[dpdk-dev] [PATCH v4 5/5] net/tap: fix leak of fds on failure

[wangyunjian]

From: Yunjian Wang <wangyunjian at huawei.com>

When eth_dev_tap_create() is failed, nlsk_fd and ka_fd won't be closed
thus leading fds leak. Zero is a valid fd. Ultimately leads to a valid
fd was closed by mistake.

Fixes: bf7b7f437b49 ("net/tap: create netdevice during probing")
Fixes: cb7e68da630a ("net/tap: fix cleanup on allocation failure")
CC: stable at dpdk.org

Signed-off-by: Yunjian Wang <wangyunjian at huawei.com>
---
 drivers/net/tap/rte_eth_tap.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c
index 829a9e9b4..9bea5d9d0 100644
--- a/drivers/net/tap/rte_eth_tap.c
+++ b/drivers/net/tap/rte_eth_tap.c
@@ -1820,6 +1820,8 @@ eth_dev_tap_create(struct rte_vdev_device *vdev, const char *tap_name,
 	pmd->dev = dev;
 	strlcpy(pmd->name, tap_name, sizeof(pmd->name));
 	pmd->type = type;
+	pmd->ka_fd = -1;
+	pmd->nlsk_fd = -1;
 
 	pmd->ioctl_sock = socket(AF_INET, SOCK_DGRAM, 0);
 	if (pmd->ioctl_sock == -1) {
@@ -1850,7 +1852,6 @@ eth_dev_tap_create(struct rte_vdev_device *vdev, const char *tap_name,
 	dev->intr_handle = &pmd->intr_handle;
 
 	/* Presetup the fds to -1 as being not valid */
-	pmd->ka_fd = -1;
 	for (i = 0; i < RTE_PMD_TAP_MAX_QUEUES; i++) {
 		process_private->rxq_fds[i] = -1;
 		process_private->txq_fds[i] = -1;
@@ -1990,7 +1991,11 @@ eth_dev_tap_create(struct rte_vdev_device *vdev, const char *tap_name,
 	tap_flow_implicit_flush(pmd, NULL);
 
 error_exit:
-	if (pmd->ioctl_sock > 0)
+	if (pmd->nlsk_fd == -1)
+		close(pmd->nlsk_fd);
+	if (pmd->ka_fd != -1)
+		close(pmd->ka_fd);
+	if (pmd->ioctl_sock != -1)
 		close(pmd->ioctl_sock);
 	/* mac_addrs must not be freed alone because part of dev_private */
 	dev->data->mac_addrs = NULL;
-- 
2.19.1