1 files changed, 12 insertions, 4 deletions

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 84cab0ce44d9..e0ac6cd79fcf 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1686,13 +1686,12 @@ static int _proc_do_string(void* data, int maxlen, int write,
         size_t len;
         char __user *p;
         char c;
-        
-        if (!data || !maxlen || !*lenp ||
-            (*ppos && !write)) {
+
+        if (!data || !maxlen || !*lenp) {
                 *lenp = 0;
                 return 0;
         }
-        
+
         if (write) {
                 len = 0;
                 p = buffer;
@@ -1713,6 +1712,15 @@ static int _proc_do_string(void* data, int maxlen, int write,
                 len = strlen(data);
                 if (len > maxlen)
                         len = maxlen;
+
+                if (*ppos > len) {
+                        *lenp = 0;
+                        return 0;
+                }
+
+                data += *ppos;
+                len  -= *ppos;
+
                 if (len > *lenp)
                         len = *lenp;
                 if (len)