enic: fix tx_hang_reset use-after-free on device removal

enic_remove() cancels the reset and change_mtu_work items but does not
cancel tx_hang_reset. A TX timeout that fires while the device is being
removed can schedule enic_tx_hang_reset() so that it runs after
free_netdev(), resulting in a use-after-free.

cancel_work_sync() alone is not sufficient here: the still-live watchdog
and notify paths can re-schedule these work items in the window between
the cancel and unregister_netdev(). Use disable_work_sync(), which
cancels the work and blocks any subsequent schedule_work() from
requeuing it, and apply it to the reset and change_mtu_work items as
well so the same requeue race is closed for all teardown work.

Fixes: 937317c7c109 ("enic: do hang reset only in case of tx timeout")
Signed-off-by: Satish Kharat <satishkh@cisco.com>
Link: https://patch.msgid.link/20260728062730.2394873-1-satishkh@cisco.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/cisco/enic/enic_main.c b/drivers/net/ethernet/cisco/enic/enic_main.c
index e7125b81808799c62979d5fbad62e21e39340e38..d98f7e7ccab9b711c5f6c9a5142bf5ca175baaa6 100644 (file)
--- a/drivers/net/ethernet/cisco/enic/enic_main.c
+++ b/drivers/net/ethernet/cisco/enic/enic_main.c
@@ -3011,8 +3011,9 @@ static void enic_remove(struct pci_dev *pdev)
        if (netdev) {
                struct enic *enic = netdev_priv(netdev);
 
-               cancel_work_sync(&enic->reset);
-               cancel_work_sync(&enic->change_mtu_work);
+               disable_work_sync(&enic->reset);
+               disable_work_sync(&enic->tx_hang_reset);
+               disable_work_sync(&enic->change_mtu_work);
                unregister_netdev(netdev);
                enic_dev_deinit(enic);
                vnic_dev_close(enic->vdev);