[PATCH v3 06/10] net/tap: fix resource leaks in tap create error path

[Stephen Hemminger <stephen@networkplumber.org>]

Correct two leaks in eth_dev_tap_create():

- process_private was never freed on error_exit. Add free() before
  releasing the port.
- If the process_private malloc failed, the function returned -1
  directly without releasing the ethdev port allocated by
  rte_eth_vdev_allocate(). Jump to a new error_exit_nodev_release
  label instead.

Bugzilla ID: 1881
Fixes: ed8132e7c912 ("net/tap: move fds of queues to be in process private")
Cc: stable@dpdk.org

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/tap/rte_eth_tap.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c
index 45ca32cfb8..9b38d1f50b 100644
--- a/drivers/net/tap/rte_eth_tap.c
+++ b/drivers/net/tap/rte_eth_tap.c
@@ -2010,7 +2010,7 @@ eth_dev_tap_create(struct rte_vdev_device *vdev, const char *tap_name,
 	process_private = malloc(sizeof(struct pmd_process_private));
 	if (process_private == NULL) {
 		TAP_LOG(ERR, "Failed to alloc memory for process private");
-		return -1;
+		goto error_exit_nodev_release;
 	}
 	memset(process_private, 0, sizeof(struct pmd_process_private));
 
@@ -2200,9 +2200,12 @@ eth_dev_tap_create(struct rte_vdev_device *vdev, const char *tap_name,
 		close(pmd->nlsk_fd);
 	if (pmd->ka_fd != -1)
 		close(pmd->ka_fd);
+	rte_intr_instance_free(pmd->intr_handle);
+	free(dev->process_private);
+
+error_exit_nodev_release:
 	/* mac_addrs must not be freed alone because part of dev_private */
 	dev->data->mac_addrs = NULL;
-	rte_intr_instance_free(pmd->intr_handle);
 	rte_eth_dev_release_port(dev);
 
 error_exit_nodev:
-- 
2.51.0