linux-kernel - Re: [PATCH] st: fix race in st_scsi_execute

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Message-ID: <1332324581.2909.38.camel@dabdike.int.hansenpartnership.com>
Date:	Wed, 21 Mar 2012 10:09:41 +0000
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Petr Uzel <petr.uzel@...e.cz>
Cc:	linux-kernel@...r.kernel.org, Willem Riede <osst@...de.org>,
	jack@...e.cz, linux-scsi@...r.kernel.org,
	juergen.gross@...fujitsu.com
Subject: Re: [PATCH] st: fix race in st_scsi_execute_end

On Fri, 2011-10-21 at 13:31 +0200, Petr Uzel wrote:
> The call to complete() in st_scsi_execute_end() wakes up sleeping thread
> in write_behind_check(), which frees the st_request, thus invalidating
> the pointer to the associated bio structure, which is then passed to the
> blk_rq_unmap_user(). Fix by storing pointer to bio structure into
> temporary local variable.
> 
> This bug is present since at least linux-2.6.32.

This patch isn't applyable.  That's because gpg has mangled it.  You
either need to turn it off or do detached signatures.

Thanks,

James


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