linux-kernel - Re: [PATCH] rsi: fix a double free bug in rsi_91x

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Message-Id: <20190903135521.34A40602FE@smtp.codeaurora.org>
Date:   Tue,  3 Sep 2019 13:55:21 +0000 (UTC)
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Hui Peng <benquike@...il.com>
Cc:     security@...nel.org, Hui Peng <benquike@...il.com>,
        Mathias Payer <mathias.payer@...elwelt.net>,
        "David S. Miller" <davem@...emloft.net>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rsi: fix a double free bug in rsi_91x_deinit()

Hui Peng <benquike@...il.com> wrote:

> `dev` (struct rsi_91x_usbdev *) field of adapter
> (struct rsi_91x_usbdev *) is allocated  and initialized in
> `rsi_init_usb_interface`. If any error is detected in information
> read from the device side,  `rsi_init_usb_interface` will be
> freed. However, in the higher level error handling code in
> `rsi_probe`, if error is detected, `rsi_91x_deinit` is called
> again, in which `dev` will be freed again, resulting double free.
> 
> This patch fixes the double free by removing the free operation on
> `dev` in `rsi_init_usb_interface`, because `rsi_91x_deinit` is also
> used in `rsi_disconnect`, in that code path, the `dev` field is not
>  (and thus needs to be) freed.
> 
> This bug was found in v4.19, but is also present in the latest version
> of kernel. Fixes CVE-2019-15504.
> 
> Reported-by: Hui Peng <benquike@...il.com>
> Reported-by: Mathias Payer <mathias.payer@...elwelt.net>
> Signed-off-by: Hui Peng <benquike@...il.com>
> Reviewed-by: Guenter Roeck <linux@...ck-us.net>

Patch applied to wireless-drivers.git, thanks.

8b51dc729147 rsi: fix a double free bug in rsi_91x_deinit()

-- 
https://patchwork.kernel.org/patch/11102087/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches