linux-kernel - Re: [BUG] scsi_device.device == NULL in sd_revalidate

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Message-ID: <CA+5PVA4axkm-S5-E1pnkgNpDLy3DHegFL2Cfo2i-8HOsfGMHDw@mail.gmail.com>
Date:	Mon, 5 Mar 2012 19:02:08 -0500
From:	Josh Boyer <jwboyer@...il.com>
To:	Fengguang Wu <fengguang.wu@...el.com>
Cc:	"linux-fsdevel@...r.kernel.o..." <linux-fsdevel@...r.kernel.org>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] scsi_device.device == NULL in sd_revalidate_disk()

On Mon, Mar 5, 2012 at 6:41 PM, Fengguang Wu <fengguang.wu@...el.com> wrote:
> Hi,
>
> I ran into a NULL dereference bug on USB key hot remove, which should
> be caused by the below skdp->device reference
>
>        static int sd_revalidate_disk(struct gendisk *disk)
>        {
>                struct scsi_disk *sdkp = scsi_disk(disk);
> ==>             struct scsi_device *sdp = sdkp->device;

This has been reported numerous times.  There are patches to the block layer
that are supposed to fix it, but they haven't hit Linus' tree yet.  I think
we're waiting on Jens to push them.

josh
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