[PATCH 6/9] net/hns3: fix segment fault when parse runtime config

[Chengwen Feng <fengchengwen@huawei.com>]

The rte_kvargs_process() was used to parse KV pairs, it also supports
to parse 'only keys' (e.g. socket_id) type. And the callback function
parameter 'value' is NULL when parsed 'only keys'.

This patch fixes segment fault when parse input args with 'only keys'
(e.g. rx_func_hint).

Fixes: a124f9e9591b ("net/hns3: add runtime config to select IO burst function")
Fixes: 70791213242e ("net/hns3: support masking device capability")
Fixes: 2fc3e696a7f1 ("net/hns3: add runtime config for mailbox limit time")
Cc: stable@dpdk.org

Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
---
 drivers/net/hns3/hns3_common.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/net/hns3/hns3_common.c b/drivers/net/hns3/hns3_common.c
index a0c9e66c2c..f077ef5057 100644
--- a/drivers/net/hns3/hns3_common.c
+++ b/drivers/net/hns3/hns3_common.c
@@ -163,6 +163,9 @@ hns3_parse_io_hint_func(const char *key, const char *value, void *extra_args)
 
 	RTE_SET_USED(key);
 
+	if (value == NULL || extra_args == NULL)
+		return 0;
+
 	if (strcmp(value, "vec") == 0)
 		hint = HNS3_IO_FUNC_HINT_VEC;
 	else if (strcmp(value, "sve") == 0)
@@ -203,6 +206,9 @@ hns3_parse_dev_caps_mask(const char *key, const char *value, void *extra_args)
 
 	RTE_SET_USED(key);
 
+	if (value == NULL || extra_args == NULL)
+		return 0;
+
 	val = strtoull(value, NULL, HNS3_CONVERT_TO_HEXADECIMAL);
 	*(uint64_t *)extra_args = val;
 
@@ -216,6 +222,9 @@ hns3_parse_mbx_time_limit(const char *key, const char *value, void *extra_args)
 
 	RTE_SET_USED(key);
 
+	if (value == NULL || extra_args == NULL)
+		return 0;
+
 	val = strtoul(value, NULL, HNS3_CONVERT_TO_DECIMAL);
 
 	/*
-- 
2.17.1