ws2_32: Return WSAEFAULT from setsockopt() for IP_MULTICAST_LOOP with zero 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>

ws2_32: Return WSAEFAULT from setsockopt() for IP_MULTICAST_LOOP with zero optlen.
c593b2f4 · Paul Gofman · Alexandre Julliard · da745fee · c593b2f4
Commit c593b2f4 authored Mar 08, 2022 by Paul Gofman Committed by Alexandre Julliard Mar 08, 2022
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socket.c dlls/ws2_32/socket.c +5 -0

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--- a/dlls/ws2_32/socket.c
+++ b/dlls/ws2_32/socket.c
@@ -2981,6 +2981,11 @@ int WINAPI setsockopt( SOCKET s, int level, int optname, const char *optval, int
            return server_setsockopt( s, IOCTL_AFD_WINE_SET_IP_MULTICAST_IF, optval, optlen );
        case IP_MULTICAST_LOOP:
+            if (!optlen)
+            {
+                SetLastError( WSAEFAULT );
+                return -1;
+            }
            return server_setsockopt( s, IOCTL_AFD_WINE_SET_IP_MULTICAST_LOOP, optval, optlen );
        case IP_MULTICAST_TTL: