linux-kernel - Re: [PATCH 03/11] target: fail REPORT LUNS with less than 16 bytes of payload

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Date:	Fri, 07 Sep 2012 11:09:37 -0700
From:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	linux-kernel@...r.kernel.org, target-devel@...r.kernel.org,
	hch@....de, roland@...nel.org
Subject: Re: [PATCH 03/11] target: fail REPORT LUNS with less than 16 bytes
 of payload

On Fri, 2012-09-07 at 17:30 +0200, Paolo Bonzini wrote:
> SPC says:
> 
> "The ALLOCATION LENGTH field is defined in 4.3.5.6. The allocation length
> should be at least 16.  Device servers compliant with SPC return CHECK
> CONDITION status, with the sense key set to ILLEGAL REQUEST, and the
> additional sense code set to INVALID FIELD IN CDB when the allocation
> length is less than 16 bytes".
> 
> Testcase: sg_raw -r8 /dev/sdb a0 00 00 00 00 00 00 00 00 08 00 00
>     should fail with ILLEGAL REQUEST / INVALID FIELD IN CDB sense
>     does not fail without the patch
>     fails correctly with the patch
> 
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> ---

Looks good.  Applied to master.

Thanks Paolo!

>  drivers/target/target_core_device.c |    7 +++++++
>  1 files changed, 7 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c
> index cf2c66f..9fc9a60 100644
> --- a/drivers/target/target_core_device.c
> +++ b/drivers/target/target_core_device.c
> @@ -669,6 +669,13 @@ int target_report_luns(struct se_cmd *se_cmd)
>  	unsigned char *buf;
>  	u32 lun_count = 0, offset = 8, i;
>  
> +	if (se_cmd->data_length < 16) {
> +		pr_warn("REPORT LUNS allocation length %u too small\n",
> +			se_cmd->data_length);
> +		se_cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
> +		return -EINVAL;
> +	}
> +
>  	buf = transport_kmap_data_sg(se_cmd);
>  	if (!buf)
>  		return -ENOMEM;


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