[alsa-devel] [PATCH] Sound, 6Fire USB: Fix double-free bug in usb6fire_fw_ezusb_upload()

[Takashi Iwai]

At Mon, 13 Jun 2011 23:52:02 +0200 (CEST),
Jesper Juhl wrote:
> 
> 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 at chaosbits.net>

Applied now.  Thanks.


Takashi

> ---
>  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 at chaosbits.net>       http://www.chaosbits.net/
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>