[PATCH v3 0/3] DPDK Coverity issue 381631, 381646

[PATCH v3 0/3] DPDK Coverity issue 381631, 381646

[Hernan Vargas]

v3: Split commits further for clarity.
v2: Split code unrelated to coverity fix in separate commit.
v1: Upstream fix to 23.03 for potential issue of dereferencing a pointer before null check.

Hernan Vargas (3):
  baseband/acc: fix check after deref and dead code
  baseband/acc: remove unused ops check
  baseband/acc: add check for empty queue

 drivers/baseband/acc/rte_acc100_pmd.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

-- 
2.37.1

[PATCH v3 1/3] baseband/acc: fix check after deref and dead code

[Hernan Vargas]

Fix potential issue of dereferencing a pointer before null check.
Remove null check for value that could never be null.

Coverity issue: 381646, 381631
Fixes: 989dec301a9 ("baseband/acc100: add ring companion address")
Cc: stable@dpdk.org

Signed-off-by: Hernan Vargas <hernan.vargas@intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---
 drivers/baseband/acc/rte_acc100_pmd.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/baseband/acc/rte_acc100_pmd.c b/drivers/baseband/acc/rte_acc100_pmd.c
index 36f6fec5ad..baab459436 100644
--- a/drivers/baseband/acc/rte_acc100_pmd.c
+++ b/drivers/baseband/acc/rte_acc100_pmd.c
@@ -4106,8 +4106,6 @@ acc100_dequeue_ldpc_enc(struct rte_bbdev_queue_data *q_data,
 	int ret, cbm;
 	struct rte_bbdev_enc_op *op;
 
-	if (q == NULL)
-		return 0;
 #ifdef RTE_LIBRTE_BBDEV_DEBUG
 	if (unlikely(ops == 0))
 		return 0;
-- 
2.37.1

[PATCH v3 2/3] baseband/acc: remove unused ops check

[Hernan Vargas]

Remove unnecessary debug check for ops.

Signed-off-by: Hernan Vargas <hernan.vargas@intel.com>
---
 drivers/baseband/acc/rte_acc100_pmd.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/baseband/acc/rte_acc100_pmd.c b/drivers/baseband/acc/rte_acc100_pmd.c
index baab459436..c242f7737a 100644
--- a/drivers/baseband/acc/rte_acc100_pmd.c
+++ b/drivers/baseband/acc/rte_acc100_pmd.c
@@ -4106,10 +4106,6 @@ acc100_dequeue_ldpc_enc(struct rte_bbdev_queue_data *q_data,
 	int ret, cbm;
 	struct rte_bbdev_enc_op *op;
 
-#ifdef RTE_LIBRTE_BBDEV_DEBUG
-	if (unlikely(ops == 0))
-		return 0;
-#endif
 	op = acc_op_tail(q, 0);
 	if (unlikely(ops == NULL || op == NULL))
 		return 0;
-- 
2.37.1

[PATCH v3 3/3] baseband/acc: add check for empty queue

[Hernan Vargas]

Add optimization to return early if there are no available descriptors
in ring to dequeue.

Signed-off-by: Hernan Vargas <hernan.vargas@intel.com>
---
 drivers/baseband/acc/rte_acc100_pmd.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/baseband/acc/rte_acc100_pmd.c b/drivers/baseband/acc/rte_acc100_pmd.c
index c242f7737a..9941754aa0 100644
--- a/drivers/baseband/acc/rte_acc100_pmd.c
+++ b/drivers/baseband/acc/rte_acc100_pmd.c
@@ -4106,6 +4106,9 @@ acc100_dequeue_ldpc_enc(struct rte_bbdev_queue_data *q_data,
 	int ret, cbm;
 	struct rte_bbdev_enc_op *op;
 
+	if (avail == 0)
+		return 0;
+
 	op = acc_op_tail(q, 0);
 	if (unlikely(ops == NULL || op == NULL))
 		return 0;
-- 
2.37.1

Re: [PATCH v3 2/3] baseband/acc: remove unused ops check

[Maxime Coquelin]

On 2/22/23 17:40, Hernan Vargas wrote:
> Remove unnecessary debug check for ops.
> 
> Signed-off-by: Hernan Vargas <hernan.vargas@intel.com>
> ---
>   drivers/baseband/acc/rte_acc100_pmd.c | 4 ----
>   1 file changed, 4 deletions(-)
> 
> diff --git a/drivers/baseband/acc/rte_acc100_pmd.c b/drivers/baseband/acc/rte_acc100_pmd.c
> index baab459436..c242f7737a 100644
> --- a/drivers/baseband/acc/rte_acc100_pmd.c
> +++ b/drivers/baseband/acc/rte_acc100_pmd.c
> @@ -4106,10 +4106,6 @@ acc100_dequeue_ldpc_enc(struct rte_bbdev_queue_data *q_data,
>   	int ret, cbm;
>   	struct rte_bbdev_enc_op *op;
>   
> -#ifdef RTE_LIBRTE_BBDEV_DEBUG
> -	if (unlikely(ops == 0))
> -		return 0;
> -#endif
>   	op = acc_op_tail(q, 0);
>   	if (unlikely(ops == NULL || op == NULL))
>   		return 0;

Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>

Thanks,
Maxime

Re: [PATCH v3 3/3] baseband/acc: add check for empty queue

[Maxime Coquelin]

On 2/22/23 17:40, Hernan Vargas wrote:
> Add optimization to return early if there are no available descriptors
> in ring to dequeue.
> 
> Signed-off-by: Hernan Vargas <hernan.vargas@intel.com>
> ---
>   drivers/baseband/acc/rte_acc100_pmd.c | 3 +++
>   1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/baseband/acc/rte_acc100_pmd.c b/drivers/baseband/acc/rte_acc100_pmd.c
> index c242f7737a..9941754aa0 100644
> --- a/drivers/baseband/acc/rte_acc100_pmd.c
> +++ b/drivers/baseband/acc/rte_acc100_pmd.c
> @@ -4106,6 +4106,9 @@ acc100_dequeue_ldpc_enc(struct rte_bbdev_queue_data *q_data,
>   	int ret, cbm;
>   	struct rte_bbdev_enc_op *op;
>   
> +	if (avail == 0)
> +		return 0;
> +
>   	op = acc_op_tail(q, 0);
>   	if (unlikely(ops == NULL || op == NULL))
>   		return 0;

Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>

Thanks,
Maxime

Re: [PATCH v3 0/3] DPDK Coverity issue 381631, 381646

[Maxime Coquelin]

On 2/22/23 17:40, Hernan Vargas wrote:
> v3: Split commits further for clarity.
> v2: Split code unrelated to coverity fix in separate commit.
> v1: Upstream fix to 23.03 for potential issue of dereferencing a pointer before null check.
> 
> Hernan Vargas (3):
>    baseband/acc: fix check after deref and dead code
>    baseband/acc: remove unused ops check
>    baseband/acc: add check for empty queue
> 
>   drivers/baseband/acc/rte_acc100_pmd.c | 7 ++-----
>   1 file changed, 2 insertions(+), 5 deletions(-)
> 

Applied to dpdk-next-baseband/for-main.

Thanks,
Maxime