linux-kernel - Re: [PATCH] scsi: mpt2sas: mpt2sas_base.c: Fix for possible null pointer dereference

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Date:	Wed, 28 May 2014 04:26:28 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
Cc:	Nagalakshmi Nandigama <Nagalakshmi.Nandigama@....com>,
	Sreekanth Reddy <Sreekanth.Reddy@....com>, support@....com,
	"James E.J. Bottomley" <JBottomley@...allels.com>,
	DL-MPTFusionLinux@....com, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scsi: mpt2sas: mpt2sas_base.c:  Fix for possible null
 pointer dereference

> -	ioc_status = le16_to_cpu(mpi_reply->IOCStatus) & MPI2_IOCSTATUS_MASK;
> +	if (mpi_reply) {
> +		ioc_status = le16_to_cpu(mpi_reply->IOCStatus) & MPI2_IOCSTATUS_MASK;
> +	}
>  
>  	if (ioc_status != MPI2_IOCSTATUS_SUCCESS)
>  		ioc->port_enable_failed = 1;

ioc_status isn't initialized without the reply and used here as well
as later in the function.  I think we'll need input from LSI or others
with the spec on what to do when we didn't get a reply.

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