Fail if fd is too big and poll() is not available

[free-sw/xcb/libxcb] / src / xcb_conn.c

diff --git a/src/xcb_conn.c b/src/xcb_conn.c
index 251d62e..1d37614 100644 (file)
--- a/src/xcb_conn.c
+++ b/src/xcb_conn.c
@@ -210,9 +210,19 @@ xcb_connection_t *xcb_connect_to_fd(int fd, xcb_auth_info_t *auth_info)
 {
     xcb_connection_t* c;
 
+#ifndef USE_POLL
+    if(fd >= FD_SETSIZE) /* would overflow in FD_SET */
+    {
+        close(fd);
+        return (xcb_connection_t *) &error_connection;
+    }
+#endif
+
     c = calloc(1, sizeof(xcb_connection_t));
-    if(!c)
+    if(!c) {
+        close(fd);
         return (xcb_connection_t *) &error_connection;
+    }
 
     c->fd = fd;