scc

commit 7c8e979f1d5f58982cae51893eec769c28b716b3
parent b79fb78e5800e18978ed22288e8ad3bf6702cf0d
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date:   Wed, 20 Jan 2016 15:53:41 +0100

Check correctness of indexes in designators

This is an error and can generate a segmentation fault if
it is not controlled.

Diffstat:
M
cc1/init.c
 | 
5
+++++

1 file changed, 5 insertions(+), 0 deletions(-)
diff --git a/cc1/init.c b/cc1/init.c
@@ -31,12 +31,17 @@ arydesig(Init *ip)
 {
 	TINT npos;
 	Node *np;
+	Type *tp = ip->type;
 
 	if (ip->type->op != ARY)
 		errorp("array index in non-array initializer");
 	next();
 	np = iconstexpr();
 	npos = np->sym->u.i;
+	if (npos < 0 || tp->defined && npos >= tp->n.elem) {
+		errorp("array index in initializer exceeds array bounds");
+		npos = 0;
+	}
 	freetree(np);
 	expect(']');
 	return npos;