1 files changed, 8 insertions, 0 deletions
diff --git a/nx-X11/lib/X11/XlibInt.c b/nx-X11/lib/X11/XlibInt.c
index 564d318fc..deab8b3ad 100644
--- a/nx-X11/lib/X11/XlibInt.c
+++ b/nx-X11/lib/X11/XlibInt.c
@@ -3980,6 +3980,14 @@ void *_XGetRequest(Display *dpy, CARD8 type, size_t len)
 
     if (dpy->bufptr + len > dpy->bufmax)
        _XFlush(dpy);
+    /* Request still too large, so do not allow it to overflow. */
+    if (dpy->bufptr + len > dpy->bufmax) {
+       fprintf(stderr,
+               "Xlib: request %d length %zd would exceed buffer size.\n",
+               type, len);
+       /* Changes failure condition from overflow to NULL dereference. */
+       return NULL;
+    }
 
     if (len % 4)
        fprintf(stderr,