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* dtable.cc (fh_oom): New static fhandler storage.

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(fh_calloc): New static function.  Add a comment to explain why this
	is needed.
	(cnew): Call fh_calloc as placement argument.
	(build_fh_name): Check return code from cnew against address of
	fh_oom to test for out of memory condition.
	(fh_alloc): Ditto.
	(build_fh_pc): Avoid a crash due to useing a NULL fhandler.
	* pipe.cc (fhandler_pipe::create): Check if build_fh_dev returned a
	valid pointer before using it.
This commit is contained in:
Corinna Vinschen
2011-06-30 09:37:36 +00:00
parent 53ffbf09d5
commit 9e1fd6bcf7
3 changed files with 41 additions and 9 deletions
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21
winsup/cygwin/dtable.cc
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@@ -393,7 +393,17 @@ dtable::init_std_file_from_handle (int fd, HANDLE handle)
}
}
#define cnew(name) new ((void *) ccalloc (HEAP_FHANDLER, 1, sizeof (name))) name
/* This is a workaround for the fact that the placement new operator
always calls the constructor, even if the placement pointer is NULL. */
static fhandler_union fh_oom;
static void *
fh_calloc (size_t size)
{
void *ret = ccalloc (HEAP_FHANDLER, 1, size);
return ret ?: (void *) &fh_oom;
}
#define cnew(name) new (fh_calloc (sizeof (name))) name
fhandler_base *
build_fh_name (const char *name, unsigned opt, suffix_info *si)
@@ -402,7 +412,7 @@ build_fh_name (const char *name, unsigned opt, suffix_info *si)
if (pc.error)
{
fhandler_base *fh = cnew (fhandler_nodevice) ();
if (fh)
if (fh != (fhandler_base *) &fh_oom)
fh->set_error (pc.error);
set_errno (fh ? pc.error : EMFILE);
return fh;
@@ -549,6 +559,8 @@ fh_alloc (device dev)
if (fh == fh_unset)
fh = cnew (fhandler_nodevice) ();
if (fh == (fhandler_base *) &fh_oom)
fh = NULL;
return fh;
}
@@ -558,7 +570,10 @@ build_fh_pc (path_conv& pc, bool set_name)
fhandler_base *fh = fh_alloc (pc.dev);
if (!fh)
set_errno (EMFILE);
{
set_errno (EMFILE);
goto out;
}
else if (fh->dev () == FH_ERROR)
goto out;
else if (fh->dev () != FH_NADA)