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From "Travis Vitek (JIRA)" <j...@apache.org>
Subject [jira] Updated: (STDCXX-597) purify reports uninitialized memory read in _rw_get_char
Date Tue, 16 Oct 2007 00:15:50 GMT

     [ https://issues.apache.org/jira/browse/STDCXX-597?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Travis Vitek updated STDCXX-597:
--------------------------------

    Attachment: stdcxx-597.patch


2007-10-15  Travis Vitek  <vitek@roguewave.com>

	STDCXX-597
	* char.cpp (_rw_char_get): Check character count before
	examining string contents to avoid uninitialized memory read.


> purify reports uninitialized memory read in _rw_get_char 
> ---------------------------------------------------------
>
>                 Key: STDCXX-597
>                 URL: https://issues.apache.org/jira/browse/STDCXX-597
>             Project: C++ Standard Library
>          Issue Type: Improvement
>          Components: Test Driver
>            Reporter: Travis Vitek
>            Priority: Minor
>             Fix For: 4.2.1
>
>         Attachments: stdcxx-597.patch
>
>
> ****  Purify instrumented ./21.string.access (pid 2878)  ****
> UMR: Uninitialized memory read:
>   * This is occurring while in thread 2878:
>     _rw_get_char(char const*, char const**, unsigned*) [char.cpp:562]
>     rw_match(char const*, char const*, unsigned) [char.cpp:816]
>      test_access<char, std::char_traits<char>, std::allocator<char> >(char,
std::char_traits<char>*, char*, StringFunc const&, StringTestCase const&) [21.string.access.cpp:274]
>     test_access(StringFunc const&, StringTestCase const&) [21.string.access.cpp:317]
>     _rw_test_case(StringFunc const&, StringTestCase const&,   (*)(StringFunc
const&, StringTestCase const&)) [21.strings.cpp:1298]
>     _rw_run_cases(StringFunc const&, StringTest const&) [21.strings.cpp:1353]
>   * Reading 1 byte from 0x8182256 in the heap.
>   * Address 0x8182256 is 14 bytes into a malloc'd block at 0x8182248 of 46 bytes.
>   * This block was allocated from thread -1207973632:
>     malloc         [rtlib.o]
>     operator new(unsigned) [libstd15d.so]
>     __rw::__rw_allocate(unsigned, int) [memory.cpp:53]
>     std::allocator<char>::allocate(unsigned,  const*) [_allocator.h:144]
>     std::string<char, std::char_traits<char>, std::allocator<char>>::_C_get_rep(unsigned,
unsigned) [string.cc:102]
>     std::string<char, std::char_traits<char>, std::allocator<char>>::string<char,
std::char_traits<char>, std::allocator<char>>[not-in-charge](char const*, unsigned,
std::allocator<char> const&) [string.cc:180]
> ****  Purify instrumented ./21.string.access (pid 2878)  ****
> UMR: Uninitialized memory read:
>   * This is occurring while in thread 2878:
>     _rw_get_char(char const*, char const**, unsigned*) [char.cpp:562]
>     rw_match(char const*, char const*, unsigned) [char.cpp:816]
>      test_access<char, UserTraits<char>, std::allocator<char> >(char,
UserTraits<char>*, char*, StringFunc const&, StringTestCase const&) [21.string.access.cpp:274]
>     test_access(StringFunc const&, StringTestCase const&) [21.string.access.cpp:317]
>     _rw_test_case(StringFunc const&, StringTestCase const&,   (*)(StringFunc
const&, StringTestCase const&)) [21.strings.cpp:1298]
>     _rw_run_cases(StringFunc const&, StringTest const&) [21.strings.cpp:1353]
>   * Reading 1 byte from 0x818d5a6 in the heap.
>   * Address 0x818d5a6 is 14 bytes into a malloc'd block at 0x818d598 of 46 bytes.
>   * This block was allocated from thread -1207973632:
>     malloc         [rtlib.o]
>     operator new(unsigned) [libstd15d.so]
>     __rw::__rw_allocate(unsigned, int) [memory.cpp:53]
>     std::allocator<char>::allocate(unsigned,  const*) [_allocator.h:144]
>     std::basic_string<char, std::char_traits<char>, std::allocator<char>><char,
UserTraits<char>, std::allocator<char> >::_C_get_rep(unsigned, unsigned) [string.cc:102]
>     std::basic_string<char, std::char_traits<char>, std::allocator<char>><char,
UserTraits<char>, std::allocator<char> >::basic_string<char, std::char_traits<char>,
std::allocator<char>>[not-in-charge](char const*, unsigned, std::allocator<char>
const&) [string.cc:180] 

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