[Mesa-dev] [PATCH] mesa/st: Check for a NULL _LinkedShader[i] before using it.

[Stéphane Marchesin]

The rest of the linker/glsl translation code checks for NULL, so I suppose we should check here too. Fixes crash on exit with i915g instanced drawing.
---
 src/mesa/state_tracker/st_program.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/src/mesa/state_tracker/st_program.c b/src/mesa/state_tracker/st_program.c
index acd3b56..c419c40 100644
--- a/src/mesa/state_tracker/st_program.c
+++ b/src/mesa/state_tracker/st_program.c
@@ -1154,7 +1154,8 @@ destroy_shader_program_variants_cb(GLuint key, void *data, void *userData)
          }
 
 	 for (i = 0; i < Elements(shProg->_LinkedShaders); i++) {
-	    destroy_program_variants(st, shProg->_LinkedShaders[i]->Program);
+	    if (shProg->_LinkedShaders[i])
+               destroy_program_variants(st, shProg->_LinkedShaders[i]->Program);
 	 }
       }
       break;
-- 
1.7.5.4