[hackers] [scc] Validate size of array declarations || Roberto E. Vargas Caballero

[git]

commit f071fe5eaccfa08807649ee69b8f8d7ee28a4505
Author:     Roberto E. Vargas Caballero <k...@shike2.com>
AuthorDate: Thu Aug 27 21:31:13 2015 +0200
Commit:     Roberto E. Vargas Caballero <k...@shike2.com>
CommitDate: Thu Aug 27 21:31:13 2015 +0200

    Validate size of array declarations
    
    Array sizes must be possitive integers.

diff --git a/cc1/decl.c b/cc1/decl.c
index c92d546..b615c2f 100644
--- a/cc1/decl.c
+++ b/cc1/decl.c
@@ -105,7 +105,16 @@ arydcl(struct declarators *dp)
        }
        expect(']');
 
-       n = (np == NULL) ? 0 : np->sym->u.i;
+       if (np != NULL) {
+               n = np->sym->u.i;
+               if (n  == 0 || n < 0) {
+                       errorp("array size is not a positive number");
+                       n = 1;
+               }
+       } else {
+               n = 0;
+       }
+
        freetree(np);
 
        push(dp, ARY, n);