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    Subject[PATCH 07/22] crypto: s390/paes - add check for xts input length equal to zero
    Date
    From: Andrei Botila <andrei.botila@nxp.com>

    Standardize the way input lengths equal to 0 are handled in all skcipher
    algorithms. All the algorithms return 0 for input lengths equal to zero.

    Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
    Cc: Vasily Gorbik <gor@linux.ibm.com>
    Cc: Christian Borntraeger <borntraeger@de.ibm.com>
    Signed-off-by: Andrei Botila <andrei.botila@nxp.com>
    ---
    arch/s390/crypto/paes_s390.c | 3 +++
    1 file changed, 3 insertions(+)

    diff --git a/arch/s390/crypto/paes_s390.c b/arch/s390/crypto/paes_s390.c
    index f3caeb17c85b..7f0861c6f019 100644
    --- a/arch/s390/crypto/paes_s390.c
    +++ b/arch/s390/crypto/paes_s390.c
    @@ -494,6 +494,9 @@ static int xts_paes_crypt(struct skcipher_request *req, unsigned long modifier)
    u8 init[16];
    } xts_param;

    + if (!req->cryptlen)
    + return 0;
    +
    ret = skcipher_walk_virt(&walk, req, false);
    if (ret)
    return ret;
    --
    2.17.1
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