Fix ASAN warning.

The commit fixing the stack overflow for malformed Subnets could compare
against a NULL pointer, which works fine in practice but is undefined
behavior.

diff --git a/src/subnet_parse.c b/src/subnet_parse.c
index 044d6e7..312e310 100644 (file)
--- a/src/subnet_parse.c
+++ b/src/subnet_parse.c
@@ -307,7 +307,7 @@ bool str2net(subnet_t *subnet, const char *subnetstr) {
        char *last_colon = strrchr(str, ':');
 
        /* Check that the last colon is not further than possible in an IPv6 address */
-       if(last_colon >= str + 5 * 8) {
+       if(last_colon && last_colon >= str + 5 * 8) {
                return false;
        }