linux-kernel - Re: [PATCH v6 2/2] rpmsg: char: Fix race between the release of rpmsg

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Date:   Mon, 10 Jan 2022 13:09:52 -0800
From:   Stephen Boyd <swboyd@...omium.org>
To:     Andy Gross <agross@...nel.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Ohad Ben-Cohen <ohad@...ery.com>
Cc:     linux-kernel@...r.kernel.org, linux-remoteproc@...r.kernel.org,
        Sibi Sankar <sibis@...eaurora.org>,
        Sujit Kautkar <sujitka@...omium.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>
Subject: Re: [PATCH v6 2/2] rpmsg: char: Fix race between the release of
 rpmsg_eptdev and cdev

Quoting Matthias Kaehlcke (2022-01-10 10:47:37)
> struct rpmsg_eptdev contains a struct cdev. The current code frees
> the rpmsg_eptdev struct in rpmsg_eptdev_destroy(), but the cdev is
> a managed object, therefore its release is not predictable and the
> rpmsg_eptdev could be freed before the cdev is entirely released.
>
> The cdev_device_add/del() API was created to address this issue
> (see commit 233ed09d7fda), use it instead of cdev add/del().
>
> Fixes: c0cdc19f84a4 ("rpmsg: Driver for user space endpoint interface")
> Suggested-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> Reviewed-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> ---

Reviewed-by: Stephen Boyd <swboyd@...omium.org>