libvncclient/sockets: check client->sock before another FD_ISSET

bk138 · bk138 · commit 7b463f76b79e · 2025-03-05T22:10:33.000+01:00
diff --git a/src/libvncclient/sockets.c b/src/libvncclient/sockets.c
@@ -1004,7 +1004,7 @@ int WaitForMessage(rfbClient* client,unsigned int usecs)
     return num;
   }
 
-  if(FD_ISSET(client->sock, &fds))
+  if(client->sock != RFB_INVALID_SOCKET && FD_ISSET(client->sock, &fds))
     client->serverMsg = TRUE;
   if(client->multicastSock >= 0 && FD_ISSET(client->multicastSock, &fds))
     client->serverMsgMulticast = TRUE;

Original file line number	Diff line number	Diff line change
`@@ -1004,7 +1004,7 @@ int WaitForMessage(rfbClient* client,unsigned int usecs)`
`1004`	`1004`	`return num;`
`1005`	`1005`	`}`
`1006`	`1006`
`1007`		`- if(FD_ISSET(client->sock, &fds))`
	`1007`	`+ if(client->sock != RFB_INVALID_SOCKET && FD_ISSET(client->sock, &fds))`
`1008`	`1008`	`client->serverMsg = TRUE;`
`1009`	`1009`	`if(client->multicastSock >= 0 && FD_ISSET(client->multicastSock, &fds))`
`1010`	`1010`	`client->serverMsgMulticast = TRUE;`