1 files changed, 2 insertions, 0 deletions

diff --git a/arch/s390/lib/uaccess_mvcos.c b/arch/s390/lib/uaccess_mvcos.c
index 7f3eb3d56024..1829742bf479 100644
--- a/arch/s390/lib/uaccess_mvcos.c
+++ b/arch/s390/lib/uaccess_mvcos.c
@@ -184,6 +184,8 @@ static size_t strncpy_from_user_mvcos(size_t count, const char __user *src,
 {
         size_t done, len, offset, len_str;
 
+        if (unlikely(!count))
+                return 0;
         done = 0;
         do {
                 offset = (size_t)src & ~PAGE_MASK;