net/pcap: fix resource leakage on port probe

When the port is probed, if the eth_from_pcaps function fails, the
previously opened pcap resources are not released, causing resource
leakage.

The patch solves the problem of resource leakage caused by abnormal
branch exit during the port probe process.

Fixes: 4c173302c307 ("pcap: add new driver")
Cc: stable@dpdk.org
Signed-off-by: Qiming Chen <chenqiming_huawei@163.com>
Acked-by: Ferruh Yigit <ferruh.yigit@intel.com>

diff --git a/drivers/net/pcap/pcap_ethdev.c b/drivers/net/pcap/pcap_ethdev.c
index a8774b7..5c4cdbf 100644 (file)
--- a/drivers/net/pcap/pcap_ethdev.c
+++ b/drivers/net/pcap/pcap_ethdev.c
@@ -1362,6 +1362,33 @@ eth_from_pcaps(struct rte_vdev_device *vdev,
        return 0;
 }
 
+static void
+eth_release_pcaps(struct pmd_devargs *pcaps,
+               struct pmd_devargs *dumpers,
+               int single_iface)
+{
+       unsigned int i;
+
+       if (single_iface) {
+               if (pcaps->queue[0].pcap)
+                       pcap_close(pcaps->queue[0].pcap);
+               return;
+       }
+
+       for (i = 0; i < dumpers->num_of_queue; i++) {
+               if (dumpers->queue[i].dumper)
+                       pcap_dump_close(dumpers->queue[i].dumper);
+
+               if (dumpers->queue[i].pcap)
+                       pcap_close(dumpers->queue[i].pcap);
+       }
+
+       for (i = 0; i < pcaps->num_of_queue; i++) {
+               if (pcaps->queue[i].pcap)
+                       pcap_close(pcaps->queue[i].pcap);
+       }
+}
+
 static int
 pmd_pcap_probe(struct rte_vdev_device *dev)
 {
@@ -1582,6 +1609,9 @@ create_eth:
 free_kvlist:
        rte_kvargs_free(kvlist);
 
+       if (ret < 0)
+               eth_release_pcaps(&pcaps, &dumpers, devargs_all.single_iface);
+
        return ret;
 }