[PATCH 3.2 105/185] crypto: scatterwalk - Set the chain pointerindication bit

From: Ben Hutchings
Date: Sat Dec 28 2013 - 21:45:44 EST

3.2.54-rc1 review patch. If anyone has any objections, please let me know.


From: Tom Lendacky <thomas.lendacky@xxxxxxx>

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@xxxxxxx>
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
include/crypto/scatterwalk.h | 1 +
1 file changed, 1 insertion(+)

--- a/include/crypto/scatterwalk.h
+++ b/include/crypto/scatterwalk.h
@@ -58,6 +58,7 @@ 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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