dnsproxy: Make sure "rr" is not NULL

I've caught some crashes with connman where "rr" ended up being NULL;
easy to add a check for this and prevent the crash.

diff --git a/src/dnsproxy.c b/src/dnsproxy.c
index f3fc30f..cdc5b11 100644 (file)
--- a/src/dnsproxy.c
+++ b/src/dnsproxy.c
@@ -579,6 +579,9 @@ static int parse_rr(unsigned char *buf, unsigned char *start,
 
        rr = (void *) (*end);
 
+       if (rr == NULL)
+               return -EINVAL;
+
        *type = ntohs(rr->type);
        *class = ntohs(rr->class);
        *ttl = ntohl(rr->ttl);