ethdev: check more errors in xstats retrieval

Some function calls in xstat functions can return negative values
to indicate the error, check return values for those cases.

Coverity issue: 195028, 195026
Fixes: 8c49d5f1c219 ("ethdev: rework xstats retrieve by id")
Cc: stable@dpdk.org
Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
Acked-by: Thomas Monjalon <thomas@monjalon.net>

diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index 8bcd3a2..17ebb94 100644 (file)
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -1661,11 +1661,16 @@ rte_eth_xstats_get_names_by_id(uint16_t port_id,
        unsigned int expected_entries;
        struct rte_eth_dev *dev;
        unsigned int i;
+       int ret;
 
        RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
-       expected_entries = get_xstats_count(port_id);
        dev = &rte_eth_devices[port_id];
 
+       ret = get_xstats_count(port_id);
+       if (ret < 0)
+               return ret;
+       expected_entries = (unsigned int)ret;
+
        /* Return max number of stats if no ids given */
        if (!ids) {
                if (!xstats_names)
@@ -1809,6 +1814,7 @@ rte_eth_xstats_get_by_id(uint16_t port_id, const uint64_t *ids,
        uint16_t expected_entries;
        struct rte_eth_dev *dev;
        unsigned int i;
+       int ret;
 
        RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
        expected_entries = get_xstats_count(port_id);
@@ -1849,8 +1855,10 @@ rte_eth_xstats_get_by_id(uint16_t port_id, const uint64_t *ids,
        }
 
        /* Fill the xstats structure */
-       num_xstats_filled = rte_eth_xstats_get(port_id, xstats,
-               expected_entries);
+       ret = rte_eth_xstats_get(port_id, xstats, expected_entries);
+       if (ret < 0)
+               return ret;
+       num_xstats_filled = (unsigned int)ret;
 
        /* Return all stats */
        if (!ids) {