lib/netdev-dpdk: make device name parsing more robust

[cascardo/ovs.git] / lib / netdev-dpdk.c

diff --git a/lib/netdev-dpdk.c b/lib/netdev-dpdk.c
index e4f789b..f94e0d4 100644 (file)
--- a/lib/netdev-dpdk.c
+++ b/lib/netdev-dpdk.c
@@ -188,7 +188,7 @@ struct dpdk_ring {
     /* For the client rings */
     struct rte_ring *cring_tx;
     struct rte_ring *cring_rx;
-    int user_port_id; /* User given port no, parsed from port name */
+    unsigned int user_port_id; /* User given port no, parsed from port name */
     int eth_port_id; /* ethernet device port id */
     struct ovs_list list_node OVS_GUARDED_BY(dpdk_mutex);
 };
@@ -635,6 +635,8 @@ unlock:
     return err;
 }
 
+/* dev_name must be the prefix followed by a positive decimal number.
+ * (no leading + or - signs are allowed) */
 static int
 dpdk_dev_parse_name(const char dev_name[], const char prefix[],
                     unsigned int *port_no)
@@ -646,8 +648,12 @@ dpdk_dev_parse_name(const char dev_name[], const char prefix[],
     }
 
     cport = dev_name + strlen(prefix);
-    *port_no = strtol(cport, NULL, 0); /* string must be null terminated */
-    return 0;
+
+    if (str_to_uint(cport, 10, port_no)) {
+        return 0;
+    } else {
+        return ENODEV;
+    }
 }
 
 static int
@@ -2020,7 +2026,7 @@ dpdk_ring_create(const char dev_name[], unsigned int port_no,
                  unsigned int *eth_port_id)
 {
     struct dpdk_ring *ivshmem;
-    char ring_name[10];
+    char ring_name[RTE_RING_NAMESIZE];
     int err;
 
     ivshmem = dpdk_rte_mzalloc(sizeof *ivshmem);
@@ -2029,7 +2035,7 @@ dpdk_ring_create(const char dev_name[], unsigned int port_no,
     }
 
     /* XXX: Add support for multiquque ring. */
-    err = snprintf(ring_name, 10, "%s_tx", dev_name);
+    err = snprintf(ring_name, sizeof(ring_name), "%s_tx", dev_name);
     if (err < 0) {
         return -err;
     }
@@ -2042,7 +2048,7 @@ dpdk_ring_create(const char dev_name[], unsigned int port_no,
         return ENOMEM;
     }
 
-    err = snprintf(ring_name, 10, "%s_rx", dev_name);
+    err = snprintf(ring_name, sizeof(ring_name), "%s_rx", dev_name);
     if (err < 0) {
         return -err;
     }