linux-kernel - [PATCH 3/3] mm/shmem.c: check the return value of mpol_to

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Message-ID: <521424FA.5000203@asianux.com>
Date:	Wed, 21 Aug 2013 10:24:58 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Mel Gorman <mgorman@...e.de>, kosaki.motohiro@...fujitsu.com,
	riel@...hat.com, hughd@...gle.com, xemul@...allels.com,
	rientjes@...gle.com, Wanpeng Li <liwanp@...ux.vnet.ibm.com>
CC:	Cyrill Gorcunov <gorcunov@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH 3/3] mm/shmem.c: check the return value of mpol_to_str()

mpol_to_str() may fail, and not fill the buffer (e.g. -EINVAL), so need
check about it, or buffer may not be zero based, and next seq_printf()
will cause issue.


Signed-off-by: Chen Gang <gang.chen@...anux.com>
Cc: Cyrill Gorcunov <gorcunov@...il.com>
---
 mm/shmem.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/mm/shmem.c b/mm/shmem.c
index e59d332..ae5112f 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -886,11 +886,14 @@ redirty:
 static int shmem_show_mpol(struct seq_file *seq, struct mempolicy *mpol)
 {
 	char buffer[64];
+	int ret;
 
 	if (!mpol || mpol->mode == MPOL_DEFAULT)
 		return 0;		/* show nothing */
 
-	mpol_to_str(buffer, sizeof(buffer), mpol);
+	ret = mpol_to_str(buffer, sizeof(buffer), mpol);
+	if (ret < 0)
+		return ret;
 
 	seq_printf(seq, ",mpol=%s", buffer);
 	return 0;
-- 
1.7.7.6
--
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