in-addr-util: make in_addr_prefix_nth() refuse prefixlen larger than maximum size

2021-02-17 22:57:37 +09:00
parent 518b6da5d3
commit 7b6b05cff9
1 changed files with 3 additions and 2 deletions
@@ -222,8 +222,9 @@ int in_addr_prefix_nth(int family, union in_addr_union *u, unsigned prefixlen, u

        if (family == AF_INET) {
                uint32_t c, n, t;
+
                if (prefixlen > 32)
-                        prefixlen = 32;
+                        return -ERANGE;

                c = be32toh(u->in.s_addr);

@@ -247,7 +248,7 @@ int in_addr_prefix_nth(int family, union in_addr_union *u, unsigned prefixlen, u
                unsigned start_byte = (prefixlen - 1) / 8;

                if (prefixlen > 128)
-                        prefixlen = 128;
+                        return -ERANGE;

                /* First calculate what we have to add */
                delta = nth << ((128 - prefixlen) % 8);