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    Subject[PATCH AUTOSEL 4.19 078/206] crypto: chelsio - This fixes the kernel panic which occurs during a libkcapi test
    Date
    From: Ayush Sawal <ayush.sawal@chelsio.com>

    [ Upstream commit 9195189e00a7db55e7d448cee973cae87c5a3c71 ]

    The libkcapi test which causes kernel panic is
    aead asynchronous vmsplice multiple test.

    ./bin/kcapi -v -d 4 -x 10 -c "ccm(aes)"
    -q 4edb58e8d5eb6bc711c43a6f3693daebde2e5524f1b55297abb29f003236e43d
    -t a7877c99 -n 674742abd0f5ba -k 2861fd0253705d7875c95ba8a53171b4
    -a fb7bc304a3909e66e2e0c5ef952712dd884ce3e7324171369f2c5db1adc48c7d

    This patch avoids dma_mapping of a zero length sg which causes the panic,
    by using sg_nents_for_len which maps only upto a specific length

    Signed-off-by: Ayush Sawal <ayush.sawal@chelsio.com>
    Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/crypto/chelsio/chcr_algo.c | 5 +++--
    1 file changed, 3 insertions(+), 2 deletions(-)

    diff --git a/drivers/crypto/chelsio/chcr_algo.c b/drivers/crypto/chelsio/chcr_algo.c
    index 9b3c259f081d3..ee508bbbb7504 100644
    --- a/drivers/crypto/chelsio/chcr_algo.c
    +++ b/drivers/crypto/chelsio/chcr_algo.c
    @@ -2418,8 +2418,9 @@ int chcr_aead_dma_map(struct device *dev,
    else
    reqctx->b0_dma = 0;
    if (req->src == req->dst) {
    - error = dma_map_sg(dev, req->src, sg_nents(req->src),
    - DMA_BIDIRECTIONAL);
    + error = dma_map_sg(dev, req->src,
    + sg_nents_for_len(req->src, dst_size),
    + DMA_BIDIRECTIONAL);
    if (!error)
    goto err;
    } else {
    --
    2.25.1
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