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Add a comment for the added cast with explanation.

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Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
This commit is contained in:
Tomas Mraz 2016-08-10 15:21:32 +02:00 committed by Matt Caswell
parent 3f8d1216df
commit e7e5d608fb
1 changed files with 4 additions and 0 deletions
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4
engines/afalg/e_afalg.c
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@ -230,6 +230,10 @@ int afalg_fin_cipher_aio(afalg_aio *aio, int sfd, unsigned char *buf,
memset(cb, '\0', sizeof(*cb));
cb->aio_fildes = sfd;
cb->aio_lio_opcode = IOCB_CMD_PREAD;
/*
* The pointer has to be converted to unsigned value first to avoid
* sign extension on cast to 64 bit value
*/
cb->aio_buf = (uint64_t)(unsigned long)buf;
cb->aio_offset = 0;
cb->aio_data = 0;