[ovs-dev] [PATCH] net: openvswitch: silence suspicious RCU usage warning

[Eelco Chaudron]

On 5 Aug 2020, at 9:19, xiangxia.m.yue at gmail.com wrote:

> From: Tonghao Zhang <xiangxia.m.yue at gmail.com>
>
> ovs_flow_tbl_destroy always is called from RCU callback
> or error path. It is no need to check if rcu_read_lock
> or lockdep_ovsl_is_held was held.
>
> ovs_dp_cmd_fill_info always is called with ovs_mutex,
> So use the rcu_dereference_ovsl instead of rcu_dereference
> in ovs_flow_tbl_masks_cache_size.
>
> Fixes: 9bf24f594c6a ("net: openvswitch: make masks cache size 
> configurable")
> Cc: Eelco Chaudron <echaudro at redhat.com>
> Reported-by: syzbot+c0eb9e7cdde04e4eb4be at syzkaller.appspotmail.com
> Reported-by: syzbot+f612c02823acb02ff9bc at syzkaller.appspotmail.com
> Signed-off-by: Tonghao Zhang <xiangxia.m.yue at gmail.com>

Thanks for fixing this, I was (am) on PTO so did not notice it earlier!

Cheers,

Eelco