[PATCH 03/10] mDNSResponder: Update to v878.70.2

[Sebastian Huber]

The sources can be obtained via:

https://opensource.apple.com/tarballs/mDNSResponder/mDNSResponder-878.70.2.tar.gz

Update #4010.
---
 mDNSResponder/Makefile             | 2 +-
 mDNSResponder/mDNSCore/DNSCommon.c | 6 ++++--
 mDNSResponder/mDNSShared/dns_sd.h  | 2 +-
 3 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/mDNSResponder/Makefile b/mDNSResponder/Makefile
index fa0a4e49..978c8953 100644
--- a/mDNSResponder/Makefile
+++ b/mDNSResponder/Makefile
@@ -16,7 +16,7 @@
 
 include $(MAKEFILEPATH)/pb_makefiles/platform.make
 
-MVERS = "mDNSResponder-878.50.17"
+MVERS = "mDNSResponder-878.70.2"
 
 VER =
 ifneq ($(strip $(GCC_VERSION)),)
diff --git a/mDNSResponder/mDNSCore/DNSCommon.c b/mDNSResponder/mDNSCore/DNSCommon.c
index 750c10e6..597c4cc0 100644
--- a/mDNSResponder/mDNSCore/DNSCommon.c
+++ b/mDNSResponder/mDNSCore/DNSCommon.c
@@ -2770,7 +2770,9 @@ mDNSexport const mDNSu8 *getDomainName(const DNSMessage *const msg, const mDNSu8
 
         case 0x80:  debugf("getDomainName: Illegal label length 0x%X in domain name %##s", len, name->c); return(mDNSNULL);
 
-        case 0xC0:  offset = (mDNSu16)((((mDNSu16)(len & 0x3F)) << 8) | *ptr++);
+        case 0xC0:  if (ptr >= end)
+            { debugf("getDomainName: Malformed compression label (overruns packet end)"); return(mDNSNULL); }
+            offset = (mDNSu16)((((mDNSu16)(len & 0x3F)) << 8) | *ptr++);
             if (!nextbyte) nextbyte = ptr;              // Record where we got to before we started following pointers
             ptr = (mDNSu8 *)msg + offset;
             if (ptr < (mDNSu8*)msg || ptr >= end)
@@ -3335,7 +3337,7 @@ mDNSexport mDNSBool SetRData(const DNSMessage *const msg, const mDNSu8 *ptr, con
             AssignDomainName(&name, (domainname *)ptr);
             ptr += DomainNameLength(&name);
         }
-        if (!ptr)
+        if (!ptr || ptr >= end)
         {
             LogInfo("SetRData: Malformed name for TSIG/TKEY type %d", rr->resrec.rrtype);
             goto fail;
diff --git a/mDNSResponder/mDNSShared/dns_sd.h b/mDNSResponder/mDNSShared/dns_sd.h
index 94237fb3..0e5c35ee 100644
--- a/mDNSResponder/mDNSShared/dns_sd.h
+++ b/mDNSResponder/mDNSShared/dns_sd.h
@@ -66,7 +66,7 @@
  */
 
 #ifndef _DNS_SD_H
-#define _DNS_SD_H 8785017
+#define _DNS_SD_H 8787002
 
 #ifdef  __cplusplus
 extern "C" {
-- 
2.26.2