linux-kernel - [PATCH] Sound, 6Fire USB: Fix double-free bug in usb6fire_fw_ezusb

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Message-ID: <alpine.LNX.2.00.1106132346370.30934@swampdragon.chaosbits.net>
Date:	Mon, 13 Jun 2011 23:52:02 +0200 (CEST)
From:	Jesper Juhl <jj@...osbits.net>
To:	linux-kernel@...r.kernel.org
cc:	alsa-devel@...a-project.org, Daniel Mack <zonque@...il.com>,
	Lucas De Marchi <lucas.demarchi@...fusion.mobi>,
	Torsten Schenk <torsten.schenk@...o.com>,
	Takashi Iwai <tiwai@...e.de>, Jaroslav Kysela <perex@...ex.cz>
Subject: [PATCH] Sound, 6Fire USB: Fix double-free bug in
 usb6fire_fw_ezusb_upload()

We have a double-free bug in 
sound/usb/6fire/firmware.c::usb6fire_fw_ezusb_upload().
We already call release_firmware(fw) on line 258, so when we then do it 
again after usb6fire_fw_ezusb_write() returns <0, we have a double-free.
Easily fixed by just removing the last call to release_firmware().

Signed-off-by: Jesper Juhl <jj@...osbits.net>
---
 firmware.c |    1 -
 1 file changed, 1 deletion(-)

  Patch against Linus' tree (head at 40779859de0f73b40390c6401a024d06cf024290).

diff --git a/sound/usb/6fire/firmware.c b/sound/usb/6fire/firmware.c
index a91719d..1e3ae33 100644
--- a/sound/usb/6fire/firmware.c
+++ b/sound/usb/6fire/firmware.c
@@ -270,7 +270,6 @@ static int usb6fire_fw_ezusb_upload(
 	data = 0x00; /* resume ezusb cpu */
 	ret = usb6fire_fw_ezusb_write(device, 0xa0, 0xe600, &data, 1);
 	if (ret < 0) {
-		release_firmware(fw);
 		snd_printk(KERN_ERR PREFIX "unable to upload ezusb "
 				"firmware %s: end message.\n", fwname);
 		return ret;


-- 
Jesper Juhl <jj@...osbits.net>       http://www.chaosbits.net/
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