crypto: virtio: Fix src/dst scatterlist calculation in __virtio_crypto_skcipher_do_req()
commit b02989f3 upstream. The system will crash when the users insmod crypto/tcrypt.ko with mode=38 ( testing "cts(cbc(aes))" ). Usually the next entry of one sg will be @sg@ + 1, but if this sg element is part of a chained scatterlist, it could jump to the start of a new scatterlist array. Fix it by sg_next() on calculation of src/dst scatterlist. Fixes: dbaf0624 ("crypto: add virtio-crypto driver") Reported-by:LABBE Corentin <clabbe@baylibre.com> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: Jason Wang <jasowang@redhat.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: virtualization@lists.linux-foundation.org Cc: linux-kernel@vger.kernel.org Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20200123101000.GB24255@Red Signed-off-by:
Gonglei <arei.gonglei@huawei.com> Signed-off-by:
Longpeng(Mike) <longpeng2@huawei.com> Link: https://lore.kernel.org/r/20200602070501.2023-2-longpeng2@huawei.com Signed-off-by:
Michael S. Tsirkin <mst@redhat.com> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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