[dpdk-dev] [PATCH 2/2] net/tap: fix use after free on error path

[Yunjian Wang]

The error path was calling rte_eth_dev_release_port() function,
which frees eth_dev->data->dev_private, and then tries to free
pmd->intr_handle, which causes the use after free issue.

The free can be moved to before the release function is called.

Fixes: d61138d4f0e ("drivers: remove direct access to interrupt handle")
Cc: stable at dpdk.org

Signed-off-by: Xiangjun Meng <mengxiangjun4 at huawei.com>
Signed-off-by: Yunjian Wang <wangyunjian at huawei.com>
---
 drivers/net/tap/rte_eth_tap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c
index 5495818be6..9e1032fe72 100644
--- a/drivers/net/tap/rte_eth_tap.c
+++ b/drivers/net/tap/rte_eth_tap.c
@@ -2179,8 +2179,8 @@ eth_dev_tap_create(struct rte_vdev_device *vdev, const char *tap_name,
 		close(pmd->ioctl_sock);
 	/* mac_addrs must not be freed alone because part of dev_private */
 	dev->data->mac_addrs = NULL;
-	rte_eth_dev_release_port(dev);
 	rte_intr_instance_free(pmd->intr_handle);
+	rte_eth_dev_release_port(dev);
 
 error_exit_nodev:
 	TAP_LOG(ERR, "%s Unable to initialize %s",
-- 
2.27.0