linux-kernel - [PATCH] mm/backing-dev.c: fix an error handling path in 'cgwb

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Message-Id: <20170911194323.17833-1-christophe.jaillet@wanadoo.fr>
Date:   Mon, 11 Sep 2017 21:43:23 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     axboe@...com, jack@...e.cz, tj@...nel.org, geliangtang@...il.com,
        akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH] mm/backing-dev.c: fix an error handling path in 'cgwb_create()'

If the 'kmalloc' fails, we must go through the existing error handling
path.

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 mm/backing-dev.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index f028a9a472fd..e19606bb41a0 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -569,8 +569,10 @@ static int cgwb_create(struct backing_dev_info *bdi,
 
 	/* need to create a new one */
 	wb = kmalloc(sizeof(*wb), gfp);
-	if (!wb)
-		return -ENOMEM;
+	if (!wb) {
+		ret = -ENOMEM;
+		goto out_put;
+	}
 
 	ret = wb_init(wb, bdi, blkcg_css->id, gfp);
 	if (ret)
-- 
2.11.0