1 files changed, 2 insertions, 3 deletions

diff --git a/net/core/utils.c b/net/core/utils.c
index e3487e461939..3c7f5b51b979 100644
--- a/net/core/utils.c
+++ b/net/core/utils.c
@@ -17,6 +17,7 @@
 #include <linux/module.h>
 #include <linux/jiffies.h>
 #include <linux/kernel.h>
+#include <linux/ctype.h>
 #include <linux/inet.h>
 #include <linux/mm.h>
 #include <linux/net.h>
@@ -348,9 +349,7 @@ int mac_pton(const char *s, u8 *mac)
 
         /* Don't dirty result unless string is valid MAC. */
         for (i = 0; i < ETH_ALEN; i++) {
-                if (!strchr("0123456789abcdefABCDEF", s[i * 3]))
-                        return 0;
-                if (!strchr("0123456789abcdefABCDEF", s[i * 3 + 1]))
+                if (!isxdigit(s[i * 3]) || !isxdigit(s[i * 3 + 1]))
                         return 0;
                 if (i != ETH_ALEN - 1 && s[i * 3 + 2] != ':')
                         return 0;