[Mesa-stable] [PATCH 1/4] glsl: Fix crash due to negative array index

[Emil Velikov]

Hi Anuj,

Afaics the series is yet to land on master, this I've not pulled it for
the stable branch. Is the lack of review holding it back ?

Gents can anyone take a look at/review the series ?

Thanks
Emil

On 22/09/14 23:57, Anuj Phogat wrote:
> Currently Mesa crashes with a shader like this:
> 
> [fragmnet shader]
> float[5] array;
> int idx = -2;
> void main()
> {
>    gl_FragColor = vec4(0.0, 1.0, 0.0, array[idx]);
> }
> 
> Cc: <mesa-stable at lists.freedesktop.org>
> Signed-off-by: Anuj Phogat <anuj.phogat at gmail.com>
> ---
>  src/glsl/opt_array_splitting.cpp | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/src/glsl/opt_array_splitting.cpp b/src/glsl/opt_array_splitting.cpp
> index ebb076b..9e73f3c 100644
> --- a/src/glsl/opt_array_splitting.cpp
> +++ b/src/glsl/opt_array_splitting.cpp
> @@ -295,7 +295,7 @@ ir_array_splitting_visitor::split_deref(ir_dereference **deref)
>     ir_constant *constant = deref_array->array_index->as_constant();
>     assert(constant);
>  
> -   if (constant->value.i[0] < (int)entry->size) {
> +   if (constant->value.i[0] >= 0 && constant->value.i[0] < (int)entry->size) {
>        *deref = new(entry->mem_ctx)
>  	 ir_dereference_variable(entry->components[constant->value.i[0]]);
>     } else {
>