From e83b4786d78b97f1657e96c0dfd13f0e9298e55f Mon Sep 17 00:00:00 2001
From: Waldemar Brodkorb <wbx@openadk.org>
Date: Sun, 13 Dec 2015 23:42:34 +0100
Subject: resolv: __dns_lookup - immediately switch to next server in case of
 poll() set error events

https://bugs.busybox.net/show_bug.cgi?id=3211

Signed-off-by: Leonid Lisovskiy <lly.dev@gmail.com>
Signed-off-by: Waldemar Brodkorb <wbx@uclibc-ng.org>
---
 libc/inet/resolv.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libc/inet/resolv.c b/libc/inet/resolv.c
index fffe4281c..8e5a97db0 100644
--- a/libc/inet/resolv.c
+++ b/libc/inet/resolv.c
@@ -1410,6 +1410,10 @@ int __dns_lookup(const char *name,
 			 * to next nameserver */
 			goto try_next_server;
 		}
+		if (fds.revents & (POLLERR | POLLHUP | POLLNVAL)) {
+			DPRINTF("Bad event\n");
+			goto try_next_server;
+		}
 /*TODO: better timeout accounting?*/
 		reply_timeout -= 1000;
 #endif /* USE_SELECT */
-- 
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