linux-kernel - [PATCH 3.12 09/62] crypto: scatterwalk - Set the chain pointer indication bit

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Message-Id: <20131210080058.105459090@linuxfoundation.org>
Date:	Tue, 10 Dec 2013 00:00:40 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Tom Lendacky <thomas.lendacky@....com>,
	Herbert Xu <herbert@...dor.apana.org.au>
Subject: [PATCH 3.12 09/62] crypto: scatterwalk - Set the chain pointer indication bit

3.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Tom Lendacky <thomas.lendacky@....com>

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@....com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 include/crypto/scatterwalk.h |    1 +
 1 file changed, 1 insertion(+)

--- a/include/crypto/scatterwalk.h
+++ b/include/crypto/scatterwalk.h
@@ -36,6 +36,7 @@ static inline void scatterwalk_sg_chain(
 {
 	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)


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