glsl: Add null check in loop_analysis.cpp

Check return value from hash_table_find before using it as a pointer

Signed-off-by: Juha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

diff --git a/src/glsl/loop_analysis.cpp b/src/glsl/loop_analysis.cpp
index d6a9ac7..78ac300 100644 (file)
--- a/src/glsl/loop_analysis.cpp
+++ b/src/glsl/loop_analysis.cpp
@@ -589,8 +589,10 @@ get_basic_induction_increment(ir_assignment *ir, hash_table *var_hash)
         loop_variable *lv =
            (loop_variable *) hash_table_find(var_hash, inc_var);
 
-        if (!lv->is_loop_constant())
-           inc = NULL;
+         if (lv == NULL || !lv->is_loop_constant()) {
+            assert(lv != NULL);
+            inc = NULL;
+         }
       } else
         inc = NULL;
    }