[source] dnsmasq: forward.c: fix CVE-2017-13704

[LEDE Commits]

blogic pushed a commit to source.git, branch master:
https://git.lede-project.org/ca7933730681bf3a42261fdf045dc1d929cbee48

commit ca7933730681bf3a42261fdf045dc1d929cbee48
Author: Kevin Darbyshire-Bryant <kevin at darbyshire-bryant.me.uk>
AuthorDate: Tue Aug 29 14:29:18 2017 +0100

    dnsmasq: forward.c: fix CVE-2017-13704
    
    Fix SIGSEGV in rfc1035.c answer_request() line 1228 where memset()
    is called with header & limit pointing at the same address and thus
    tries to clear memory from before the buffer begins.
    
    answer_request() is called with an invalid edns packet size provided by
    the client.  Ensure the udp_size provided by the client is bounded by
    512 and configured maximum as per RFC 6891 6.2.3 "Values lower than 512
    MUST be treated as equal to 512"
    
    The client that exposed the problem provided a payload udp size of 0.
    
    Signed-off-by: Kevin Darbyshire-Bryant <kevin at darbyshire-bryant.me.uk>
    Acked-by: Hans Dedecker <dedeckeh at gmail.com>
---
 package/network/services/dnsmasq/Makefile          |  2 +-
 .../dnsmasq/patches/025-fix-CVE-2017-13704.patch   | 37 ++++++++++++++++++++++
 2 files changed, 38 insertions(+), 1 deletion(-)

diff --git a/package/network/services/dnsmasq/Makefile b/package/network/services/dnsmasq/Makefile
index d7f14f9..bd7f610 100644
--- a/package/network/services/dnsmasq/Makefile
+++ b/package/network/services/dnsmasq/Makefile
@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=dnsmasq
 PKG_VERSION:=2.77
-PKG_RELEASE:=9
+PKG_RELEASE:=10
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
 PKG_SOURCE_URL:=http://thekelleys.org.uk/dnsmasq/
diff --git a/package/network/services/dnsmasq/patches/025-fix-CVE-2017-13704.patch b/package/network/services/dnsmasq/patches/025-fix-CVE-2017-13704.patch
new file mode 100644
index 0000000..8848131
--- /dev/null
+++ b/package/network/services/dnsmasq/patches/025-fix-CVE-2017-13704.patch
@@ -0,0 +1,37 @@
+From 38af9b1ac3242a4128e88069c495024caa565f0e Mon Sep 17 00:00:00 2001
+From: Kevin Darbyshire-Bryant <kevin at darbyshire-bryant.me.uk>
+Date: Tue, 29 Aug 2017 12:35:40 +0100
+Subject: [PATCH] forward.c: fix CVE-2017-13704
+
+Fix SIGSEGV in rfc1035.c answer_request() line 1228 where memset()
+is called with header & limit pointing at the same address and thus
+tries to clear memory from before the buffer begins.
+
+answer_request() is called with an invalid edns packet size provided by
+the client.  Ensure the udp_size provided by the client is bounded by
+512 and configured maximum as per RFC 6891 6.2.3 "Values lower than 512
+MUST be treated as equal to 512"
+
+The client that exposed the problem provided a payload udp size of 0.
+
+Signed-off-by: Kevin Darbyshire-Bryant <kevin at darbyshire-bryant.me.uk>
+---
+ src/forward.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/src/forward.c b/src/forward.c
+index f22556a..62c5a5a 100644
+--- a/src/forward.c
++++ b/src/forward.c
+@@ -1408,6 +1408,8 @@ void receive_query(struct listener *listen, time_t now)
+ 	 defaults to 512 */
+       if (udp_size > daemon->edns_pktsz)
+ 	udp_size = daemon->edns_pktsz;
++      if (udp_size < 512)
++	udp_size = 512; /* RFC 6891 6.2.3 */
+     }
+ 
+ #ifdef HAVE_AUTH
+-- 
+2.7.4
+