linux-kernel - Re: [PATCH] crypto/hisilicon: Add null judgment to the callback interface

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Message-ID: <32686c5b-04b2-7103-bf2e-113db2315ef4@huawei.com>
Date:   Thu, 10 Nov 2022 10:03:53 +0800
From:   liulongfang <liulongfang@...wei.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>
CC:     <wangzhou1@...ilicon.com>, <linux-crypto@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] crypto/hisilicon: Add null judgment to the callback
 interface

On 2022/11/9 17:18, Herbert Xu wrote:
> On Wed, Nov 09, 2022 at 02:21:11PM +0800, liulongfang wrote:
>>
>> The trigger method is to not call the function skcipher_request_set_callback()
>> when using the skcipher interface for encryption and decryption services.
> 
> Yes but which function exactly? Please give the exact call path
> leading to this crash.
> 

This problem occurs in the application code of the encryption usage scenario
(unfortunately, these codes are not open to the public and cannot be given to you),
but its code logic is similar to test_skcipher_vec_cfg() in kernel\crypto\testmgr.c,
and it is also in accordance with this call logic execution:
crypto_alloc_skcipher()--->skcipher_request_alloc()--->crypto_skcipher_setkey()--->
sg_init_table()--->skcipher_request_set_crypt()--->
crypto_skcipher_encrypt()/crypto_skcipher_decrypt()--->
skcipher_request_free()--->crypto_free_skcipher()

Just don't add "wait" and skcipher_request_set_callback(),
use it as a synchronous mode.

Thanks
Longfang.
> Cheers,
>