[3.8.y.z extended stable] Patch "crypto: scatterwalk - Set the chain pointer indication bit" has been added to staging queue

[Kamal Mostafa]

On Fri, 2013-12-20 at 20:35 +0000, Lendacky, Thomas wrote:
> Hi Kamal,
> 
> Please also include the patch with commit id of 389a5390583a18e45bc4abd4439291abec5e7a63.  It fixes a BUG_ON caused by the below patch when CONFIG_DEBUG_SG is enabled.


Thanks Tom -- queued up that one for 3.8 too.

 -Kamal


> Thanks,
> Tom
> 
> -----Original Message-----
> From: Kamal Mostafa [mailto:kamal at canonical.com] 
> Sent: Friday, December 20, 2013 2:21 PM
> To: Lendacky, Thomas
> Cc: Herbert Xu; Kamal Mostafa; kernel-team at lists.ubuntu.com
> Subject: [3.8.y.z extended stable] Patch "crypto: scatterwalk - Set the chain pointer indication bit" has been added to staging queue
> 
> This is a note to let you know that I have just added a patch titled
> 
>     crypto: scatterwalk - Set the chain pointer indication bit
> 
> to the linux-3.8.y-queue branch of the 3.8.y.z extended stable tree which can be found at:
> 
>  http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.8.y-queue
> 
> This patch is scheduled to be released in version 3.8.13.15.
> 
> If you, or anyone else, feels it should not be added to this tree, please reply to this email.
> 
> For more information about the 3.8.y.z tree, see https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable
> 
> Thanks.
> -Kamal
> 
> ------
> 
> From ef845ea48f30c4475934b9e71b5ca3186719e458 Mon Sep 17 00:00:00 2001
> From: Tom Lendacky <thomas.lendacky at amd.com>
> Date: Tue, 12 Nov 2013 11:46:10 -0600
> Subject: crypto: scatterwalk - Set the chain pointer indication bit
> 
> commit 41da8b5adba77e22584f8b45f9641504fa885308 upstream.
> 
> The scatterwalk_crypto_chain function invokes the scatterwalk_sg_chain function to chain two scatterlists, but the chain pointer indication bit is not set.  When the resulting scatterlist is used, for example, by sg_nents to count the number of scatterlist entries, a segfault occurs because sg_nents does not follow the chain pointer to the chained scatterlist.
> 
> Update scatterwalk_sg_chain to set the chain pointer indication bit as is done by the sg_chain function.
> 
> Signed-off-by: Tom Lendacky <thomas.lendacky at amd.com>
> Signed-off-by: Herbert Xu <herbert at gondor.apana.org.au>
> Signed-off-by: Kamal Mostafa <kamal at canonical.com>
> ---
>  include/crypto/scatterwalk.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/include/crypto/scatterwalk.h b/include/crypto/scatterwalk.h index 3744d2a..09ef1a0 100644
> --- a/include/crypto/scatterwalk.h
> +++ b/include/crypto/scatterwalk.h
> @@ -36,6 +36,7 @@ static inline void scatterwalk_sg_chain(struct scatterlist *sg1, int num,  {
>  	sg_set_page(&sg1[num - 1], (void *)sg2, 0, 0);
>  	sg1[num - 1].page_link &= ~0x02;
> +	sg1[num - 1].page_link |= 0x01;
>  }
> 
>  static inline struct scatterlist *scatterwalk_sg_next(struct scatterlist *sg)
> --
> 1.8.3.2
> 
> 
> 

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