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From 684bede049a006a0a47ce88f017ada9f73bf4430 Mon Sep 17 00:00:00 2001
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From: Doran Moppert <dmoppert@redhat.com>
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Date: Tue, 26 Sep 2017 14:48:20 +0930
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Subject: [PATCH] google patch hand-applied
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---
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src/edns0.c | 10 +++++-----
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src/forward.c | 4 ++++
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src/rfc1035.c | 3 +++
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3 files changed, 12 insertions(+), 5 deletions(-)
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diff --git a/src/edns0.c b/src/edns0.c
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index d75d3cc..7d8cf7f 100644
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--- a/src/edns0.c
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+++ b/src/edns0.c
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@@ -212,11 +212,11 @@ size_t add_pseudoheader(struct dns_header *header, size_t plen, unsigned char *l
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/* Copy back any options */
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if (buff)
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{
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- if (p + rdlen > limit)
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- {
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- free(buff);
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- return plen; /* Too big */
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- }
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+ if (p + rdlen > limit)
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+ {
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+ free(buff);
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+ return plen; /* Too big */
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+ }
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memcpy(p, buff, rdlen);
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free(buff);
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p += rdlen;
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diff --git a/src/forward.c b/src/forward.c
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index ed9c8f6..77059ed 100644
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--- a/src/forward.c
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+++ b/src/forward.c
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@@ -1542,6 +1542,10 @@ void receive_query(struct listener *listen, time_t now)
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udp_size = PACKETSZ; /* Sanity check - can't reduce below default. RFC 6891 6.2.3 */
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}
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+ // Make sure the udp size is not smaller than the incoming message so that we
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+ // do not underflow
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+ if (udp_size < n) udp_size = n;
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+
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#ifdef HAVE_AUTH
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if (auth_dns)
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{
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diff --git a/src/rfc1035.c b/src/rfc1035.c
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index f1edc45..15041cc 100644
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--- a/src/rfc1035.c
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+++ b/src/rfc1035.c
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@@ -1326,6 +1326,9 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
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size_t len;
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int rd_bit = (header->hb3 & HB3_RD);
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+ // Make sure we do not underflow here too.
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+ if (qlen > (limit - ((char *)header))) return 0;
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+
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/* never answer queries with RD unset, to avoid cache snooping. */
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if (ntohs(header->ancount) != 0 ||
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ntohs(header->nscount) != 0 ||
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--
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2.21.1
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