net/txgbe: reset security context pointer on close

[ upstream commit 6d498b8 ]

When txgbe_dev_close() is cleaning up, it does not correctly set
the security_ctx variable to NULL, which will lead to wild pointer.

Fixes: f437d97 ("net/txgbe: add IPsec context creation")

Signed-off-by: Yunjian Wang <wangyunjian@huawei.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>

drivers/net/txgbe/txgbe_ethdev.c

@@ -2036,6 +2036,7 @@ txgbe_dev_close(struct rte_eth_dev *dev)
 
 #ifdef RTE_LIB_SECURITY
 	rte_free(dev->security_ctx);
+	dev->security_ctx = NULL;
 #endif
 
 	return ret;