[dpdk-dev] [dpdk-stable] [PATCH] crypto/qat: fix uninitilized compiler warning
David Marchand
david.marchand at redhat.com
Fri May 14 10:13:41 CEST 2021
On Fri, May 14, 2021 at 10:01 AM Feifei Wang <Feifei.Wang2 at 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
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