linux-kernel - Re: [PATCH] platform/chrome: cros_ec

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Date:   Wed, 7 Dec 2022 00:02:03 -0800
From:   Prashant Malani <pmalani@...omium.org>
To:     Victor Ding <victording@...omium.org>
Cc:     linux-kernel@...r.kernel.org, chrome-platform@...ts.linux.dev,
        tinghan.shen@...iatek.com, gustavoars@...nel.org,
        sebastian.reichel@...labora.com, dnojiri@...omium.org,
        bleung@...omium.org, lee.jones@...aro.org, groeck@...omium.org,
        tzungbi@...nel.org, gregkh@...uxfoundation.org, dustin@...ett.net
Subject: Re: [PATCH] platform/chrome: cros_ec_typec: zero out stale pointers

Hi Victor,

On Tue, Dec 6, 2022 at 8:02 PM Victor Ding <victording@...omium.org> wrote:
>
> `cros_typec_get_switch_handles` allocates several pointers when
> obtaining four handles. These pointers are all freed if failing to
> obtain any of the four handles; therefore, pointers in `port` becomes
> stale. The stale pointers eventually cause use-after-free or double in
> later code paths.
>
> This patch proposes
Please use the imperative form [1]

> to elimite these stale pointers by zeroing them out

s/elimite/eliminate

> right after they are freed.
>
> Signed-off-by: Victor Ding <victording@...omium.org>
This should have a "Fixes" tag.

Best regards,

-Prashant

[1] https://www.kernel.org/doc/html/latest/process/submitting-patches.html#describe-your-changes