[PATCH 3/5] net/pcap: fix segment fault when parse devargs

[Chengwen Feng]

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'.

Fixes: 4c173302c307 ("pcap: add new driver")
Fixes: 53bf48403409 ("net/pcap: capture only ingress packets from Rx iface")
Fixes: c9507cd0cada ("net/pcap: support physical interface MAC address")
Fixes: a3f5252e5cbd ("net/pcap: enable infinitely Rx a pcap file")
Cc: sta...@dpdk.org

Signed-off-by: Chengwen Feng <fengcheng...@huawei.com>
---
 drivers/net/pcap/pcap_ethdev.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/net/pcap/pcap_ethdev.c b/drivers/net/pcap/pcap_ethdev.c
index bfec085045..3fa121c521 100644
--- a/drivers/net/pcap/pcap_ethdev.c
+++ b/drivers/net/pcap/pcap_ethdev.c
@@ -1034,6 +1034,9 @@ open_rx_pcap(const char *key, const char *value, void 
*extra_args)
        struct pmd_devargs *rx = extra_args;
        pcap_t *pcap = NULL;
 
+       if (value == NULL || extra_args == NULL)
+               return -EINVAL;
+
        if (open_single_rx_pcap(pcap_filename, &pcap) < 0)
                return -1;
 
@@ -1056,6 +1059,9 @@ open_tx_pcap(const char *key, const char *value, void 
*extra_args)
        struct pmd_devargs *dumpers = extra_args;
        pcap_dumper_t *dumper;
 
+       if (value == NULL || extra_args == NULL)
+               return -EINVAL;
+
        if (open_single_tx_pcap(pcap_filename, &dumper) < 0)
                return -1;
 
@@ -1077,6 +1083,9 @@ open_rx_tx_iface(const char *key, const char *value, void 
*extra_args)
        struct pmd_devargs *tx = extra_args;
        pcap_t *pcap = NULL;
 
+       if (value == NULL || extra_args == NULL)
+               return -EINVAL;
+
        if (open_single_iface(iface, &pcap) < 0)
                return -1;
 
@@ -1163,7 +1172,7 @@ static int
 select_phy_mac(const char *key __rte_unused, const char *value,
                void *extra_args)
 {
-       if (extra_args) {
+       if (value != NULL && extra_args != NULL) {
                const int phy_mac = atoi(value);
                int *enable_phy_mac = extra_args;
 
@@ -1177,7 +1186,7 @@ static int
 get_infinite_rx_arg(const char *key __rte_unused,
                const char *value, void *extra_args)
 {
-       if (extra_args) {
+       if (value != NULL && extra_args != NULL) {
                const int infinite_rx = atoi(value);
                int *enable_infinite_rx = extra_args;
 
-- 
2.17.1