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    Subject[PATCH 05/22] crypto: powerpc/aes-spe - 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: Benjamin Herrenschmidt <benh@kernel.crashing.org>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: Michael Ellerman <mpe@ellerman.id.au>
    Signed-off-by: Andrei Botila <andrei.botila@nxp.com>
    ---
    arch/powerpc/crypto/aes-spe-glue.c | 6 ++++++
    1 file changed, 6 insertions(+)

    diff --git a/arch/powerpc/crypto/aes-spe-glue.c b/arch/powerpc/crypto/aes-spe-glue.c
    index c2b23b69d7b1..f37d8bef322b 100644
    --- a/arch/powerpc/crypto/aes-spe-glue.c
    +++ b/arch/powerpc/crypto/aes-spe-glue.c
    @@ -327,6 +327,9 @@ static int ppc_xts_encrypt(struct skcipher_request *req)
    u8 b[2][AES_BLOCK_SIZE];
    int err;

    + if (!req->cryptlen)
    + return 0;
    +
    if (req->cryptlen < AES_BLOCK_SIZE)
    return -EINVAL;

    @@ -366,6 +369,9 @@ static int ppc_xts_decrypt(struct skcipher_request *req)
    le128 twk;
    int err;

    + if (!req->cryptlen)
    + return 0;
    +
    if (req->cryptlen < AES_BLOCK_SIZE)
    return -EINVAL;

    --
    2.17.1
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