net/failsafe: fix probe cleanup

The hot-plug alarm mechanism is responsible to practically execute both
plug in and out operations. It periodically tries to detect missed
sub-devices to be reconfigured and clean the resources of the removed
sub-devices.

The hot-plug alarm is started by the failsafe probe function, and it's
wrongly not stopped if failsafe instance got an error. for example
when starting failsafe with a MAC option, and giving it an invalid MAC
address this will lead to a NULL pointer for the dev private field. Then
when the hotplug alarm is called it will try to access this pointer,
which will lead to a segmentation fault.

Uninstall the hot-plug alarm in case of error in probe function.

Fixes: ebea83f8 ("net/failsafe: add plug-in support")
Cc: stable@dpdk.org
Signed-off-by: Raslan Darawsheh <rasland@mellanox.com>
Acked-by: Matan Azrad <matan@mellanox.com>
Acked-by: Gaetan Rivet <gaetan.rivet@6wind.com>

diff --git a/drivers/net/failsafe/failsafe.c b/drivers/net/failsafe/failsafe.c
index 5e7a8ba..3a747c2 100644 (file)
--- a/drivers/net/failsafe/failsafe.c
+++ b/drivers/net/failsafe/failsafe.c
@@ -226,7 +226,7 @@ fs_eth_dev_create(struct rte_vdev_device *vdev)
                                                               mac);
                        if (ret) {
                                ERROR("Failed to set default MAC address");
-                               goto free_args;
+                               goto cancel_alarm;
                        }
                }
        } else {
@@ -260,6 +260,8 @@ fs_eth_dev_create(struct rte_vdev_device *vdev)
                .type = RTE_INTR_HANDLE_EXT,
        };
        return 0;
+cancel_alarm:
+       failsafe_hotplug_alarm_cancel(dev);
 free_args:
        failsafe_args_free(dev);
 free_subs: