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From be2b335dc24da491d886dfa68d2c35b38f95d59a Mon Sep 17 00:00:00 2001
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From: Markus Mohrhard <markus.mohrhard@googlemail.com>
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Date: Thu, 14 Aug 2014 01:33:48 +0200
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Subject: [PATCH] fix invalid memory access in base64 functions
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Boost expects the input to be a multiple of 3 bytes for the encoding and
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a multiple of 4 bytes for the decoding. Otherwise it accesses past the
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end of the input array. Therefore we now pad with '\0' and replace the
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generated 'A' with '='.
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---
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src/parser/base64.cpp | 17 ++++++++++++++---
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1 file changed, 14 insertions(+), 3 deletions(-)
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diff --git a/src/parser/base64.cpp b/src/parser/base64.cpp
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index 3d9d770..11ea38e 100644
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--- a/src/parser/base64.cpp
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+++ b/src/parser/base64.cpp
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@@ -49,9 +49,20 @@ void encode_to_base64(const std::vector<char>& input, string& encoded)
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if (input.empty())
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return;
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- string _encoded(to_base64(input.begin()), to_base64(input.end()));
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- size_t pad_size = (3 - input.size() % 3) % 3;
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- _encoded.append(pad_size, '=');
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+ std::vector<char> inp = input;
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+ size_t pad_size = (3 - inp.size() % 3) % 3;
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+ inp.resize(inp.size() + pad_size);
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+
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+ string _encoded(to_base64(inp.begin()), to_base64(inp.end()));
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+
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+ string::reverse_iterator it = _encoded.rbegin();
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+ for (size_t i = 0; i < pad_size; ++i, ++it)
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+ {
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+ // 'A' is a base64 encoding of '\0'
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+ // replace them with padding charachters '='
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+ if (*it == 'A')
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+ *it = '=';
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+ }
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encoded.swap(_encoded);
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}
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--
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2.3.4
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