From 07fe45b84bdf0d236a5bfdc433cc1a908e0c161b Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Tue, 9 Sep 2014 08:12:45 +0100
Subject: [PATCH] sna/glyphs: Prevent NULL vfunc deref with glyphs

Requires running a PRIME setup with Intel loaded as the secondary GPU
and attempting to execute an empty glyph string.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 src/sna/sna_glyphs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/sna/sna_glyphs.c b/src/sna/sna_glyphs.c
index 94d702ae..a4052c6e 100644
--- a/src/sna/sna_glyphs.c
+++ b/src/sna/sna_glyphs.c
@@ -727,7 +727,7 @@ next_glyph:
 		}
 		list++;
 	}
-	if (glyph_atlas)
+	if (glyph_atlas != NO_ATLAS)
 		tmp.done(sna, &tmp);
 
 	return true;