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libstdc++: Do not allow chrono::parse to overflow for %C [PR111162]

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libstdc++-v3/ChangeLog:

	PR libstdc++/111162
	* include/bits/chrono_io.h (_Parser::Operator()): Check %C
	values are in range of year::min() to year::max().
	* testsuite/std/time/parse.cc: Check out of range centuries.
This commit is contained in:
Jonathan Wakely
2023-08-29 13:07:21 +01:00
parent 17a371d05a
commit 207c507499
2 changed files with 20 additions and 1 deletions
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9
libstdc++-v3/include/bits/chrono_io.h
View File

@@ -3171,7 +3171,14 @@ namespace __detail
{
auto __v = __read_signed(__num ? __num : 2);
if (!__is_failed(__err))
__century = __v * 100;
{
int __cmin = (int)year::min() / 100;
int __cmax = (int)year::max() / 100;
if (__cmin <= __v && __v <= __cmax)
__century = __v * 100;
else
__century = -2; // This prevents guessing century.
}
}
else if (__mod == 'E')
{

12
libstdc++-v3/testsuite/std/time/parse.cc
View File

@@ -251,6 +251,18 @@ test_errors()
is >> parse("%H:%M %3y", y); // 61min is out of range but not needed
VERIFY( is.eof() && ! is.fail() );
VERIFY( y == 2010y );
is.clear();
is.str("328 00");
is >> parse("%3C %y", y); // 328 is out of range for %C (PR libstdc++/111162)
VERIFY( is.fail() );
VERIFY( y == 2010y );
is.clear();
is.str("-328 00");
is >> parse("%3C %y", y); // -328 is out of range for %C
VERIFY( is.fail() );
VERIFY( y == 2010y );
}
void