[PATCH 07/10] net/tap: fix resource leaks in secondary process probe

[Stephen Hemminger <stephen@networkplumber.org>]

Four error paths in the secondary-process branch of
rte_pmd_tap_probe() returned -1 without cleanup:

- primary process not alive: leaked eth_dev
- process_private malloc failure: leaked eth_dev
- tap_mp_attach_queues failure: leaked eth_dev and process_private
- rte_mp_action_register failure: leaked eth_dev and process_private

Add secondary_fail and secondary_fail_pp labels to free
process_private and release the ethdev port.

Bugzilla ID: 1881
Fixes: c9aa56edec8e ("net/tap: access primary process queues from secondary")
Cc: stable@dpdk.org

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/tap/rte_eth_tap.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c
index 0bc0e11e0b..251b05b27b 100644
--- a/drivers/net/tap/rte_eth_tap.c
+++ b/drivers/net/tap/rte_eth_tap.c
@@ -2502,31 +2502,38 @@ rte_pmd_tap_probe(struct rte_vdev_device *dev)
 		eth_dev->tx_pkt_burst = pmd_tx_burst;
 		if (!rte_eal_primary_proc_alive(NULL)) {
 			TAP_LOG(ERR, "Primary process is missing");
-			return -1;
+			goto secondary_fail;
 		}
 		eth_dev->process_private = malloc(sizeof(struct pmd_process_private));
 		if (eth_dev->process_private == NULL) {
 			TAP_LOG(ERR,
 				"Failed to alloc memory for process private");
-			return -1;
+			goto secondary_fail;
 		}
 		memset(eth_dev->process_private, 0, sizeof(struct pmd_process_private));
 
 		ret = tap_mp_attach_queues(name, eth_dev);
 		if (ret != 0)
-			return -1;
+			goto secondary_fail_pp;
 
 		if (!tap_devices_count) {
 			ret = rte_mp_action_register(TAP_MP_REQ_START_RXTX, tap_mp_req_start_rxtx);
 			if (ret < 0 && rte_errno != ENOTSUP) {
 				TAP_LOG(ERR, "tap: Failed to register IPC callback: %s",
 					strerror(rte_errno));
-				return -1;
+				goto secondary_fail_pp;
 			}
 		}
 		tap_devices_count++;
 		rte_eth_dev_probing_finish(eth_dev);
 		return 0;
+
+secondary_fail_pp:
+		free(eth_dev->process_private);
+		eth_dev->process_private = NULL;
+secondary_fail:
+		rte_eth_dev_release_port(eth_dev);
+		return -1;
 	}
 
 	/* use tap%d which causes kernel to choose next available */
-- 
2.51.0