Mesa (master): compiler/glsl: do not downcast list sentinel
Nicolai Hähnle
nh at kemper.freedesktop.org
Sat May 7 21:50:57 UTC 2016
Module: Mesa
Branch: master
Commit: 945c6887ab43a98a6e042841b2fb547aaef250e2
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=945c6887ab43a98a6e042841b2fb547aaef250e2
Author: Nicolai Hähnle <nicolai.haehnle at amd.com>
Date: Sat Apr 30 01:36:59 2016 -0500
compiler/glsl: do not downcast list sentinel
This crashes gcc's undefined behaviour sanitizer.
Reviewed-by: Marek Olšák <marek.olsak at amd.com>
---
src/compiler/glsl/ir.cpp | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/src/compiler/glsl/ir.cpp b/src/compiler/glsl/ir.cpp
index 750f617..d69ab13 100644
--- a/src/compiler/glsl/ir.cpp
+++ b/src/compiler/glsl/ir.cpp
@@ -869,7 +869,8 @@ ir_constant::ir_constant(const struct glsl_type *type, exec_list *value_list)
/* Use each component from each entry in the value_list to initialize one
* component of the constant being constructed.
*/
- for (unsigned i = 0; i < type->components(); /* empty */) {
+ unsigned i = 0;
+ for (;;) {
assert(value->as_constant() != NULL);
assert(!value->is_tail_sentinel());
@@ -901,6 +902,8 @@ ir_constant::ir_constant(const struct glsl_type *type, exec_list *value_list)
break;
}
+ if (i >= type->components())
+ break; /* avoid downcasting a list sentinel */
value = (ir_constant *) value->next;
}
}
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