linux-kernel - [PATCH 4.19 002/131] block/bio-integrity: don't free 'buf' if bio_integrity_add

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Message-Id: <20200629153502.2494656-3-sashal@kernel.org>
Date:   Mon, 29 Jun 2020 11:32:53 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     yu kuai <yukuai3@...wei.com>, Ming Lei <ming.lei@...hat.com>,
        Bob Liu <bob.liu@...cle.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Jens Axboe <axboe@...nel.dk>,
        Guenter Roeck <linux@...ck-us.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH 4.19 002/131] block/bio-integrity: don't free 'buf' if bio_integrity_add_page() failed

From: yu kuai <yukuai3@...wei.com>

commit a75ca9303175d36af93c0937dd9b1a6422908b8d upstream.

commit e7bf90e5afe3 ("block/bio-integrity: fix a memory leak bug") added
a kfree() for 'buf' if bio_integrity_add_page() returns '0'. However,
the object will be freed in bio_integrity_free() since 'bio->bi_opf' and
'bio->bi_integrity' were set previousy in bio_integrity_alloc().

Fixes: commit e7bf90e5afe3 ("block/bio-integrity: fix a memory leak bug")
Signed-off-by: yu kuai <yukuai3@...wei.com>
Reviewed-by: Ming Lei <ming.lei@...hat.com>
Reviewed-by: Bob Liu <bob.liu@...cle.com>
Acked-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Cc: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 block/bio-integrity.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/block/bio-integrity.c b/block/bio-integrity.c
index 5bd90cd4b51e3..a059fad53f1b0 100644
--- a/block/bio-integrity.c
+++ b/block/bio-integrity.c
@@ -293,7 +293,6 @@ bool bio_integrity_prep(struct bio *bio)
 
 		if (ret == 0) {
 			printk(KERN_ERR "could not attach integrity payload\n");
-			kfree(buf);
 			status = BLK_STS_RESOURCE;
 			goto err_end_io;
 		}
-- 
2.25.1