[PATCH] ethdev: check for invalid device name

[Stephen Hemminger <stephen@networkplumber.org>]

Do not allow creating a ethernet device with a name over the
allowed maximum (or zero length). This is safer than silently truncating
which is what happens now.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Acked-by: Andrew Rybchenko <arybchenko@solarflare.com>
---
v1 - previously sent as RFC

 lib/librte_ethdev/rte_ethdev.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c
index 85c1794968dd..0b81980ff71c 100644
--- a/lib/librte_ethdev/rte_ethdev.c
+++ b/lib/librte_ethdev/rte_ethdev.c
@@ -439,6 +439,16 @@ rte_eth_dev_allocate(const char *name)
 	uint16_t port_id;
 	struct rte_eth_dev *eth_dev = NULL;
 
+	if (*name) {
+		RTE_ETHDEV_LOG(ERR, "Zero length Ethernet device name\n");
+		return NULL;
+	}
+
+	if (strnlen(name, RTE_ETH_NAME_MAX_LEN) >= RTE_ETH_NAME_MAX_LEN) {
+		RTE_ETHDEV_LOG(ERR, "Ethernet device name is too long\n");
+		return NULL;
+	}
+
 	rte_eth_dev_shared_data_prepare();
 
 	/* Synchronize port creation between primary and secondary threads. */
-- 
2.17.1