ws2_32: Return WSAENOBUFS from setsockopt() for IPPROTO_IP with negative optlen.

Signed-off-by: Paul Gofman <pgofman@codeweavers.com>
Signed-off-by: Zebediah Figura <zfigura@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>

dlls/ws2_32/socket.c

@@ -2946,6 +2946,12 @@ int WINAPI setsockopt( SOCKET s, int level, int optname, const char *optval, int
         break;
 
     case IPPROTO_IP:
+        if (optlen < 0)
+        {
+            SetLastError(WSAENOBUFS);
+            return SOCKET_ERROR;
+        }
+
         switch(optname)
         {
         case IP_ADD_MEMBERSHIP: