linux-kernel - please fix FUSION (Was: [v3.13][v3.14][Regression] kthread:makekthread

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Date:	Wed, 19 Mar 2014 19:29:10 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Joseph Salisbury <joseph.salisbury@...onical.com>
Cc:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	JBottomley@...allels.com, Nagalakshmi.Nandigama@....com,
	Sreekanth.Reddy@....com, rientjes@...gle.com,
	akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
	tj@...nel.org, tglx@...utronix.de, linux-kernel@...r.kernel.org,
	kernel-team@...ts.ubuntu.com, linux-scsi@...r.kernel.org
Subject: please fix FUSION (Was: [v3.13][v3.14][Regression]
	kthread:makekthread_create()killable)

On 03/19, Oleg Nesterov wrote:
>
> But please do not forget that the kernel crashes. Whatever else we do, this
> should be fixed anyway. And this should be fixed in driver.

drivers/message/fusion/ is obviously buggy.

mptsas_probe() does

		sh = scsi_host_alloc(...);
		if (!sh) {
			...
			goto out_mptsas_probe;
		}
		...
	out_mptsas_probe:
		mptscsih_remove(pdev);

and mptscsih_remove() blindly calls scsi_remove_host(ioc->sh) but ->sh
was not initialized, probably it is NULL.

and scsi_remove_host(host) obviously assumes that this pointer is valid.

I think we should wait for maintainers.

Oleg.

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