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Related upstream commit (this bug has been fixed upstream in a
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different way):
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commit 2212c1420c92a33b0e0bd9a34938c9814a56c0f7
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Author: Andreas Schwab <schwab@suse.de>
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Date: Thu Feb 19 15:52:08 2015 +0100
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Simplify handling of nameserver configuration in resolver
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Remove use of ext.nsmap member of struct __res_state and always use
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an identity mapping betwen the nsaddr_list array and the ext.nsaddrs
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array. The fact that a nameserver has an IPv6 address is signalled by
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setting nsaddr_list[].sin_family to zero.
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diff -rup glibc-2.17-c758a686/resolv/res_init.c glibc-2.17-c758a686/resolv/res_init.c
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--- glibc-2.17-c758a686/resolv/res_init.c 2012-07-26 15:10:45.655638776 -0600
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+++ glibc-2.17-c758a686/resolv/res_init.c 2012-07-26 15:11:27.731423002 -0600
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@@ -314,9 +314,9 @@ __res_vinit(res_state statp, int preinit
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cp++;
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if ((*cp != '\0') && (*cp != '\n')
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&& __inet_aton(cp, &a)) {
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- statp->nsaddr_list[nservall].sin_addr = a;
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- statp->nsaddr_list[nservall].sin_family = AF_INET;
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- statp->nsaddr_list[nservall].sin_port =
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+ statp->nsaddr_list[nserv].sin_addr = a;
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+ statp->nsaddr_list[nserv].sin_family = AF_INET;
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+ statp->nsaddr_list[nserv].sin_port =
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htons(NAMESERVER_PORT);
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nserv++;
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#ifdef _LIBC
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diff -rup glibc-2.17-c758a686/resolv/res_send.c glibc-2.17-c758a686/resolv/res_send.c
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--- glibc-2.17-c758a686/resolv/res_send.c 2010-05-04 05:27:23.000000000 -0600
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+++ glibc-2.17-c758a686/resolv/res_send.c 2012-07-26 15:34:58.398261659 -0600
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@@ -421,10 +421,10 @@ __libc_res_nsend(res_state statp, const
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EXT(statp).nsmap[n] = MAXNS;
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}
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}
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- n = statp->nscount;
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- if (statp->nscount > EXT(statp).nscount)
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+ n = statp->nscount - EXT(statp).nscount6;
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+ if (n > EXT(statp).nscount)
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for (n = EXT(statp).nscount, ns = 0;
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- n < statp->nscount; n++) {
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+ n < statp->nscount - EXT(statp).nscount6; n++) {
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while (ns < MAXNS
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&& EXT(statp).nsmap[ns] != MAXNS)
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ns++;
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@@ -441,7 +441,7 @@ __libc_res_nsend(res_state statp, const
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malloc(sizeof (struct sockaddr_in6));
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if (EXT(statp).nsaddrs[n] != NULL) {
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memset (mempcpy(EXT(statp).nsaddrs[n],
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- &statp->nsaddr_list[n],
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+ &statp->nsaddr_list[ns],
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sizeof (struct sockaddr_in)),
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'\0',
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sizeof (struct sockaddr_in6)
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