linux-kernel - Re: [PATCH] spi: bitbang: Fix NULL pointer dereference in spi_unregister

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Message-ID: <CAFRkauCSzkuNUugsfGY8jvcy-2hd-LfkuerJi56V3OM6oHu3yw@mail.gmail.com>
Date:   Thu, 16 May 2019 16:36:59 +0800
From:   Axel Lin <axel.lin@...ics.com>
To:     YueHaibing <yuehaibing@...wei.com>
Cc:     Mark Brown <broonie@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-spi <linux-spi@...r.kernel.org>,
        Alban Bedel <albeu@...e.fr>, lorenzo.bianconi@...hat.com
Subject: Re: [PATCH] spi: bitbang: Fix NULL pointer dereference in spi_unregister_master

YueHaibing <yuehaibing@...wei.com> 於 2019年5月16日 週四 下午3:57寫道：
>
> If spi_register_master fails in spi_bitbang_start
> because device_add failure, We should return the
> error code other than 0, otherwise calling
> spi_bitbang_stop may trigger NULL pointer dereference
> like this:

Reviewed-by: Axel Lin <axel.lin@...ics.com>