linux-kernel - Re: [PATCH 1/1] scsi: scsi_transport_fc: Fix a bug in the error handling function

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Date:	Thu, 07 Jan 2016 15:48:31 -0800
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	"K. Y. Srinivasan" <kys@...rosoft.com>, gregkh@...uxfoundation.org,
	linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
	ohering@...e.com, jbottomley@...allels.com, hch@...radead.org,
	linux-scsi@...r.kernel.org, apw@...onical.com, vkuznets@...hat.com,
	jasowang@...hat.com, martin.petersen@...cle.com, hare@...e.de
Cc:	stable@...r.kernel.org
Subject: Re: [PATCH 1/1] scsi: scsi_transport_fc: Fix a bug in the error
 handling function

On Thu, 2016-01-07 at 16:40 -0800, K. Y. Srinivasan wrote:
> The macro startget_to_rport() can return NULL; handle that case
> properly.

OK, can we unwind why you think you could possibly need this?  It would
mean that fc_timed_out was called for a non-FC device, which was
thought to be an impossibility when the fc transport class was
designed.

James

> Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
> Cc: <stable@...r.kernel.org>
> ---
>  drivers/scsi/scsi_transport_fc.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/scsi/scsi_transport_fc.c
> b/drivers/scsi/scsi_transport_fc.c
> index 24eaaf6..42a908f 100644
> --- a/drivers/scsi/scsi_transport_fc.c
> +++ b/drivers/scsi/scsi_transport_fc.c
> @@ -2081,7 +2081,7 @@ fc_timed_out(struct scsi_cmnd *scmd)
>  {
>  	struct fc_rport *rport = starget_to_rport(scsi_target(scmd
> ->device));
>  
> -	if (rport->port_state == FC_PORTSTATE_BLOCKED)
> +	if ((rport == NULL) || (rport->port_state ==
> FC_PORTSTATE_BLOCKED))
>  		return BLK_EH_RESET_TIMER;
>  
>  	return BLK_EH_NOT_HANDLED;