Re: [PATCH v1 3/8] crypto:chcr- Fix key length for RFC4106

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On 12-01-2017 21:39, Herbert Xu wrote:
> On Fri, Jan 06, 2017 at 02:01:34PM +0530, Harsh Jain wrote:
>> Check keylen before copying salt to avoid wrap around of Integer.
>>
>> Signed-off-by: Harsh Jain <harsh@xxxxxxxxxxx>
>> ---
>>  drivers/crypto/chelsio/chcr_algo.c | 4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/crypto/chelsio/chcr_algo.c b/drivers/crypto/chelsio/chcr_algo.c
>> index deec7c0..6c2dea3 100644
>> --- a/drivers/crypto/chelsio/chcr_algo.c
>> +++ b/drivers/crypto/chelsio/chcr_algo.c
>> @@ -2194,8 +2194,8 @@ static int chcr_gcm_setkey(struct crypto_aead *aead, const u8 *key,
>>  	unsigned int ck_size;
>>  	int ret = 0, key_ctx_size = 0;
>>  
>> -	if (get_aead_subtype(aead) ==
>> -	    CRYPTO_ALG_SUB_TYPE_AEAD_RFC4106) {
>> +	if (get_aead_subtype(aead) == CRYPTO_ALG_SUB_TYPE_AEAD_RFC4106 &&
>> +	    keylen > 3) {
>>  		keylen -= 4;  /* nonce/salt is present in the last 4 bytes */
>>  		memcpy(aeadctx->salt, key + keylen, 4);
>>  	}
> We should return an error in this case.
That case is already handled in next if condition.It will error out with -EINVAL in next condition.

if (keylen == AES_KEYSIZE_128) {

>
> Cheers,

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