[PATCH] crypto/qat: fix stack buffer overflow in SGL loop

[Ji, Kai]

Acked-by: Kai Ji <kai.ji at intel.com>

> -----Original Message-----
> From: Power, Ciara <ciara.power at intel.com>
> Sent: Friday, April 14, 2023 1:32 PM
> To: Ji, Kai <kai.ji at intel.com>
> Cc: dev at dpdk.org; Power, Ciara <ciara.power at intel.com>; stable at dpdk.org
> Subject: [PATCH] crypto/qat: fix stack buffer overflow in SGL loop
> 
> The cvec pointer was incremented incorrectly in the case where the length
> of remaining_off equals cvec len, and there is no next cvec.
> This led to cvec->iova being invalid memory to access.
> 
> Instead, only increment the cvec pointer when we know there is a next cvec
> to point to, by checking the i value, which represents the number of cvecs
> available.
> If i is 0, then no need to increment as the current cvec is the last one.
> 
> Fixes: a815a04cea05 ("crypto/qat: support symmetric build op request")
> Cc: kai.ji at intel.com
> Cc: stable at dpdk.org
> 
> Signed-off-by: Ciara Power <ciara.power at intel.com>
> ---
>  drivers/crypto/qat/dev/qat_crypto_pmd_gens.h | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/crypto/qat/dev/qat_crypto_pmd_gens.h
> b/drivers/crypto/qat/dev/qat_crypto_pmd_gens.h
> index 524c291340..092265631b 100644
> --- a/drivers/crypto/qat/dev/qat_crypto_pmd_gens.h
> +++ b/drivers/crypto/qat/dev/qat_crypto_pmd_gens.h
> @@ -682,7 +682,8 @@ enqueue_one_chain_job_gen1(struct qat_sym_session *ctx,
>  		while (remaining_off >= cvec->len && i >= 1) {
>  			i--;
>  			remaining_off -= cvec->len;
> -			cvec++;
> +			if (i)
> +				cvec++;
>  		}
> 
>  		auth_iova_end = cvec->iova + remaining_off;
> --
> 2.25.1