[dpdk-dev] [PATCH v3] net/i40e: fix VF reset stats crash

[David C Harton <dharton@cisco.com>]

Calling i40evf_dev_xstats_reset can sometimes crash.

Fixed issue by checking return code before using pstats.

Fixes: 8210e9e0d805e ("net/i40e: fix clear xstats bug in VF")
Cc: wei.zhao1@intel.com

Signed-off-by: David C Harton <dharton@cisco.com>
---

v2:
* Fixed fixes line in commit message.

v3:
* Modified conditional to check ret code instead of pointer.


 drivers/net/i40e/i40e_ethdev_vf.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/i40e/i40e_ethdev_vf.c b/drivers/net/i40e/i40e_ethdev_vf.c
index b96d77a..d5a9edb 100644
--- 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,
-- 
2.10.3.dirty