[dpdk-dev] [PATCH] examples/ioat: fix unchecked return value

[dpdk-dev] [PATCH] examples/ioat: fix unchecked return value

[Ciara Power]

The return value of the get link function call was not checked, and
could return a negative value indicating a failure. If the return value
is not 0 for success, the loop continues with the next port.

To avoid a slight name clash with the new ret variable, the existing
retval variable is renamed to link_status, to better represent its use.

Coverity issue: 350348
Fixes: c8e6ceecebc1 ("examples/ioat: add new sample app for ioat driver")
Cc: pawelx.modrak@intel.com
Cc: stable@dpdk.org

Signed-off-by: Ciara Power <ciara.power@intel.com>
---
 examples/ioat/ioatfwd.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/examples/ioat/ioatfwd.c b/examples/ioat/ioatfwd.c
index e9117718f..99ecc0fde 100644
--- a/examples/ioat/ioatfwd.c
+++ b/examples/ioat/ioatfwd.c
@@ -697,7 +697,7 @@ check_link_status(uint32_t port_mask)
 {
 	uint16_t portid;
 	struct rte_eth_link link;
-	int retval = 0;
+	int ret, link_status = 0;
 
 	printf("\nChecking link status\n");
 	RTE_ETH_FOREACH_DEV(portid) {
@@ -705,7 +705,12 @@ check_link_status(uint32_t port_mask)
 			continue;
 
 		memset(&link, 0, sizeof(link));
-		rte_eth_link_get(portid, &link);
+		ret = rte_eth_link_get(portid, &link);
+		if (ret < 0) {
+			printf("Port %u link get failed: err=%d\n",
+					portid, ret);
+			continue;
+		}
 
 		/* Print link status */
 		if (link.link_status) {
@@ -714,11 +719,11 @@ check_link_status(uint32_t port_mask)
 				portid, link.link_speed,
 				(link.link_duplex == ETH_LINK_FULL_DUPLEX) ?
 				("full-duplex") : ("half-duplex\n"));
-			retval = 1;
+			link_status = 1;
 		} else
 			printf("Port %d Link Down\n", portid);
 	}
-	return retval;
+	return link_status;
 }
 
 static void
-- 
2.17.1

[dpdk-dev] [PATCH v2] examples/ioat: fix invalid link status check

[Ciara Power]

The return value of the get link function call was not checked, and
could return a negative value indicating a failure. This meant the
link_status of the link being checked is invalid, because the link was
not filled with data. The return value is now checked, and if the return
value is not 0 for success, the loop continues with the next port.

To avoid confusion between variable names, the existing retval variable
is renamed to link_status, to better represent its use.

Coverity issue: 350348
Fixes: c8e6ceecebc1 ("examples/ioat: add new sample app for ioat driver")
Cc: pawelx.modrak@intel.com
Cc: stable@dpdk.org

Signed-off-by: Ciara Power <ciara.power@intel.com>

---
v2:
  - Changed commit log subject and description
  - Rebased onto master
---
 examples/ioat/ioatfwd.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/examples/ioat/ioatfwd.c b/examples/ioat/ioatfwd.c
index e9117718f..99ecc0fde 100644
--- a/examples/ioat/ioatfwd.c
+++ b/examples/ioat/ioatfwd.c
@@ -697,7 +697,7 @@ check_link_status(uint32_t port_mask)
 {
 	uint16_t portid;
 	struct rte_eth_link link;
-	int retval = 0;
+	int ret, link_status = 0;
 
 	printf("\nChecking link status\n");
 	RTE_ETH_FOREACH_DEV(portid) {
@@ -705,7 +705,12 @@ check_link_status(uint32_t port_mask)
 			continue;
 
 		memset(&link, 0, sizeof(link));
-		rte_eth_link_get(portid, &link);
+		ret = rte_eth_link_get(portid, &link);
+		if (ret < 0) {
+			printf("Port %u link get failed: err=%d\n",
+					portid, ret);
+			continue;
+		}
 
 		/* Print link status */
 		if (link.link_status) {
@@ -714,11 +719,11 @@ check_link_status(uint32_t port_mask)
 				portid, link.link_speed,
 				(link.link_duplex == ETH_LINK_FULL_DUPLEX) ?
 				("full-duplex") : ("half-duplex\n"));
-			retval = 1;
+			link_status = 1;
 		} else
 			printf("Port %d Link Down\n", portid);
 	}
-	return retval;
+	return link_status;
 }
 
 static void
-- 
2.17.1

Re: [dpdk-dev] [PATCH v2] examples/ioat: fix invalid link status check

[Bruce Richardson]

On Fri, Feb 07, 2020 at 10:24:02AM +0000, Ciara Power wrote:
> The return value of the get link function call was not checked, and
> could return a negative value indicating a failure. This meant the
> link_status of the link being checked is invalid, because the link was
> not filled with data. The return value is now checked, and if the return
> value is not 0 for success, the loop continues with the next port.
> 
> To avoid confusion between variable names, the existing retval variable
> is renamed to link_status, to better represent its use.
> 
> Coverity issue: 350348
> Fixes: c8e6ceecebc1 ("examples/ioat: add new sample app for ioat driver")
> Cc: pawelx.modrak@intel.com
> Cc: stable@dpdk.org
> 
> Signed-off-by: Ciara Power <ciara.power@intel.com>
> 
Acked-by: Bruce Richardson <bruce.richardson@intel.com>

Re: [dpdk-dev] [PATCH v2] examples/ioat: fix invalid link status check

[David Marchand]

On Fri, Feb 7, 2020 at 11:34 AM Ciara Power <ciara.power@intel.com> wrote:
>
> The return value of the get link function call was not checked, and
> could return a negative value indicating a failure. This meant the
> link_status of the link being checked is invalid, because the link was
> not filled with data. The return value is now checked, and if the return
> value is not 0 for success, the loop continues with the next port.
>
> To avoid confusion between variable names, the existing retval variable
> is renamed to link_status, to better represent its use.
>
> Coverity issue: 350348
> Fixes: c8e6ceecebc1 ("examples/ioat: add new sample app for ioat driver")
> Cc: stable@dpdk.org
>
> Signed-off-by: Ciara Power <ciara.power@intel.com>

Acked-by: Bruce Richardson <bruce.richardson@intel.com>

Applied, thanks.


--
David Marchand