+++ /dev/null
-From 3d9181d7bdd8e491f745dbc9e34bd20b6f6da069 Mon Sep 17 00:00:00 2001
-From: Gergely Nagy <ngg@tresorit.com>
-Date: Wed, 14 Dec 2016 13:19:01 +0100
-Subject: [PATCH] Fix possible DoS in ASN.1 decoders (CVE-2016-9939)
-
-Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
----
- asn.cpp | 10 ++++++++++
- asn.h | 2 ++
- 2 files changed, 12 insertions(+)
-
-diff --git a/asn.cpp b/asn.cpp
-index 297ff01..2e923ef 100644
---- a/asn.cpp
-+++ b/asn.cpp
-@@ -123,6 +123,8 @@ size_t BERDecodeOctetString(BufferedTransformation &bt, SecByteBlock &str)
- size_t bc;\r
- if (!BERLengthDecode(bt, bc))\r
- BERDecodeError();\r
-+ if (bc > bt.MaxRetrievable())\r
-+ BERDecodeError();\r
- \r
- str.New(bc);\r
- if (bc != bt.Get(str, bc))\r
-@@ -139,6 +141,8 @@ size_t BERDecodeOctetString(BufferedTransformation &bt, BufferedTransformation &
- size_t bc;\r
- if (!BERLengthDecode(bt, bc))\r
- BERDecodeError();\r
-+ if (bc > bt.MaxRetrievable())\r
-+ BERDecodeError();\r
- \r
- bt.TransferTo(str, bc);\r
- return bc;\r
-@@ -161,6 +165,8 @@ size_t BERDecodeTextString(BufferedTransformation &bt, std::string &str, byte as
- size_t bc;\r
- if (!BERLengthDecode(bt, bc))\r
- BERDecodeError();\r
-+ if (bc > bt.MaxRetrievable())\r
-+ BERDecodeError();\r
- \r
- SecByteBlock temp(bc);\r
- if (bc != bt.Get(temp, bc))\r
-@@ -188,6 +194,10 @@ size_t BERDecodeBitString(BufferedTransformation &bt, SecByteBlock &str, unsigne
- size_t bc;\r
- if (!BERLengthDecode(bt, bc))\r
- BERDecodeError();\r
-+ if (bc == 0)\r
-+ BERDecodeError();\r
-+ if (bc > bt.MaxRetrievable())\r
-+ BERDecodeError();\r
- \r
- byte unused;\r
- if (!bt.Get(unused))\r
-diff --git a/asn.h b/asn.h
-index ed9de52..33f0dd0 100644
---- a/asn.h
-+++ b/asn.h
-@@ -498,6 +498,8 @@ void BERDecodeUnsigned(BufferedTransformation &in, T &w, byte asnTag = INTEGER,
- bool definite = BERLengthDecode(in, bc);\r
- if (!definite)\r
- BERDecodeError();\r
-+ if (bc > in.MaxRetrievable())\r
-+ BERDecodeError();\r
- \r
- SecByteBlock buf(bc);\r
- \r
---
-2.10.2
-