linux-kernel - [PATCH 02/10] crypto: scatterwalk - Set the chain pointer indication bit

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Message-ID: <20131112174610.19746.91705.stgit@tlendack-t1.amdoffice.net>
Date:	Tue, 12 Nov 2013 11:46:10 -0600
From:	Tom Lendacky <thomas.lendacky@....com>
To:	<davem@...emloft.net>, <linux-crypto@...r.kernel.org>,
	<herbert@...dor.apana.org.au>
CC:	<linux-kernel@...r.kernel.org>
Subject: [PATCH 02/10] crypto: scatterwalk - Set the chain pointer indication
 bit

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

diff --git a/include/crypto/scatterwalk.h b/include/crypto/scatterwalk.h
index 13621cc..64ebede 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)


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