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From:   Kalle Valo <kvalo@kernel.org>
To:     =?utf-8?B?SsOpcsO0bWU=?= Pouiller <jerome.pouiller@silabs.com>
Cc:     Dan Carpenter <dan.carpenter@oracle.com>,
        linux-wireless@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: Re: [PATCH] wfx: prevent underflow in wfx_send_pds()
References: <Yv8eX7Xv2ubUOvW7@kili> <2729343.a3EqFhE7eK@pc-42>
Date:   Mon, 29 Aug 2022 19:03:38 +0300
In-Reply-To: <2729343.a3EqFhE7eK@pc-42> (=?utf-8?B?IkrDqXLDtG1l?=
 Pouiller"'s message of "Mon,
        22 Aug 2022 14:20:53 +0200")
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J=C3=A9r=C3=B4me Pouiller <jerome.pouiller@silabs.com> writes:

> On Friday 19 August 2022 07:23:43 CEST Dan Carpenter wrote:
>> This does a "chunk_len - 4" subtraction later when it calls:
>>=20
>>         ret =3D wfx_hif_configuration(wdev, buf + 4, chunk_len - 4);
>>=20
>> so check for "chunk_len" is less than 4.
>
> This patch also ensures that buf[4] won't overflow during:
>
>     if (buf[4] !=3D '{' || buf[chunk_len - 1] !=3D '}')
>     	dev_warn(wdev->dev, "PDS:%d: unexpected content\n", chunk_num);
>
>> Fixes: dcbecb497908 ("staging: wfx: allow new PDS format")
>> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
>
> Reviewed-by: J=C3=A9r=C3=B4me Pouiller <jerome.pouiller@silabs.com>

BTW J=C3=A9r=C3=B4me, as you are the driver maintainer you can use Acked-by.

--=20
https://patchwork.kernel.org/project/linux-wireless/list/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatc=
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