From 771090f25db702d25ebbd3f2b44429cf0acfe8fd Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Fri, 4 May 2012 20:56:37 +0100
Subject: [PATCH] sna: Add a pair of asserts to track down a NULL pointer
 dereference

Looks like the assumption for the location of the data is invalid,
allocation failure, perhaps?

References: https://bugs.freedesktop.org/show_bug.cgi?id=47597
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 src/sna/sna_render.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/sna/sna_render.c b/src/sna/sna_render.c
index dee66086..880e1734 100644
--- a/src/sna/sna_render.c
+++ b/src/sna/sna_render.c
@@ -460,6 +460,8 @@ static struct kgem_bo *upload(struct sna *sna,
 			priv->mapped = false;
 		}
 		if (pixmap->devPrivate.ptr == NULL) {
+			assert(priv->ptr);
+			assert(priv->stride);
 			pixmap->devPrivate.ptr = priv->ptr;
 			pixmap->devKind = priv->stride;
 		}