From 945c6887ab43a98a6e042841b2fb547aaef250e2 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Nicolai=20H=C3=A4hnle?= Date: Sat, 30 Apr 2016 01:36:59 -0500 Subject: [PATCH] compiler/glsl: do not downcast list sentinel MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit This crashes gcc's undefined behaviour sanitizer. Reviewed-by: Marek Olšák --- 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; } } -- 2.7.4