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Address #795 - add NULL check to avoid UB

This commit is contained in:
bakpakin 2021-09-09 07:20:26 -05:00
parent 4d746794cc
commit 468a31f515
1 changed files with 3 additions and 2 deletions
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5
src/core/value.c
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@ -37,8 +37,9 @@ static void push_traversal_node(void *lhs, void *rhs, int32_t index2) {
node.other = (JanetGCObject *) rhs;
node.index = 0;
node.index2 = index2;
if (janet_vm.traversal + 1 >= janet_vm.traversal_top) {
size_t oldsize = janet_vm.traversal - janet_vm.traversal_base;
int is_new = janet_vm.traversal_base == NULL;
if (is_new || (janet_vm.traversal + 1 >= janet_vm.traversal_top)) {
size_t oldsize = is_new ? 0 : (janet_vm.traversal - janet_vm.traversal_base);
size_t newsize = 2 * oldsize + 1;
if (newsize < 128) {
newsize = 128;