From 0ab27aa4e3bcc5f8fcbffde1f32100fc0ea5d055 Mon Sep 17 00:00:00 2001
From: Philip Rebohle <philip.rebohle@tu-dortmund.de>
Date: Fri, 23 Mar 2018 21:38:21 +0100
Subject: [PATCH] [dxbc] Check if the signature is nullptr before using it

Fixes a crash in The Witcher 3.
---
 src/dxbc/dxbc_analysis.cpp | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/src/dxbc/dxbc_analysis.cpp b/src/dxbc/dxbc_analysis.cpp
index 3ad6d21e7..c9c980174 100644
--- a/src/dxbc/dxbc_analysis.cpp
+++ b/src/dxbc/dxbc_analysis.cpp
@@ -49,13 +49,15 @@ namespace dxvk {
   DxbcClipCullInfo DxbcAnalyzer::getClipCullInfo(const Rc<DxbcIsgn>& sgn) const {
     DxbcClipCullInfo result;
     
-    for (auto e = sgn->begin(); e != sgn->end(); e++) {
-      const uint32_t componentCount = e->componentMask.popCount();
-      
-      if (e->systemValue == DxbcSystemValue::ClipDistance)
-        result.numClipPlanes += componentCount;
-      if (e->systemValue == DxbcSystemValue::CullDistance)
-        result.numCullPlanes += componentCount;
+    if (sgn != nullptr) {
+      for (auto e = sgn->begin(); e != sgn->end(); e++) {
+        const uint32_t componentCount = e->componentMask.popCount();
+        
+        if (e->systemValue == DxbcSystemValue::ClipDistance)
+          result.numClipPlanes += componentCount;
+        if (e->systemValue == DxbcSystemValue::CullDistance)
+          result.numCullPlanes += componentCount;
+      }
     }
     
     return result;