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

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

[Ciara Power]

The function call to get the device info can return negative values on
failure, which was previously unchecked. This return value is now
checked and the function exits on failure.

Coverity issue: 350361
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 | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/examples/ioat/ioatfwd.c b/examples/ioat/ioatfwd.c
index e9117718f..029f2f0ab 100644
--- a/examples/ioat/ioatfwd.c
+++ b/examples/ioat/ioatfwd.c
@@ -824,7 +824,10 @@ port_init(uint16_t portid, struct rte_mempool *mbuf_pool, uint16_t nb_queues)
 	/* Init port */
 	printf("Initializing port %u... ", portid);
 	fflush(stdout);
-	rte_eth_dev_info_get(portid, &dev_info);
+	ret = rte_eth_dev_info_get(portid, &dev_info);
+	if (ret < 0)
+		rte_exit(EXIT_FAILURE, "Error during getting device info:"
+			" err=%d, port=%u\n", ret, portid);
 	local_port_conf.rx_adv_conf.rss_conf.rss_hf &=
 		dev_info.flow_type_rss_offloads;
 	if (dev_info.tx_offload_capa & DEV_TX_OFFLOAD_MBUF_FAST_FREE)
-- 
2.17.1

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

[David Marchand]

On Tue, Feb 4, 2020 at 5:13 PM Ciara Power <ciara.power@intel.com> wrote:
>
> The function call to get the device info can return negative values on
> failure, which was previously unchecked. This return value is now
> checked and the function exits on failure.
>
> Coverity issue: 350361
> Fixes: c8e6ceecebc1 ("examples/ioat: add new sample app for ioat driver")
> Cc: pawelx.modrak@intel.com
> Cc: stable@dpdk.org

We had the same patch proposed in 19.11 timeframe that got deferred to 20.02.
https://patchwork.dpdk.org/patch/63375/
Will mark https://patchwork.dpdk.org/patch/65563/ as rejected.


Besides, we have a patch with the exact same subject than this one.
https://patchwork.dpdk.org/patch/65562/

A title must (briefly) describe what functional impact the patch has.

-- 
David Marchand

[dpdk-stable] [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