linux-kernel - [PATCH] memcg: Use scnprintf instead of sprintf

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Date:	Wed, 18 Apr 2012 11:45:56 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	linux-mm@...ck.org, mgorman@...e.de,
	kamezawa.hiroyu@...fujitsu.com, dhillf@...il.com,
	aarcange@...hat.com, mhocko@...e.cz, akpm@...ux-foundation.org,
	hannes@...xchg.org
Cc:	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Subject: [PATCH] memcg: Use scnprintf instead of sprintf

From: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>

This make sure we don't overflow.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
---
 mm/memcontrol.c |   14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 519d370..0ccf934 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5269,14 +5269,14 @@ static void mem_cgroup_destroy(struct cgroup *cont)
 }
 
 #ifdef CONFIG_MEM_RES_CTLR_HUGETLB
-static char *mem_fmt(char *buf, unsigned long n)
+static char *mem_fmt(char *buf, int size, unsigned long hsize)
 {
-	if (n >= (1UL << 30))
-		sprintf(buf, "%luGB", n >> 30);
-	else if (n >= (1UL << 20))
-		sprintf(buf, "%luMB", n >> 20);
+	if (hsize >= (1UL << 30))
+		scnprintf(buf, size, "%luGB", hsize >> 30);
+	else if (hsize >= (1UL << 20))
+		scnprintf(buf, size, "%luMB", hsize >> 20);
 	else
-		sprintf(buf, "%luKB", n >> 10);
+		scnprintf(buf, size, "%luKB", hsize >> 10);
 	return buf;
 }
 
@@ -5287,7 +5287,7 @@ int __init mem_cgroup_hugetlb_file_init(int idx)
 	struct hstate *h = &hstates[idx];
 
 	/* format the size */
-	mem_fmt(buf, huge_page_size(h));
+	mem_fmt(buf, 32, huge_page_size(h));
 
 	/* Add the limit file */
 	cft = &h->mem_cgroup_files[0];
-- 
1.7.10

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