[dpdk-dev] [PATCH v2 4/4] net/ring: check length of ring name

[Stephen Hemminger]

The ring name is passed in as part of this drivers API, but it
doesn't check that the name is not truncated.

Signed-off-by: Stephen Hemminger <step...@networkplumber.org>
---
v2 - fix whitespace creep

 drivers/net/ring/rte_eth_ring.c | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ring/rte_eth_ring.c b/drivers/net/ring/rte_eth_ring.c
index 0355f2b7c4d8..979993fd3e11 100644
--- a/drivers/net/ring/rte_eth_ring.c
+++ b/drivers/net/ring/rte_eth_ring.c
@@ -383,7 +383,12 @@ rte_eth_from_rings(const char *name, struct rte_ring 
*const rx_queues[],
 
        snprintf(args_str, sizeof(args_str), "%s=%p",
                 ETH_RING_INTERNAL_ARG, &args);
-       snprintf(ring_name, sizeof(ring_name), "net_ring_%s", name);
+
+       ret = snprintf(ring_name, sizeof(ring_name), "net_ring_%s", name);
+       if (ret >= (int)sizeof(ring_name)) {
+               rte_errno = ENAMETOOLONG;
+               return -1;
+       }
 
        ret = rte_vdev_init(ring_name, args_str);
        if (ret) {
@@ -417,7 +422,15 @@ eth_dev_ring_create(const char *name, const unsigned int 
numa_node,
                        RTE_PMD_RING_MAX_TX_RINGS);
 
        for (i = 0; i < num_rings; i++) {
-               snprintf(rng_name, sizeof(rng_name), "ETH_RXTX%u_%s", i, name);
+               int cc;
+
+               cc = snprintf(rng_name, sizeof(rng_name),
+                             "ETH_RXTX%u_%s", i, name);
+               if (cc >= (int)sizeof(rng_name)) {
+                       rte_errno = ENAMETOOLONG;
+                       return -1;
+               }
+
                rxtx[i] = (action == DEV_CREATE) ?
                                rte_ring_create(rng_name, 1024, numa_node,
                                                RING_F_SP_ENQ|RING_F_SC_DEQ) :
-- 
2.20.1