If adding bridge sysfs fails, br->ifobj will be NULL, there is no need to delete its non-existent sysfs when deleting the bridge device, otherwise, it will cause a warning. So, when br->ifobj == NULL, directly return can fix this bug. br_sysfs_addbr: can't create group bridge4/bridge ------------[ cut here ]------------ sysfs group 'bridge' not found for kobject 'bridge4' WARNING: CPU: 2 PID: 9004 at fs/sysfs/group.c:279 sysfs_remove_group fs/sysfs/group.c:279 [inline] WARNING: CPU: 2 PID: 9004 at fs/sysfs/group.c:279 sysfs_remove_group+0x153/0x1b0 fs/sysfs/group.c:270 Modules linked in: iptable_nat ... Call Trace: br_dev_delete+0x112/0x190 net/bridge/br_if.c:384 br_dev_newlink net/bridge/br_netlink.c:1381 [inline] br_dev_newlink+0xdb/0x100 net/bridge/br_netlink.c:1362 __rtnl_newlink+0xe11/0x13f0 net/core/rtnetlink.c:3441 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3500 rtnetlink_rcv_msg+0x385/0x980 net/core/rtnetlink.c:5562 netlink_rcv_skb+0x134/0x3d0 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x4a0/0x6a0 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x793/0xc80 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0x139/0x170 net/socket.c:671 ____sys_sendmsg+0x658/0x7d0 net/socket.c:2353 ___sys_sendmsg+0xf8/0x170 net/socket.c:2407 __sys_sendmsg+0xd3/0x190 net/socket.c:2440 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported-by: Hulk Robot <hulkci@xxxxxxxxxx> Signed-off-by: Wang Hai <wanghai38@xxxxxxxxxx> --- net/bridge/br_sysfs_br.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/bridge/br_sysfs_br.c b/net/bridge/br_sysfs_br.c index 7db06e3f642a..1e9cbf31d904 100644 --- a/net/bridge/br_sysfs_br.c +++ b/net/bridge/br_sysfs_br.c @@ -991,6 +991,9 @@ void br_sysfs_delbr(struct net_device *dev) struct kobject *kobj = &dev->dev.kobj; struct net_bridge *br = netdev_priv(dev); + if (!br->ifobj) + return; + kobject_put(br->ifobj); sysfs_remove_bin_file(kobj, &bridge_forward); sysfs_remove_group(kobj, &bridge_group); -- 2.17.1
