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Don't permit unary-minus overflow.

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This commit is contained in:
Dianne Skoll
2024-06-04 09:02:26 -04:00
parent 7a40260f0d
commit 632cee62d9
1 changed files with 9 additions and 0 deletions
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9
src/expr.c
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@@ -1406,6 +1406,11 @@ static int unary_minus(expr_node *node, Value *locals, Value *ans, int *nonconst
DestroyValue(v1);
return E_BAD_TYPE;
}
if (v1.v.val == INT_MIN) {
DBG(debug_evaluation_unop(ans, E_2LOW, &v1, "-"));
DestroyValue(v1);
return E_2LOW;
}
ans->type = INT_TYPE;
ans->v.val = -(v1.v.val);
DBG(debug_evaluation_unop(ans, OK, &v1, "-"));
@@ -2142,6 +2147,10 @@ static expr_node *parse_factor(char const **e, int *r, Var *locals, int level)
if (node->type == N_CONSTANT &&
node->u.value.type == INT_TYPE) {
if (op == '-') {
if (node->u.value.v.val == INT_MIN) {
*r = E_2LOW;
return free_expr_tree(node);
}
node->u.value.v.val = -node->u.value.v.val;
} else {
node->u.value.v.val = !node->u.value.v.val;