From e9c6c6544dc34ed1c145b03b798f1d63f2d32283 Mon Sep 17 00:00:00 2001
From: Laurent Bercot <ska-skaware@skarnet.org>
Date: Fri, 15 Jan 2021 02:07:13 +0000
Subject:  Do not overwrite the question when reading an answer via UDP

---
 src/libs6dns/s6dns_engine.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/libs6dns/s6dns_engine.c b/src/libs6dns/s6dns_engine.c
index 226bdcf..a4dc8bc 100644
--- a/src/libs6dns/s6dns_engine.c
+++ b/src/libs6dns/s6dns_engine.c
@@ -272,12 +272,11 @@ static int s6dns_engine_read_udp (s6dns_engine_t *dt, tain_t const *stamp)
       memset(s6dns_ip46list_ip(&dt->servers, dt->curserver), 0, SKALIBS_IP_SIZE) ; /* do not query it again */
     default : prepare_next(dt, stamp, 0) ; return 0 ;
   }
-  if (!stralloc_copyb(&dt->sa, buf, r))
+  if (!stralloc_catb(&dt->sa, buf, r))
   {
     fd_close(dt->fd) ; dt->fd = -1 ;
     return 0 ;
   }
-  dt->querylen = 0 ;
   fd_close(dt->fd) ; dt->fd = -1 ;
   dt->flagreading = 0 ;
   return 1 ;
-- 
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