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SubjectRe: [PATCH v2 1/2] crypto: virtio: Fix src/dst scatterlist calculation in __virtio_crypto_skcipher_do_req()
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Hi Markus,

On 2020/5/26 15:03, Markus Elfring wrote:
>> Fix it by sg_next() on calculation of src/dst scatterlist.
>
> Wording adjustment:
> … by calling the function “sg_next” …
>
OK, thanks.

>
> …
>> +++ b/drivers/crypto/virtio/virtio_crypto_algs.c
>> @@ -350,13 +350,18 @@ __virtio_crypto_skcipher_do_req(struct virtio_crypto_sym_request *vc_sym_req,
> …
>> src_nents = sg_nents_for_len(req->src, req->cryptlen);
>> + if (src_nents < 0) {
>> + pr_err("Invalid number of src SG.\n");
>> + return src_nents;
>> + }
>> +
>> dst_nents = sg_nents(req->dst);
> …
>
> I suggest to move the addition of such input parameter validation
> to a separate update step.
>
Um...The 'src_nents' will be used as a loop condition, so validate it here is
needed ?

'''
/* Source data */
- for (i = 0; i < src_nents; i++)
- sgs[num_out++] = &req->src[i];
+ for (sg = req->src; src_nents; sg = sg_next(sg), src_nents--)
+ sgs[num_out++] = sg;
'''

> Regards,
> Markus
>

--
---
Regards,
Longpeng(Mike)

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