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    Subject[PATCH 3.12 09/62] crypto: scatterwalk - Set the chain pointer indication bit
    Date
    3.12-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: Greg Kroah-Hartman <gregkh@linuxfoundation.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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