cpuset: limit the input of cpuset.sched_relax_domain_level

We allow the inputs to be [-1 ... SD_LV_MAX), and return -EINVAL
for inputs outside this range.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Paul Menage <menage@google.com>
Acked-by: Paul Jackson <pj@sgi.com>
Acked-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

2 files changed, 8 insertions, 3 deletions

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 039baa4cd90c..66103a119bfe 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -1037,8 +1037,8 @@ int current_cpuset_is_being_rebound(void)
 
 static int update_relax_domain_level(struct cpuset *cs, s64 val)
 {
-        if ((int)val < 0)
-                val = -1;
+        if (val < -1 || val >= SD_LV_MAX)
+                return -EINVAL;
 
         if (val != cs->relax_domain_level) {
                 cs->relax_domain_level = val;
diff --git a/kernel/sched.c b/kernel/sched.c
index eaf6751e7612..bb2c699c9f5e 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -6877,7 +6877,12 @@ static int default_relax_domain_level = -1;
 
 static int __init setup_relax_domain_level(char *str)
 {
-        default_relax_domain_level = simple_strtoul(str, NULL, 0);
+        unsigned long val;
+
+        val = simple_strtoul(str, NULL, 0);
+        if (val < SD_LV_MAX)
+                default_relax_domain_level = val;
+
         return 1;
 }
 __setup("relax_domain_level=", setup_relax_domain_level);