On Thursday 02 July 2015 01:34 PM, Felipe Balbi wrote:
> On Thu, Jul 02, 2015 at 10:48:36AM +0530, Lokesh Vutla wrote:
>> Its not necessary that assoc data and plain text is passed always.
>> Add these checks before processing the input.
>>
>> Signed-off-by: Lokesh Vutla <lokeshvutla@xxxxxx>
>
> why can't this be combined with patch which added GCM in the first
> place ?
Yes, my initial patch is all combined. But it was very big.
I tried my best in breaking down into different patches inorder to
help reviewer.
So, I kept the functionality part in one patch, and handled corner case
like these in separate patches.
Thanks and regards,
Lokesh
>
>> ---
>> drivers/crypto/omap-aes-gcm.c | 26 ++++++++++++++++++++------
>> 1 file changed, 20 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/crypto/omap-aes-gcm.c b/drivers/crypto/omap-aes-gcm.c
>> index 1be9d91..72815af 100644
>> --- a/drivers/crypto/omap-aes-gcm.c
>> +++ b/drivers/crypto/omap-aes-gcm.c
>> @@ -87,7 +87,7 @@ static int omap_aes_gcm_copy_buffers(struct omap_aes_dev *dd,
>> struct aead_request *req)
>> {
>> void *buf_in;
>> - int alen, clen;
>> + int alen, clen, nsg;
>> struct crypto_aead *aead = crypto_aead_reqtfm(req);
>> unsigned int authlen = crypto_aead_authsize(aead);
>> u32 dec = !(dd->flags & FLAGS_ENCRYPT);
>> @@ -97,12 +97,18 @@ static int omap_aes_gcm_copy_buffers(struct omap_aes_dev *dd,
>>
>> dd->sgs_copied = 0;
>>
>> - sg_init_table(dd->in_sgl, 2);
>> - buf_in = sg_virt(req->assoc);
>> - sg_set_buf(dd->in_sgl, buf_in, alen);
>> + nsg = 1 + !!(req->assoclen && req->cryptlen);
>>
>> - buf_in = sg_virt(req->src);
>> - sg_set_buf(&dd->in_sgl[1], buf_in, clen);
>> + sg_init_table(dd->in_sgl, nsg);
>> + if (req->assoclen) {
>> + buf_in = sg_virt(req->assoc);
>> + sg_set_buf(dd->in_sgl, buf_in, alen);
>> + }
>> +
>> + if (req->cryptlen) {
>> + buf_in = sg_virt(req->src);
>> + sg_set_buf(&dd->in_sgl[nsg - 1], buf_in, clen);
>> + }
>>
>> dd->in_sg = dd->in_sgl;
>> dd->total = clen;
>> @@ -258,6 +264,8 @@ static int omap_aes_gcm_crypt(struct aead_request *req, unsigned long mode)
>> {
>> struct omap_aes_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
>> struct omap_aes_reqctx *rctx = aead_request_ctx(req);
>> + struct crypto_aead *aead = crypto_aead_reqtfm(req);
>> + unsigned int authlen = crypto_aead_authsize(aead);
>> struct omap_aes_dev *dd;
>> __be32 counter = cpu_to_be32(1);
>> int err;
>> @@ -270,6 +278,12 @@ static int omap_aes_gcm_crypt(struct aead_request *req, unsigned long mode)
>> if (err)
>> return err;
>>
>> + if (req->assoclen + req->cryptlen == 0) {
>> + scatterwalk_map_and_copy(ctx->auth_tag, req->dst, 0, authlen,
>> + 1);
>> + return 0;
>> + }
>> +
>> dd = omap_aes_find_dev(ctx);
>> if (!dd)
>> return -ENODEV;
>> --
>> 1.7.9.5
>>
>> --
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