r300: Check ctx->WinSysDrawBuffer before calling function that dereferences it.

Fixes https://bugs.freedesktop.org/show_bug.cgi?id=10417 .
2007-03-27 09:19:51 +02:00
parent 25f21b5331
commit 63c57a14d3
1 changed files with 1 additions and 1 deletions
@@ -55,7 +55,7 @@ static void radeonUpdatePageFlipping(radeonContextPtr radeon)
 	int use_back;

 	radeon->doPageFlip = radeon->sarea->pfState;
-        if (!radeon->doPageFlip) {
+        if (!radeon->doPageFlip && radeon->glCtx->WinSysDrawBuffer) {
           driFlipRenderbuffers(radeon->glCtx->WinSysDrawBuffer, GL_FALSE);
        }