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Vlad Buslov 718cb09aaa vlan: Fix VLAN 0 memory leak 
The referenced commit intended to fix memleak of VLAN 0 that is implicitly
created on devices with NETIF_F_HW_VLAN_CTAG_FILTER feature. However, it
doesn't take into account that the feature can be re-set during the
netdevice lifetime which will cause memory leak if feature is disabled
during the device deletion as illustrated by [0]. Fix the leak by
unconditionally deleting VLAN 0 on NETDEV_DOWN event.

[0]:
> modprobe 8021q
> ip l set dev eth2 up
> ethtool -K eth2 rx-vlan-filter off
> modprobe -r mlx5_ib
> modprobe -r mlx5_core
> cat /sys/kernel/debug/kmemleak
unreferenced object 0xffff888103dcd900 (size 256):
  comm "ip", pid 1490, jiffies 4294907305 (age 325.364s)
  hex dump (first 32 bytes):
    00 80 5d 03 81 88 ff ff 00 00 00 00 00 00 00 00  ..].............
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<00000000899f3bb9>] kmalloc_trace+0x25/0x80
    [<000000002889a7a2>] vlan_vid_add+0xa0/0x210
    [<000000007177800e>] vlan_device_event+0x374/0x760 [8021q]
    [<000000009a0716b1>] notifier_call_chain+0x35/0xb0
    [<00000000bbf3d162>] __dev_notify_flags+0x58/0xf0
    [<0000000053d2b05d>] dev_change_flags+0x4d/0x60
    [<00000000982807e9>] do_setlink+0x28d/0x10a0
    [<0000000058c1be00>] __rtnl_newlink+0x545/0x980
    [<00000000e66c3bd9>] rtnl_newlink+0x44/0x70
    [<00000000a2cc5970>] rtnetlink_rcv_msg+0x29c/0x390
    [<00000000d307d1e4>] netlink_rcv_skb+0x54/0x100
    [<00000000259d16f9>] netlink_unicast+0x1f6/0x2c0
    [<000000007ce2afa1>] netlink_sendmsg+0x232/0x4a0
    [<00000000f3f4bb39>] sock_sendmsg+0x38/0x60
    [<000000002f9c0624>] ____sys_sendmsg+0x1e3/0x200
    [<00000000d6ff5520>] ___sys_sendmsg+0x80/0xc0
unreferenced object 0xffff88813354fde0 (size 32):
  comm "ip", pid 1490, jiffies 4294907305 (age 325.364s)
  hex dump (first 32 bytes):
    a0 d9 dc 03 81 88 ff ff a0 d9 dc 03 81 88 ff ff  ................
    81 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<00000000899f3bb9>] kmalloc_trace+0x25/0x80
    [<000000002da64724>] vlan_vid_add+0xdf/0x210
    [<000000007177800e>] vlan_device_event+0x374/0x760 [8021q]
    [<000000009a0716b1>] notifier_call_chain+0x35/0xb0
    [<00000000bbf3d162>] __dev_notify_flags+0x58/0xf0
    [<0000000053d2b05d>] dev_change_flags+0x4d/0x60
    [<00000000982807e9>] do_setlink+0x28d/0x10a0
    [<0000000058c1be00>] __rtnl_newlink+0x545/0x980
    [<00000000e66c3bd9>] rtnl_newlink+0x44/0x70
    [<00000000a2cc5970>] rtnetlink_rcv_msg+0x29c/0x390
    [<00000000d307d1e4>] netlink_rcv_skb+0x54/0x100
    [<00000000259d16f9>] netlink_unicast+0x1f6/0x2c0
    [<000000007ce2afa1>] netlink_sendmsg+0x232/0x4a0
    [<00000000f3f4bb39>] sock_sendmsg+0x38/0x60
    [<000000002f9c0624>] ____sys_sendmsg+0x1e3/0x200
    [<00000000d6ff5520>] ___sys_sendmsg+0x80/0xc0

Fixes: efc73f4bbc ("net: Fix memory leak - vlan_info struct")
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Vlad Buslov <vladbu@nvidia.com>
Link: https://lore.kernel.org/r/20230808093521.1468929-1-vladbu@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2023-08-09 13:44:27 -07:00
..
Kconfig treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
Makefile net: remove blank lines at end of file 2018-07-24 14:10:43 -07:00
vlan.c vlan: Fix VLAN 0 memory leak 2023-08-09 13:44:27 -07:00
vlan.h vlan: introduce vlan_dev_free_egress_priority 2022-02-09 13:33:39 +00:00
vlan_core.c net: gro: skb_gro_header helper function 2022-08-25 10:33:21 +02:00
vlan_dev.c vlan: fix a potential uninit-value in vlan_dev_hard_start_xmit() 2023-05-17 12:55:39 +01:00
vlan_gvrp.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
vlan_mvrp.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
vlan_netlink.c vlan: fix memory leak in vlan_newlink() 2022-07-09 12:26:59 +01:00
vlanproc.c vlan: use correct format characters 2022-03-17 16:34:49 -07:00
vlanproc.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00