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Message-ID: <202309291027.305751B8@keescook>
Date: Fri, 29 Sep 2023 10:28:34 -0700
From: Kees Cook <keescook@...omium.org>
To: "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>,
linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-hardening@...r.kernel.org
Subject: Re: [PATCH][next] media: usb: siano: Fix undefined behavior bug in
struct smsusb_urb_t
On Fri, Sep 29, 2023 at 05:42:11PM +0200, Gustavo A. R. Silva wrote:
> `struct urb` is a flexible structure, which means that it contains a
> flexible-array member at the bottom. This could potentially lead to an
> overwrite of the object `wq` at run-time with the contents of `urb`.
>
> Fix this by placing object `urb` at the end of `struct smsusb_urb_t`.
>
> Fixes: dd47fbd40e6e ("[media] smsusb: don't sleep while atomic")
> Cc: stable@...r.kernel.org
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
As Jann pointed out, it's unlikely there is a function bug here, but I
still think it's right to make sure this is robust and clears the way
for -Wflex-array-member-not-at-end.
Reviewed-by: Kees Cook <keescook@...omium.org>
--
Kees Cook
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