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Fix potentially uninitialized storage when parsing octal strings.

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Fixes https://github.com/boostorg/multiprecision/issues/526
This commit is contained in:
jzmaddock
2023-02-05 12:01:41 +00:00
parent 1ffdc1c7c2
commit eb5525e282
3 changed files with 22 additions and 0 deletions
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3
include/boost/multiprecision/cpp_int.hpp
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@@ -1854,7 +1854,10 @@ public:
{
// If this is the most-significant-limb, we may need to allocate an extra one for the overflow:
if (limb + 1 == newsize)
{
result.resize(static_cast<unsigned>(newsize + 1), static_cast<unsigned>(newsize + 1));
result.limbs()[limb + 1] = 0;
}
if (result.size() > limb + 1)
{
result.limbs()[limb + 1] |= val;

1
test/Jamfile.v2
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@@ -1220,6 +1220,7 @@ test-suite misc :
[ run git_issue_313.cpp ]
[ run git_issue_488.cpp ]
[ run git_issue_506.cpp ]
[ run git_issue_526.cpp ]
[ compile git_issue_98.cpp :
[ check-target-builds ../config//has_float128 : <define>TEST_FLOAT128 <source>quadmath : ]
[ check-target-builds ../config//has_gmp : <define>TEST_GMP <source>gmp : ]

18
test/git_issue_526.cpp Normal file
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@@ -0,0 +1,18 @@
///////////////////////////////////////////////////////////////////////////////
// Copyright 2023 John Maddock. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#include <iostream>
#include <boost/multiprecision/cpp_int.hpp>
#include "test.hpp"
int main()
{
using namespace boost::multiprecision;
const std::string v("00000000000000000000000052222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222");
cpp_int V(v);
std::string r = V.str(0, std::ios_base::oct | std::ios_base::showbase);
BOOST_CHECK_EQUAL(r, v.substr(23));
return 0;
}