Package: libgl1-mesa-glx
Version: 8.0.4-1
Severity: important
Tags: patch, upstream
Dear Maintainer,
When enabling GLX_INTEL_swap_event for windows:
in the file src/glx/dri2.c:
DRI2WireToEvent assumes the event it is generating is asociated with a
GLXPixmap, and tries to look up the pixmap in the glxDrawHash hash
table, but as the buffer swap is for a _WINDOW_ not a pixmap the result
is NULL. DRI2WireToEvent then dereferences the null pointer, and SEGVs.
The attached patch handles this situation gracefully.
diff --git b/src/glx/dri2.c a/src/glx/dri2.c
index b1b5013..2cbe968 100644
--- b/src/glx/dri2.c
+++ a/src/glx/dri2.c
@@ -130,10 +130,17 @@ DRI2WireToEvent(Display *dpy, XEvent *event, xEvent *wire)
aevent->msc = ((CARD64)awire->msc_hi << 32) | awire->msc_lo;
glxDraw = GetGLXDrawable(dpy, pdraw->drawable);
- if (awire->sbc < glxDraw->lastEventSbc)
- glxDraw->eventSbcWrap += 0x100000000;
- glxDraw->lastEventSbc = awire->sbc;
- aevent->sbc = awire->sbc + glxDraw->eventSbcWrap;
+ if(glxDraw)
+ {
+ if (awire->sbc < glxDraw->lastEventSbc)
+ glxDraw->eventSbcWrap += 0x100000000;
+ glxDraw->lastEventSbc = awire->sbc;
+ aevent->sbc = awire->sbc + glxDraw->eventSbcWrap;
+ }
+ else
+ {
+ aevent->sbc = awire->sbc;
+ }
return True;
}
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