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gh-120754: _io Ensure stat cache is cleared on fd change (#125166)

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Performed an audit of `fileio.c` and `_pyio` and made sure anytime the
fd changes the stat result, if set, is also cleared/changed.

There's one case where it's not cleared, if code would clear it in
__init__, keep the memory allocated and just do another fstat with the
existing memory.
This commit is contained in:
Cody Maloney 2024-11-01 14:50:49 -07:00 committed by GitHub
parent c84a136511
commit 72dd4714f9
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
2 changed files with 9 additions and 5 deletions
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3
Lib/_pyio.py
View File

@ -1480,6 +1480,7 @@ class FileIO(RawIOBase):
"""
if self._fd >= 0:
# Have to close the existing file first.
self._stat_atopen = None
try:
if self._closefd:
os.close(self._fd)
@ -1583,6 +1584,7 @@ class FileIO(RawIOBase):
if e.errno != errno.ESPIPE:
raise
except:
self._stat_atopen = None
if owned_fd is not None:
os.close(owned_fd)
raise
@ -1756,6 +1758,7 @@ class FileIO(RawIOBase):
called more than once without error.
"""
if not self.closed:
self._stat_atopen = None
try:
if self._closefd:
os.close(self._fd)

11
Modules/_io/fileio.c
View File

@ -131,6 +131,8 @@ internal_close(fileio *self)
_Py_END_SUPPRESS_IPH
Py_END_ALLOW_THREADS
}
PyMem_Free(self->stat_atopen);
self->stat_atopen = NULL;
if (err < 0) {
errno = save_errno;
PyErr_SetFromErrno(PyExc_OSError);
@ -268,8 +270,9 @@ _io_FileIO___init___impl(fileio *self, PyObject *nameobj, const char *mode,
if (self->fd >= 0) {
if (self->closefd) {
/* Have to close the existing file first. */
if (internal_close(self) < 0)
if (internal_close(self) < 0) {
return -1;
}
}
else
self->fd = -1;
@ -523,10 +526,8 @@ _io_FileIO___init___impl(fileio *self, PyObject *nameobj, const char *mode,
internal_close(self);
_PyErr_ChainExceptions1(exc);
}
if (self->stat_atopen != NULL) {
PyMem_Free(self->stat_atopen);
self->stat_atopen = NULL;
}
PyMem_Free(self->stat_atopen);
self->stat_atopen = NULL;
done:
#ifdef MS_WINDOWS