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-rw-r--r--src/mesa/drivers/x11/xm_api.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/src/mesa/drivers/x11/xm_api.c b/src/mesa/drivers/x11/xm_api.c
index 776928dec4d..cbbbd56efd5 100644
--- a/src/mesa/drivers/x11/xm_api.c
+++ b/src/mesa/drivers/x11/xm_api.c
@@ -483,6 +483,12 @@ xmesa_free_buffer(XMesaBuffer buffer)
/* mark as delete pending */
fb->DeletePending = GL_TRUE;
+
+ /* Since the X window for the XMesaBuffer is going away, we don't
+ * want to dereference this pointer in the future.
+ */
+ b->frontxrb->drawable = 0;
+
/* Unreference. If count = zero we'll really delete the buffer */
_mesa_unreference_framebuffer(&fb);