src/liboping.c: Check if pointer is NULL before dereferencing it in `ping_receive_ipv4'.

Thanks to Tomasz Pala for pointing out the problem.

diff --git a/src/liboping.c b/src/liboping.c
index 579aba3..0cff9f4 100644 (file)
--- a/src/liboping.c
+++ b/src/liboping.c
@@ -342,8 +342,9 @@ static pinghost_t *ping_receive_ipv4 (pinghost_t *ph, char *buffer, size_t buffe
                dprintf ("No match found for ident = 0x%04x, seq = %i\n",
                                ident, seq);
        }
-       
-       ptr->recv_ttl = ip_hdr->ip_ttl;
+
+       if (ptr != NULL)
+               ptr->recv_ttl = ip_hdr->ip_ttl;
 
        return (ptr);
 }