linux-kernel - Re: Fix ccp_run_passthru_cmd dma variable assignments

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Message-ID: <52E2CA48.4070500@amd.com>
Date:	Fri, 24 Jan 2014 14:17:12 -0600
From:	Tom Lendacky <thomas.lendacky@....com>
To:	Dave Jones <davej@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	<herbert@...dor.apana.org.au>, <linux-crypto@...r.kernel.org>
Subject: Re: Fix ccp_run_passthru_cmd dma variable assignments

On 01/24/2014 12:39 PM, Dave Jones wrote:
> There are some suspicious looking lines of code in the new ccp driver, including
> one that assigns a variable to itself, and another that overwrites a previous assignment.
> 
> This may have been a cut-and-paste error where 'src' was forgotten to be changed to 'dst'.
> I have no hardware to test this, so this is untested.

Yes, this was a cut-and-paste error that was not discovered with my tests. I've
updated my testcases and tested/verified this fix.

Herbert, this should probably go through the cryptodev-2.6 tree right?

Acked-by: Tom Lendacky <thomas.lendacky@....com>

Thanks,
Tom

> 
> Signed-off-by: Dave Jones <davej@...oraproject.org>
> 
> diff --git a/drivers/crypto/ccp/ccp-ops.c b/drivers/crypto/ccp/ccp-ops.c
> index 71ed3ade7e12..c266a7b154bb 100644
> --- a/drivers/crypto/ccp/ccp-ops.c
> +++ b/drivers/crypto/ccp/ccp-ops.c
> @@ -1666,8 +1666,8 @@ static int ccp_run_passthru_cmd(struct ccp_cmd_queue *cmd_q,
>   
>   		op.dst.type = CCP_MEMTYPE_SYSTEM;
>   		op.dst.u.dma.address = sg_dma_address(dst.sg_wa.sg);
> -		op.src.u.dma.offset = dst.sg_wa.sg_used;
> -		op.src.u.dma.length = op.src.u.dma.length;
> +		op.dst.u.dma.offset = dst.sg_wa.sg_used;
> +		op.dst.u.dma.length = op.src.u.dma.length;
>   
>   		ret = ccp_perform_passthru(&op);
>   		if (ret) {
> 

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