linux-kernel - Re: [PATCH next] firmware: thead,th1520-aon: Fix use after free in th1520_aon

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Message-ID: <CAPDyKFo8hyTJHZVLTAVXe2EW4FCPPLm39WWwpjOCqzUQnfNJ3Q@mail.gmail.com>
Date: Tue, 18 Mar 2025 13:14:13 +0100
From: Ulf Hansson <ulf.hansson@...aro.org>
To: Dan Carpenter <dan.carpenter@...aro.org>
Cc: Michal Wilczynski <m.wilczynski@...sung.com>, Drew Fustini <drew@...7.com>, Guo Ren <guoren@...nel.org>, 
	Fu Wei <wefu@...hat.com>, linux-riscv@...ts.infradead.org, 
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH next] firmware: thead,th1520-aon: Fix use after free in th1520_aon_init()

On Sat, 15 Mar 2025 at 11:04, Dan Carpenter <dan.carpenter@...aro.org> wrote:
>
> Record the error code before freeing "aon_chan" to avoid a
> use after free.
>
> Fixes: e4b3cbd840e5 ("firmware: thead: Add AON firmware protocol driver")
> Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>

Applied for next, thanks!

Kind regards
Uffe


> ---
>  drivers/firmware/thead,th1520-aon.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/firmware/thead,th1520-aon.c b/drivers/firmware/thead,th1520-aon.c
> index 4416e9bbf854..38f812ac9920 100644
> --- a/drivers/firmware/thead,th1520-aon.c
> +++ b/drivers/firmware/thead,th1520-aon.c
> @@ -203,6 +203,7 @@ struct th1520_aon_chan *th1520_aon_init(struct device *dev)
>  {
>         struct th1520_aon_chan *aon_chan;
>         struct mbox_client *cl;
> +       int ret;
>
>         aon_chan = kzalloc(sizeof(*aon_chan), GFP_KERNEL);
>         if (!aon_chan)
> @@ -217,8 +218,9 @@ struct th1520_aon_chan *th1520_aon_init(struct device *dev)
>         aon_chan->ch = mbox_request_channel_byname(cl, "aon");
>         if (IS_ERR(aon_chan->ch)) {
>                 dev_err(dev, "Failed to request aon mbox chan\n");
> +               ret = PTR_ERR(aon_chan->ch);
>                 kfree(aon_chan);
> -               return ERR_CAST(aon_chan->ch);
> +               return ERR_PTR(ret);
>         }
>
>         mutex_init(&aon_chan->transaction_lock);
> --
> 2.47.2
>