diff --git a/fs/binfmt_misc.c b/fs/binfmt_misc.c
index c96b855d2a5e..fd8beb9657a2 100644
--- a/fs/binfmt_misc.c
+++ b/fs/binfmt_misc.c
@@ -411,12 +411,12 @@ static int parse_command(const char __user *buffer, size_t count)
 {
 	char s[4];
 
-	if (!count)
-		return 0;
 	if (count > 3)
 		return -EINVAL;
 	if (copy_from_user(s, buffer, count))
 		return -EFAULT;
+	if (!count)
+		return 0;
 	if (s[count-1] == '\n')
 		count--;
 	if (count == 1 && s[0] == '0')