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libstdc++: Fix out-of-bounds string_view access in filesystem::path [PR 97167] 

libstdc++-v3/ChangeLog:

	PR libstdc++/97167
	* src/c++17/fs_path.cc (path::_Parser::root_path()): Check
	for empty string before inspecting the first character.
	* testsuite/27_io/filesystem/path/append/source.cc: Append
	empty string_view to path.
This commit is contained in:
Jonathan Wakely 2020-09-22 20:02:58 +01:00
parent 809192e77e
commit 49ff88bd0d
2 changed files with 11 additions and 1 deletions
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2
libstdc++-v3/src/c++17/fs_path.cc
View File

@ -81,7 +81,7 @@ struct path::_Parser
const size_t len = input.size();
// look for root name or root directory
if (is_dir_sep(input[0]))
if (len && is_dir_sep(input[0]))
{
#if SLASHSLASH_IS_ROOTNAME
// look for root name, such as "//foo"

10
libstdc++-v3/testsuite/27_io/filesystem/path/append/source.cc
View File

@ -161,6 +161,15 @@ test06()
test(p2, s.c_str());
}
void
test07()
{
path p, p0;
std::string_view s;
p /= s; // PR libstdc++/97167
compare_paths(p, p0);
}
int
main()
{
@ -170,4 +179,5 @@ main()
test04();
test05();
test06();
test07();
}