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    Subject[PATCH 5.15 211/913] crypto: ccree - dont attempt 0 len DMA mappings
    Date
    From: Gilad Ben-Yossef <gilad@benyossef.com>

    [ Upstream commit 1fb37b5692c915edcc2448a6b37255738c7c77e0 ]

    Refuse to try mapping zero bytes as this may cause a fault
    on some configurations / platforms and it seems the prev.
    attempt is not enough and we need to be more explicit.

    Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
    Reported-by: Corentin Labbe <clabbe.montjoie@gmail.com>
    Fixes: ce0fc6db38de ("crypto: ccree - protect against empty or NULL
    scatterlists")
    Tested-by: Corentin Labbe <clabbe.montjoie@gmail.com>
    Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/crypto/ccree/cc_buffer_mgr.c | 7 +++++++
    1 file changed, 7 insertions(+)

    diff --git a/drivers/crypto/ccree/cc_buffer_mgr.c b/drivers/crypto/ccree/cc_buffer_mgr.c
    index a5e041d9d2cf..11e0278c8631 100644
    --- a/drivers/crypto/ccree/cc_buffer_mgr.c
    +++ b/drivers/crypto/ccree/cc_buffer_mgr.c
    @@ -258,6 +258,13 @@ static int cc_map_sg(struct device *dev, struct scatterlist *sg,
    {
    int ret = 0;

    + if (!nbytes) {
    + *mapped_nents = 0;
    + *lbytes = 0;
    + *nents = 0;
    + return 0;
    + }
    +
    *nents = cc_get_sgl_nents(dev, sg, nbytes, lbytes);
    if (*nents > max_sg_nents) {
    *nents = 0;
    --
    2.34.1


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