linux-kernel - [06/66] ALSA: rawmidi: fix oops (use after free) when unloading a driver module

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Date:	Fri, 22 Oct 2010 11:34:33 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Clemens Ladisch <clemens@...isch.de>,
	Takashi Iwai <tiwai@...e.de>
Subject: [06/66] ALSA: rawmidi: fix oops (use after free) when unloading a driver module

2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Clemens Ladisch <clemens@...isch.de>

commit aa73aec6c385e2c797ac25cc7ccf0318031de7c8 upstream.

When a driver module is unloaded and the last still open file is a raw
MIDI device, the card and its devices will be actually freed in the
snd_card_file_remove() call when that file is closed.  Afterwards, rmidi
and rmidi->card point into freed memory, so the module pointer is likely
to be garbage.
(This was introduced by commit 9a1b64caac82aa02cb74587ffc798e6f42c6170a.)

Signed-off-by: Clemens Ladisch <clemens@...isch.de>
Reported-by: Krzysztof Foltman <wdev@...tman.com>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 sound/core/rawmidi.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/sound/core/rawmidi.c
+++ b/sound/core/rawmidi.c
@@ -530,13 +530,15 @@ static int snd_rawmidi_release(struct in
 {
 	struct snd_rawmidi_file *rfile;
 	struct snd_rawmidi *rmidi;
+	struct module *module;
 
 	rfile = file->private_data;
 	rmidi = rfile->rmidi;
 	rawmidi_release_priv(rfile);
 	kfree(rfile);
+	module = rmidi->card->module;
 	snd_card_file_remove(rmidi->card, file);
-	module_put(rmidi->card->module);
+	module_put(module);
 	return 0;
 }
 


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