linux-kernel - Re: [PATCH RESEND v2] i2c: i2c-mt65xx: fix NULL ptr dereference

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Message-ID: <20191021121238.GD1145@ninjato>
Date:   Mon, 21 Oct 2019 14:12:38 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Fabien Parent <fparent@...libre.com>
Cc:     linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-i2c@...r.kernel.org,
        tglx@...utronix.de, hsinyi@...omium.org, drinkcat@...omium.org,
        qii.wang@...iatek.com, matthias.bgg@...il.com,
        Cengiz Can <cengiz@...nel.wtf>, Ulrich Hecht <uli@...nd.eu>
Subject: Re: [PATCH RESEND v2] i2c: i2c-mt65xx: fix NULL ptr dereference

On Fri, Oct 18, 2019 at 07:32:13PM +0200, Fabien Parent wrote:
> Since commit abf4923e97c3 ("i2c: mediatek: disable zero-length transfers
> for mt8183"), there is a NULL pointer dereference for all the SoCs
> that don't have any quirk. mtk_i2c_functionality is not checking that
> the quirks pointer is not NULL before starting to use it.
> 
> This commit add a call to i2c_check_quirks which will check whether
> the quirks pointer is set, and if so will check if the IP has the
> NO_ZERO_LEN quirk.
> 
> Fixes: abf4923e97c3 ("i2c: mediatek: disable zero-length transfers for mt8183")
> Signed-off-by: Fabien Parent <fparent@...libre.com>
> Reviewed-by: Cengiz Can <cengiz@...nel.wtf>
> Reviewed-by: Hsin-Yi Wang <hsinyi@...omium.org>
> Tested-by: Ulrich Hecht <uli@...nd.eu>
> 

Applied to for-current, thanks!


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