linux-kernel - [PATCH] cpu-topology: Fix the potential data corruption

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Message-ID: <1582878945-50415-1-git-send-email-prime.zeng@hisilicon.com>
Date:   Fri, 28 Feb 2020 16:35:45 +0800
From:   Zeng Tao <prime.zeng@...ilicon.com>
To:     <sudeep.holla@....com>
CC:     <linuxarm@...wei.com>, Zeng Tao <prime.zeng@...ilicon.com>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] cpu-topology: Fix the potential data corruption

Currently there are only 10 bytes to store the cpu-topology info.
That is:
snprintf(buffer, 10, "cluster%d",i);
snprintf(buffer, 10, "thread%d",i);
snprintf(buffer, 10, "core%d",i);

In the boundary test, if the cluster number exceeds 100, there will be a
data corrution, and the kernel will fall into dead loop. in the cluster
parse function.

So in this patch, enlarge the buffer to fix such potential issues.

Signed-off-by: Zeng Tao <prime.zeng@...ilicon.com>
---
 drivers/base/arch_topology.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
index 6119e11..f489883 100644
--- a/drivers/base/arch_topology.c
+++ b/drivers/base/arch_topology.c
@@ -281,7 +281,7 @@ static int __init get_cpu_for_node(struct device_node *node)
 static int __init parse_core(struct device_node *core, int package_id,
 			     int core_id)
 {
-	char name[10];
+	char name[20];
 	bool leaf = true;
 	int i = 0;
 	int cpu;
@@ -327,7 +327,7 @@ static int __init parse_core(struct device_node *core, int package_id,
 
 static int __init parse_cluster(struct device_node *cluster, int depth)
 {
-	char name[10];
+	char name[20];
 	bool leaf = true;
 	bool has_cores = false;
 	struct device_node *c;
-- 
2.8.1