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Cleanup: in preparation for fixing BZ #16734, fix memory leaks exposed by

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switching fopen()ed streams from mmap to malloc.
This commit is contained in:
Paul Pluzhnikov 2015-03-08 09:46:53 -07:00
parent 9f95dc5d22
commit 18d26750dd
2 changed files with 12 additions and 7 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2015-03-08 Paul Pluzhnikov <ppluzhnikov@google.com>
[BZ #16734]
* libio/genops.c (_IO_unbuffer_all): Renamed from _IO_unbuffer_write.
Cleanup read-only streams as well.
(_IO_cleanup): Call _IO_unbuffer_all instead of _IO_unbuffer_write.
2015-03-08 Samuel Thibault <samuel.thibault@ens-lyon.org>
* sysdeps/mach/hurd/bits/libc-lock.h [_LIBC]: Include

12
libio/genops.c
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@ -935,23 +935,21 @@ weak_alias (_IO_flush_all_linebuffered, _flushlbf)
the atexit routine, just like _IO_cleanup. The problem is we do
not know whether the freeres code is called first or _IO_cleanup.
if the former is the case, we set the DEALLOC_BUFFER variable to
true and _IO_unbuffer_write will take care of the rest. If
_IO_unbuffer_write is called first we add the streams to a list
true and _IO_unbuffer_all will take care of the rest. If
_IO_unbuffer_all is called first we add the streams to a list
which the freeres function later can walk through. */
static void _IO_unbuffer_write (void);
static void _IO_unbuffer_all (void);
static bool dealloc_buffers;
static _IO_FILE *freeres_list;
static void
_IO_unbuffer_write (void)
_IO_unbuffer_all (void)
{
struct _IO_FILE *fp;
for (fp = (_IO_FILE *) _IO_list_all; fp; fp = fp->_chain)
{
if (! (fp->_flags & _IO_UNBUFFERED)
&& (! (fp->_flags & _IO_NO_WRITES)
|| (fp->_flags & _IO_IS_APPENDING))
/* Iff stream is un-orientated, it wasn't used. */
&& fp->_mode != 0)
{
@ -1019,7 +1017,7 @@ _IO_cleanup (void)
The following will make the standard streambufs be unbuffered,
which forces any output from late destructors to be written out. */
_IO_unbuffer_write ();
_IO_unbuffer_all ();
return result;
}