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From: David Marchand <david.marchand@redhat.com>
To: Feifei Wang <Feifei.Wang2@arm.com>
Cc: John Griffin <john.griffin@intel.com>,
	Fiona Trahe <fiona.trahe@intel.com>,
	Deepak Kumar Jain <deepak.k.jain@intel.com>,
	Herbert Guan <Herbert.Guan@arm.com>,
	 Jerin Jacob <jerin.jacob@caviumnetworks.com>, dev <dev@dpdk.org>,
	nd <nd@arm.com>,  dpdk stable <stable@dpdk.org>,
	Ruifeng Wang <Ruifeng.Wang@arm.com>
Subject: Re: [dpdk-dev] [dpdk-stable] [PATCH] crypto/qat: fix uninitilized compiler warning
Date: Fri, 14 May 2021 10:13:41 +0200	[thread overview]
Message-ID: <CAJFAV8yG5nkAXBfnF_SCvjKGCZQoe4MWH93=YbK9QXkO+yruVA@mail.gmail.com> (raw)
In-Reply-To: <DB9PR08MB6923A51882A6C2D3594FA1E9C8509@DB9PR08MB6923.eurprd08.prod.outlook.com>

On Fri, May 14, 2021 at 10:01 AM Feifei Wang <Feifei.Wang2@arm.com> wrote:
> > > @@ -1190,8 +1190,8 @@ static int partial_hash_compute(enum
> > icp_qat_hw_auth_algo hash_alg,
> > >                         uint8_t *data_out)  {
> > >         int digest_size;
> > > -       uint8_t digest[qat_hash_get_digest_size(
> > > -                       ICP_QAT_HW_AUTH_ALGO_DELIMITER)];
> > > +       uint8_t *digest = (uint8_t *)calloc(qat_hash_get_digest_size(
> > > +                               ICP_QAT_HW_AUTH_ALGO_DELIMITER),
> > > + sizeof(uint8_t));
> >
> > calloc can fail.
> > cast is unneded.
> >
> > A simple uint8_t digest[...] = { 0 } would do the job.
>
> Thanks for your comment. Actually, we have tried to use this simple method:
>  uint8_t digest[qat_hash_get_digest_size(ICP_QAT_HW_AUTH_ALGO_DELIMITER)] = {0};
>
> And it will report compile error:
> ../drivers/crypto/qat/qat_sym_session.c:1194:4: error: variable-sized object may not be initialized
>  1194 |    ICP_QAT_HW_AUTH_ALGO_DELIMITER)] = {0};
>       |    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> ../drivers/crypto/qat/qat_sym_session.c:1194:40: warning: excess elements in array initializer
>  1194 |    ICP_QAT_HW_AUTH_ALGO_DELIMITER)] = {0};
>       |                                        ^
> ../drivers/crypto/qat/qat_sym_session.c:1194:40: note: (near initialization for ‘digest’)
> ninja: build stopped: subcommand failed.
>
> I think this is because compiler cannot know the size of digest due to function
> 'qat_hash_get_digest_size' during  compiling time.

Ok, I had not noticed the function call.

Please check dynamic allocation succeeds.
+ free this temp buffer before leaving this helper function.


-- 
David marchand


  reply	other threads:[~2021-05-14  8:13 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-14  7:41 [dpdk-dev] " Feifei Wang
2021-05-14  7:49 ` [dpdk-dev] [dpdk-stable] " David Marchand
2021-05-14  8:01   ` [dpdk-dev] 回复: " Feifei Wang
2021-05-14  8:13     ` David Marchand [this message]
2021-05-14  8:30       ` Feifei Wang
2021-05-17  9:07 ` [dpdk-dev] [PATCH v3] " Feifei Wang
2021-05-19  7:56   ` [dpdk-dev] [dpdk-stable] " Thomas Monjalon
2021-05-19  8:11   ` Ferruh Yigit
2021-05-20  5:44     ` [dpdk-dev] 回复: " Feifei Wang
2021-05-20  8:08       ` Ferruh Yigit
2021-05-19 13:13   ` [dpdk-dev] " Dybkowski, AdamX
2021-05-19 13:16   ` Dybkowski, AdamX
2021-05-20  5:47     ` [dpdk-dev] 回复: " Feifei Wang
2021-05-20  8:43 ` [dpdk-dev] [PATCH v4] crypto/qat: fix uninitilized gcc " Feifei Wang
2021-05-20  9:06   ` Dybkowski, AdamX
2021-05-21  2:00 ` [dpdk-dev] [PATCH v5] crypto/qat: fix uninitialized " Feifei Wang
2021-06-29 20:04   ` [dpdk-dev] [EXT] " Akhil Goyal

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