c4d 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -3156,19 +3156,21 @@ int blk_rq_prep_clone(struct request *rq, struct request *rq_src,
 		      int (*bio_ctr)(struct bio *, struct bio *, void *),
 		      void *data)
 {
-	struct bio *bio, *bio_src;
+	struct bio *bio_src;
 
 	if (!bs)
 		bs = &fs_bio_set;
 
 	__rq_for_each_bio(bio_src, rq_src) {
-		bio = bio_alloc_clone(rq->q->disk->part0, bio_src, gfp_mask,
-				      bs);
+		struct bio *bio = bio_alloc_clone(rq->q->disk->part0, bio_src,
+					gfp_mask, bs);
 		if (!bio)
 			goto free_and_out;
 
-		if (bio_ctr && bio_ctr(bio, bio_src, data))
+		if (bio_ctr && bio_ctr(bio, bio_src, data)) {
+			bio_put(bio);
 			goto free_and_out;
+		}
 
 		if (rq->bio) {
 			rq->biotail->bi_next = bio;
@@ -3176,7 +3178,6 @@ int blk_rq_prep_clone(struct request *rq, struct request *rq_src,
 		} else {
 			rq->bio = rq->biotail = bio;
 		}
-		bio = NULL;
 	}
 
 	/* Copy attributes of the original request to the clone request. */
@@ -3196,8 +3197,6 @@ int blk_rq_prep_clone(struct request *rq, struct request *rq_src,
 	return 0;
 
 free_and_out:
-	if (bio)
-		bio_put(bio);
 	blk_rq_unprep_clone(rq);
 
 	return -ENOMEM;
-- 
2.34.1