X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;ds=sidebyside;f=src%2Fglx%2Fglxcurrent.c;h=2b9c708c3ee6fc97fd11fa503bbdbbce54a21eb6;hb=d257ec01360be05a745bbb851f08e944bcb23718;hp=fd04929b89f3a2bbac5d5d06b7e291cfbc516420;hpb=af6b7bf23662c610e699e4b7fde1526ca1d1624a;p=mesa.git

diff --git a/src/glx/glxcurrent.c b/src/glx/glxcurrent.c
index fd04929b89f..2b9c708c3ee 100644
--- a/src/glx/glxcurrent.c
+++ b/src/glx/glxcurrent.c
@@ -194,6 +194,13 @@ MakeContextCurrent(Display * dpy, GLXDrawable draw,
       return True;
    }
 
+   /* can't have only one be 0 */
+   if (!!draw != !!read) {
+      __glXUnlock();
+      __glXSendError(dpy, BadMatch, None, X_GLXMakeContextCurrent, True);
+      return False;
+   }
+
    if (oldGC != &dummyContext) {
       if (--oldGC->thread_refcount == 0) {
 	 oldGC->vtable->unbind(oldGC, gc);