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glcpp: Fix segfault when validating macro redefinitions

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In _token_list_equal_ignoring_space(token_list_t*, token_list_t*), add
a guard that prevents dereferncing a null token list.

This fixes test src/glsl/glcpp/tests/092-redefine-macro-error-2.c and
Bugzilla #32695.
This commit is contained in:
Chad Versace 2011-01-10 16:55:17 -08:00
parent c0cdae0368
commit 4fff52f1c9
1 changed files with 21 additions and 0 deletions
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21
src/glsl/glcpp/glcpp-parse.y
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@ -824,11 +824,32 @@ _token_list_trim_trailing_space (token_list_t *list)
}
}
int
_token_list_is_empty_ignoring_space (token_list_t *l)
{
token_node_t *n;
if (l == NULL)
return 1;
n = l->head;
while (n != NULL && n->token->type == SPACE)
n = n->next;
return n == NULL;
}
int
_token_list_equal_ignoring_space (token_list_t *a, token_list_t *b)
{
token_node_t *node_a, *node_b;
if (a == NULL || b == NULL) {
int a_empty = _token_list_is_empty_ignoring_space(a);
int b_empty = _token_list_is_empty_ignoring_space(b);
return a_empty == b_empty;
}
node_a = a->head;
node_b = b->head;