From 59bb0ff945f5dfd71647f5b5090fc0a048338158 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Marcin=20=C5=9Alusarz?= <marcin.slusarz@intel.com>
Date: Fri, 24 Jul 2020 17:59:36 +0200
Subject: [PATCH] glsl: catch out of bounds access in the debug version
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Signed-off-by: Marcin Ślusarz <marcin.slusarz@intel.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6067>
---
 src/compiler/glsl/lower_precision.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/compiler/glsl/lower_precision.cpp b/src/compiler/glsl/lower_precision.cpp
index d03c66a..1f116cd 100644
--- a/src/compiler/glsl/lower_precision.cpp
+++ b/src/compiler/glsl/lower_precision.cpp
@@ -445,8 +445,9 @@ is_lowerable_builtin(ir_call *ir,
        */
       const struct util_format_description *desc =
          util_format_description(resource->data.image_format);
-      unsigned i =
+      int i =
          util_format_get_first_non_void_channel(resource->data.image_format);
+      assert(i >= 0);
 
       if (desc->channel[i].pure_integer ||
           desc->channel[i].type == UTIL_FORMAT_TYPE_FLOAT)
-- 
2.7.4