[Mesa-stable] [PATCH] anv/pipeline: Don't look at blend state unless we have an attachment

[Jason Ekstrand]

Without this, we may end up dereferencing blend before we check for
binding->index != UINT32_MAX.  However, Vulkan allows the blend state to
be NULL so long as you don't have any color attachments.  This fixes a
segfault when running The Talos Principal.

Fixes: 12f4e00b69e724a23504b7bd3958fb75dc462950
Cc: mesa-stable at lists.freedesktop.org
---
 src/intel/vulkan/genX_pipeline.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/intel/vulkan/genX_pipeline.c b/src/intel/vulkan/genX_pipeline.c
index cfc3bea..e8ac7c6 100644
--- a/src/intel/vulkan/genX_pipeline.c
+++ b/src/intel/vulkan/genX_pipeline.c
@@ -1345,10 +1345,10 @@ has_color_buffer_write_enabled(const struct anv_pipeline *pipeline,
       if (binding->set != ANV_DESCRIPTOR_SET_COLOR_ATTACHMENTS)
          continue;
 
-      const VkPipelineColorBlendAttachmentState *a =
-         &blend->pAttachments[binding->index];
+      if (binding->index == UINT32_MAX)
+         continue;
 
-      if (binding->index != UINT32_MAX && a->colorWriteMask != 0)
+      if (blend->pAttachments[binding->index].colorWriteMask != 0)
          return true;
    }
 
-- 
2.5.0.400.gff86faf