free_connection_partially(): Avoid possible use-after-free for c->hischallenge

diff --git a/src/connection.c b/src/connection.c
index dd52448..6fdd2bc 100644 (file)
--- a/src/connection.c
+++ b/src/connection.c
@@ -64,8 +64,10 @@ void free_connection_partially(connection_t *c) {
        ecdsa_free(&c->ecdsa);
        rsa_free(&c->rsa);
 
-       if(c->hischallenge)
+       if(c->hischallenge) {
                free(c->hischallenge);
+               c->hischallenge = NULL;
+       }
 
        buffer_clear(&c->inbuf);
        buffer_clear(&c->outbuf);