Paul Gofman : ws2_32: Return WSAEFAULT from setsockopt() for IP_MULTICAST_LOOP with zero optlen.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: c593b2f48edc8810cdd2cde770a23fa8f80a8807
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=c593b2f48edc8810cdd2cde770a23fa8f80a8807

Author: Paul Gofman <pgofman at codeweavers.com>
Date:   Tue Mar  8 12:22:44 2022 +0300

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

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

---

 dlls/ws2_32/socket.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/dlls/ws2_32/socket.c b/dlls/ws2_32/socket.c
index dacb41a0403..816ca828b90 100644
--- 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: