[Bridge] [PATCH net-next 0/3] net: bridge: fix recent ioctl changes

Nikolay Aleksandrov razor at blackwall.org
Thu Aug 5 08:29:00 UTC 2021

From: Nikolay Aleksandrov <nikolay at nvidia.com>

These are three fixes for the recent bridge removal of ndo_do_ioctl
done by commit ad2f99aedf8f ("net: bridge: move bridge ioctls out of
.ndo_do_ioctl"). Patch 01 fixes a deadlock of the new bridge ioctl
hook lock and rtnl by taking a netdev reference and always taking the
bridge ioctl lock first then rtnl from within the bridge hook.
Patch 02 fixes old_deviceless() bridge calls device name argument, and
patch 03 checks in dev_ifsioc()'s SIOCBRADD/DELIF cases if the netdevice is
actually a bridge before interpreting its private ptr as net_bridge.

Patch 01 was tested by running old bridge-utils commands with lockdep
enabled. Patch 02 was tested again by using bridge-utils and using the
respective ioctl calls on a "up" bridge device. Patch 03 was tested by
using the addif ioctl on a non-bridge device (e.g. loopback).


Nikolay Aleksandrov (3):
  net: bridge: fix ioctl locking
  net: bridge: fix ioctl old_deviceless bridge argument
  net: core: don't call SIOCBRADD/DELIF for non-bridge devices

 net/bridge/br_if.c    |  4 +---
 net/bridge/br_ioctl.c | 39 +++++++++++++++++++++++++--------------
 net/core/dev_ioctl.c  |  9 ++++++++-
 3 files changed, 34 insertions(+), 18 deletions(-)


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