diff options
| author | Jason Gunthorpe <jgg@nvidia.com> | 2022-11-24 03:27:14 +0300 |
|---|---|---|
| committer | Leon Romanovsky <leon@kernel.org> | 2022-11-28 12:58:19 +0300 |
| commit | 09f530f0c6d6689eee5e690c6d98f495fcc3a0f9 (patch) | |
| tree | c95af8b0b13a83c606488015707afba4e4453ea5 /drivers/infiniband/core | |
| parent | 0edf42cbcc8690ef349d4432fea74d7791e3c645 (diff) | |
| download | linux-09f530f0c6d6689eee5e690c6d98f495fcc3a0f9.tar.xz | |
RDMA: Add netdevice_tracker to ib_device_set_netdev()
This will cause an informative backtrace to print if the user of
ib_device_set_netdev() isn't careful about tearing down the ibdevice
before its the netdevice parent is destroyed. Such as like this:
unregister_netdevice: waiting for vlan0 to become free. Usage count = 2
leaked reference.
ib_device_set_netdev+0x266/0x730
siw_newlink+0x4e0/0xfd0
nldev_newlink+0x35c/0x5c0
rdma_nl_rcv_msg+0x36d/0x690
rdma_nl_rcv+0x2ee/0x430
netlink_unicast+0x543/0x7f0
netlink_sendmsg+0x918/0xe20
sock_sendmsg+0xcf/0x120
____sys_sendmsg+0x70d/0x8b0
___sys_sendmsg+0x11d/0x1b0
__sys_sendmsg+0xfa/0x1d0
do_syscall_64+0x35/0xb0
entry_SYSCALL_64_after_hwframe+0x63/0xcd
This will help debug the issues syzkaller is seeing.
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/0-v1-a7c81b3842ce+e5-netdev_tracker_jgg@nvidia.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Diffstat (limited to 'drivers/infiniband/core')
| -rw-r--r-- | drivers/infiniband/core/device.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c index 3409c55ea88b..ff35cebb25e2 100644 --- a/drivers/infiniband/core/device.c +++ b/drivers/infiniband/core/device.c @@ -2159,14 +2159,16 @@ int ib_device_set_netdev(struct ib_device *ib_dev, struct net_device *ndev, return 0; } + if (old_ndev) + netdev_tracker_free(ndev, &pdata->netdev_tracker); if (ndev) - dev_hold(ndev); + netdev_hold(ndev, &pdata->netdev_tracker, GFP_ATOMIC); rcu_assign_pointer(pdata->netdev, ndev); spin_unlock_irqrestore(&pdata->netdev_lock, flags); add_ndev_hash(pdata); if (old_ndev) - dev_put(old_ndev); + __dev_put(old_ndev); return 0; } |