sysctl: don't overflow the user-supplied buffer with '\0'

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / kernel / sysctl.c

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 9990e10192e8e645c62d1e640b67b48edefe762d..ad0425a8f7099d27ee46e95b833897eb2d4dc475 100644 (file)
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -2201,14 +2201,12 @@ int sysctl_string(ctl_table *table, int __user *name, int nlen,
                if (get_user(len, oldlenp))
                        return -EFAULT;
                if (len) {
-                       l = strlen(table->data);
+                       l = strlen(table->data)+1;
                        if (len > l) len = l;
                        if (len >= table->maxlen)
                                len = table->maxlen;
                        if(copy_to_user(oldval, table->data, len))
                                return -EFAULT;
-                       if(put_user(0, ((char __user *) oldval) + len))
-                               return -EFAULT;
                        if(put_user(len, oldlenp))
                                return -EFAULT;
                }