[Mesa-dev] [PATCH] glx: Fix __glXWireToEvent for BufferSwapComplete

Adam Jackson ajax at redhat.com
Fri Jul 31 08:32:58 PDT 2015

In the DRI2 path this event is magically synthesized from the
corresponding DRI2 event, but with Present, the server sends us the
event itself. The DRI2 path fills in the serial number, send_event, and
display fields of the XEvent struct that the app sees, but the Present
path did not.

This is likely related to a class of crashes seen in gtk/clutter apps:


Note that the crashing instruction is looking up the lock_fns slot in
the Display *, and %rdi (holding the Display *) is 0x1.

Cc: mesa-stable at lists.freedesktop.org
Signed-off-by: Adam Jackson <ajax at redhat.com>
 src/glx/glxext.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/glx/glxext.c b/src/glx/glxext.c
index fdc24d4..dc87fb9 100644
--- a/src/glx/glxext.c
+++ b/src/glx/glxext.c
@@ -138,6 +138,9 @@ __glXWireToEvent(Display *dpy, XEvent *event, xEvent *wire)
       if (!glxDraw)
 	 return False;
+      aevent->serial = _XSetLastRequestRead(dpy, (xGenericReply *) wire);
+      aevent->send_event = (awire->type & 0x80) != 0;
+      aevent->display = dpy;
       aevent->event_type = awire->event_type;
       aevent->drawable = glxDraw->xDrawable;
       aevent->ust = ((CARD64)awire->ust_hi << 32) | awire->ust_lo;

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