st/mesa: move dereference after null check

We should not dereference shader before we have done the
null check.

Reviewed-by: Erik Faye-Lund <kusmabite@gmail.com>
Reviewed-by: Brian Paul <brianp@vmware.com>

diff --git a/src/mesa/state_tracker/st_atom_image.c b/src/mesa/state_tracker/st_atom_image.c
index 4b48bc3..d0f0c42 100644 (file)
--- a/src/mesa/state_tracker/st_atom_image.c
+++ b/src/mesa/state_tracker/st_atom_image.c
@@ -48,11 +48,13 @@ st_bind_images(struct st_context *st, struct gl_shader *shader,
 {
    unsigned i;
    struct pipe_image_view images[MAX_IMAGE_UNIFORMS];
-   struct gl_program_constants *c = &st->ctx->Const.Program[shader->Stage];
+   struct gl_program_constants *c;
 
    if (!shader || !st->pipe->set_shader_images)
       return;
 
+   c = &st->ctx->Const.Program[shader->Stage];
+
    for (i = 0; i < shader->NumImages; i++) {
       struct gl_image_unit *u = &st->ctx->ImageUnits[shader->ImageUnits[i]];
       struct st_texture_object *stObj = st_texture_object(u->TexObj);