Paul Gofman : ws2_32: Manage shorter length for IPV6_MULTICAST_HOPS.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 67ebbbf3368780c59f3109d89ee25d08efb8e39e
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=67ebbbf3368780c59f3109d89ee25d08efb8e39e

Author: Paul Gofman <pgofman at codeweavers.com>
Date:   Fri Mar 11 13:29:48 2022 +0300

ws2_32: Manage shorter length for IPV6_MULTICAST_HOPS.

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     | 14 +++++++++++++-
 dlls/ws2_32/tests/sock.c |  1 +
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/dlls/ws2_32/socket.c b/dlls/ws2_32/socket.c
index a9e0898e2d7..f4e2f8f172c 100644
--- a/dlls/ws2_32/socket.c
+++ b/dlls/ws2_32/socket.c
@@ -1828,6 +1828,12 @@ int WINAPI getsockopt( SOCKET s, int level, int optname, char *optval, int *optl
             return server_getsockopt( s, IOCTL_AFD_WINE_GET_IPV6_RECVHOPLIMIT, optval, optlen );
 
         case IPV6_MULTICAST_HOPS:
+            if (*optlen < 1 || !optval)
+            {
+                SetLastError( WSAEFAULT );
+                return SOCKET_ERROR;
+            }
+            if (*optlen < sizeof(DWORD)) *optlen = 1;
             return server_getsockopt( s, IOCTL_AFD_WINE_GET_IPV6_MULTICAST_HOPS, optval, optlen );
 
         case IPV6_MULTICAST_IF:
@@ -3193,7 +3199,13 @@ int WINAPI setsockopt( SOCKET s, int level, int optname, const char *optval, int
             return server_setsockopt( s, IOCTL_AFD_WINE_SET_IPV6_RECVHOPLIMIT, optval, optlen );
 
         case IPV6_MULTICAST_HOPS:
-            return server_setsockopt( s, IOCTL_AFD_WINE_SET_IPV6_MULTICAST_HOPS, optval, optlen );
+            if (!optlen || !optval)
+            {
+                SetLastError( WSAEFAULT );
+                return SOCKET_ERROR;
+            }
+            memcpy( &value, optval, min( optlen, sizeof(value) ));
+            return server_setsockopt( s, IOCTL_AFD_WINE_SET_IPV6_MULTICAST_HOPS, (char *)&value, sizeof(value) );
 
         case IPV6_MULTICAST_IF:
             return server_setsockopt( s, IOCTL_AFD_WINE_SET_IPV6_MULTICAST_IF, optval, optlen );
diff --git a/dlls/ws2_32/tests/sock.c b/dlls/ws2_32/tests/sock.c
index 66bd5452046..001cfc0e98e 100644
--- a/dlls/ws2_32/tests/sock.c
+++ b/dlls/ws2_32/tests/sock.c
@@ -1191,6 +1191,7 @@ static void test_set_getsockopt(void)
         {AF_INET, SOCK_DGRAM, IPPROTO_IP, IP_TTL, TRUE, {1, 1, 4}, {0}, FALSE},
         {AF_INET6, SOCK_STREAM, IPPROTO_IPV6, IPV6_DONTFRAG, TRUE, {1, 1, 4}, {0}, TRUE, TRUE},
         {AF_INET6, SOCK_DGRAM, IPPROTO_IPV6, IPV6_HOPLIMIT, FALSE, {0, 0, 4}, {0}, TRUE, TRUE},
+        {AF_INET6, SOCK_DGRAM, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, TRUE, {1, 1, 4}, {0}, FALSE},
     };
     SOCKET s, s2;
     int i, j, err, lasterr;