id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
6817	Appending to an empty path segfaults...	sean@…	Beman Dawes	"path::m_append_separator_if_needed() is not checking the bounds of its inputs and segfaults. Using clang 3.1 with c++0x, this crashes every time, whereas with previous versions this was somehow insulated from this segfault. Guarding against this with calls to empty() is possible, but seems excessively burdensome to check on every append operation.

{{{
#!div style=""font-size: 100%""
Code highlighting:
  {{{#!c++
/* Compile instructions:
clang++ -g -Wall -Wextra -pedantic -Wno-error -Wno-fatal-errors -pedantic-errors -fno-inline -std=c++0x -I/Users/sean/src/boost-prefix/include -Os -Wno-long-long -Wno-unused-parameter -Wsign-compare -stdlib=libc++ -L${HOME}/src/boost-prefix/lib -lboost_filesystem-mt -lboost_system-mt -o test_path test_path.cpp
./test_path
*/
     
#include ""boost/filesystem.hpp""
     
const std::string default_path = ""foo"";
     
int
main(int argc, char* argv[]) {
  boost::filesystem::path init_path;
  init_path /= default_path;
  std::cout << ""Path: "" << init_path << std::endl;
  return 0;
}

}}}
}}}

{{{
Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_INVALID_ADDRESS at address: 0xffffffffffffffe8
0x000000010000db50 in boost::filesystem3::path::m_append_separator_if_needed ()
(gdb) bt
#0  0x000000010000db50 in boost::filesystem3::path::m_append_separator_if_needed ()
#1  0x00000001000015dd in boost::filesystem3::path::append<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > > (this=0x7fff5fbff4e0, source=@0x100002288, cvt=<value temporarily unavailable, due to optimizations>) at path.hpp:679
#2  0x0000000100000f6e in main (argc=1606415584, argv=0x100002288) at test_path.cpp:249
}}}"	Bugs	closed	To Be Determined	filesystem	Boost 1.49.0	Regression	invalid	filesystem append