Mesa (master): ir_reader: Fix some potential NULL pointer dereferences.

[Kenneth Graunke]

Module: Mesa
Branch: master
Commit: c180e95d267c302c40e1cb92e5b134b4e370ef2e
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=c180e95d267c302c40e1cb92e5b134b4e370ef2e

Author: Kenneth Graunke <kenneth at whitecape.org>
Date:   Tue Nov  2 19:53:12 2010 -0700

ir_reader: Fix some potential NULL pointer dereferences.

Found by inspection.

---

 src/glsl/ir_reader.cpp |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/glsl/ir_reader.cpp b/src/glsl/ir_reader.cpp
index 437f54c..7a22a94 100644
--- a/src/glsl/ir_reader.cpp
+++ b/src/glsl/ir_reader.cpp
@@ -263,7 +263,7 @@ read_function_sig(_mesa_glsl_parse_state *st, ir_function *f, s_list *list,
       return;
 
    s_list *paramlist = SX_AS_LIST(type_expr->next);
-   s_list *body_list = SX_AS_LIST(paramlist->next);
+   s_list *body_list = SX_AS_LIST(type_expr->next->next);
    if (paramlist == NULL || body_list == NULL) {
       ir_read_error(st, list, "Expected (signature <type> (parameters ...) "
 			      "(<instruction> ...))");
@@ -677,7 +677,7 @@ read_call(_mesa_glsl_parse_state *st, s_list *list)
    }
 
    s_symbol *name = SX_AS_SYMBOL(list->subexpressions.head->next);
-   s_list *params = SX_AS_LIST(name->next);
+   s_list *params = SX_AS_LIST(list->subexpressions.head->next->next);
    if (name == NULL || params == NULL) {
       ir_read_error(st, list, "expected (call <name> (<param> ...))");
       return NULL;
@@ -1050,8 +1050,8 @@ read_texture(_mesa_glsl_parse_state *st, s_list *list)
       return NULL;
    }
    s_int *offset_x = SX_AS_INT(offset_list->subexpressions.head);
-   s_int *offset_y = SX_AS_INT(offset_x->next);
-   s_int *offset_z = SX_AS_INT(offset_y->next);
+   s_int *offset_y = SX_AS_INT(offset_list->subexpressions.head->next);
+   s_int *offset_z = SX_AS_INT(offset_list->subexpressions.head->next->next);
    if (offset_x == NULL || offset_y == NULL || offset_z == NULL) {
       ir_read_error(st, offset_list, "expected (<int> <int> <int>)");
       return NULL;