crypto/qat: fix stack buffer overflow in SGL loop
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Commit Message
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@intel.com
Cc: stable@dpdk.org
Signed-off-by: Ciara Power <ciara.power@intel.com>
---
drivers/crypto/qat/dev/qat_crypto_pmd_gens.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
Comments
Acked-by: Kai Ji <kai.ji@intel.com>
> -----Original Message-----
> From: Power, Ciara <ciara.power@intel.com>
> Sent: Friday, April 14, 2023 1:32 PM
> To: Ji, Kai <kai.ji@intel.com>
> Cc: dev@dpdk.org; Power, Ciara <ciara.power@intel.com>; stable@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@intel.com
> Cc: stable@dpdk.org
>
> Signed-off-by: Ciara Power <ciara.power@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
Hi Ciara,
> -----Original Message-----
> From: Ciara Power <ciara.power@intel.com>
> Sent: Friday 14 April 2023 13:32
> To: Ji, Kai <kai.ji@intel.com>
> Cc: dev@dpdk.org; Power, Ciara <ciara.power@intel.com>; stable@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@intel.com
> Cc: stable@dpdk.org
>
> Signed-off-by: Ciara Power <ciara.power@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
Acked-by: Brian Dooley <brian.dooley@intel.com>
> Acked-by: Kai Ji <kai.ji@intel.com>
Applied to dpdk-next-crypto
Thanks.
@@ -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;