net/i40e: fix VF reset stats crash

Calling i40evf_dev_xstats_reset can sometimes crash. Fixed issue
by checking return code before using pstats.

Fixes: 8210e9e0d805 ("net/i40e: fix clear xstats bug in VF")
Cc: stable@dpdk.org
Signed-off-by: David Harton <dharton@cisco.com>
Acked-by: Harry van Haaren <harry.van.haaren@intel.com>
Acked-by: Wei Zhao <wei.zhao1@intel.com>

diff --git a/drivers/net/i40e/i40e_ethdev_vf.c b/drivers/net/i40e/i40e_ethdev_vf.c
index 4d50862..0cca0d3 100644 (file)
--- a/drivers/net/i40e/i40e_ethdev_vf.c
+++ b/drivers/net/i40e/i40e_ethdev_vf.c
@@ -916,14 +916,16 @@ i40evf_update_stats(struct i40e_vsi *vsi,
 static void
 i40evf_dev_xstats_reset(struct rte_eth_dev *dev)
 {
+       int ret;
        struct i40e_vf *vf = I40EVF_DEV_PRIVATE_TO_VF(dev->data->dev_private);
        struct i40e_eth_stats *pstats = NULL;
 
        /* read stat values to clear hardware registers */
-       i40evf_query_stats(dev, &pstats);
+       ret = i40evf_query_stats(dev, &pstats);
 
        /* set stats offset base on current values */
-       vf->vsi.eth_stats_offset = *pstats;
+       if (ret == 0)
+               vf->vsi.eth_stats_offset = *pstats;
 }
 
 static int i40evf_dev_xstats_get_names(__rte_unused struct rte_eth_dev *dev,