1 files changed, 5 insertions, 4 deletions

diff --git a/lib/strnlen_user.c b/lib/strnlen_user.c
index 60d0bbda8f5e..1c1a1b0e38a5 100644
--- a/lib/strnlen_user.c
+++ b/lib/strnlen_user.c
@@ -114,10 +114,11 @@ long strnlen_user(const char __user *str, long count)
                 unsigned long max = max_addr - src_addr;
                 long retval;
 
-                user_access_begin();
-                retval = do_strnlen_user(str, count, max);
-                user_access_end();
-                return retval;
+                if (user_access_begin(str, max)) {
+                        retval = do_strnlen_user(str, count, max);
+                        user_access_end();
+                        return retval;
+                }
         }
         return 0;
 }