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Date:   Wed, 7 Dec 2022 22:54:17 +0000
From:   Prashant Malani <pmalani@chromium.org>
To:     Victor Ding <victording@chromium.org>
Cc:     linux-kernel@vger.kernel.org, chrome-platform@lists.linux.dev,
        groeck@chromium.org, dustin@howett.net, gustavoars@kernel.org,
        gregkh@linuxfoundation.org, sebastian.reichel@collabora.com,
        dnojiri@chromium.org, lee.jones@linaro.org, bleung@chromium.org,
        tinghan.shen@mediatek.com, tzungbi@kernel.org,
        Enric Balletbo i Serra <enric.balletbo@collabora.com>,
        Heikki Krogerus <heikki.krogerus@linux.intel.com>
Subject: Re: [PATCH v2] platform/chrome: cros_ec_typec: zero out stale
 pointers
Message-ID: <Y5EZmSSbOFRpfBNj@chromium.org>
References: <20221207093924.v2.1.I1864b6a7ee98824118b93677868d22d3750f439b@changeid>
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Precedence: bulk

On Dec 07 09:39, Victor Ding wrote:
> `cros_typec_get_switch_handles` allocates four pointers when obtaining
> type-c switch handles. These pointers are all freed if failing to obtain
> any of them; therefore, pointers in `port` become stale. The stale
> pointers eventually cause use-after-free or double free in later code
> paths. Zeroing out all pointer fields after freeing to eliminate these
> stale pointers.
> 
> Fixes: f28adb41dab4 ("platform/chrome: cros_ec_typec: Register Type C switches")
> Fixes: 1a8912caba02 ("platform/chrome: cros_ec_typec: Get retimer handle")
> Signed-off-by: Victor Ding <victording@chromium.org>
Acked-by: Prashant Malani <pmalani@chromium.org>

Hey Tzung-Bi, it looks like you've already created a tag for the
v6.2 pull request, so I don't know if it's too late to apply this
for the current dev cycle.
So, I've not applied it, but have left the Acked-by tag.

Please feel free to apply it if there's still room for it before
you send out the pull request.

Thanks!