Patchwork [3.11,162/208] crypto: scatterwalk - Set the chain pointer indication bit

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Submitter Luis Henriques
Date Dec. 19, 2013, 11:54 a.m.
Message ID <1387454106-19326-163-git-send-email-luis.henriques@canonical.com>
Download mbox | patch
Permalink /patch/303468/
State New
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Luis Henriques - Dec. 19, 2013, 11:54 a.m.
3.11.10.2 -stable review patch.  If anyone has any objections, please let me know.

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

From: Tom Lendacky <thomas.lendacky@amd.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@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
---
 include/crypto/scatterwalk.h | 1 +
 1 file changed, 1 insertion(+)

Patch

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)