Patch (ref bug #27572)

[telford at lnx-bsp.net]

See attached, from git-format-patch
Hopefully prevent crash that can occur from dodgy glyph data
(depends on the video driver in use whether the bad pointer turns up).

Please review.
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From 1f20e3b0d130319af0af839ee7c048024b1b5d8c Mon Sep 17 00:00:00 2001
From: root <root at eeepc.(none)>
Date: Sat, 10 Apr 2010 09:45:12 +0000
Subject: [PATCH] Prevent crash when NULL pointer comes back from video driver

---
 render/render.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/render/render.c b/render/render.c
index a32d797..93bb9ef 100644
--- a/render/render.c
+++ b/render/render.c
@@ -1159,6 +1159,12 @@ ProcRenderAddGlyphs (ClientPtr client)
 						   width, height, depth,
 						   CREATE_PIXMAP_USAGE_GLYPH_PICTURE);
 
+		if (! pDstPix) /* Usually implies display driver rejected width, height, depth, etc... */
+		{
+		    err = BadValue;
+		    goto bail;
+		}
+
 		GlyphPicture (glyph)[screen] = pDst =
 			CreatePicture (0, &pDstPix->drawable,
 				       glyphSet->format,
-- 
1.6.0.4

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