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devlink: Protect devlink port list traversal

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Cited patch in fixes tag misses to protect port list traversal
while traversing per port reporter list.

Protect it using devlink instance lock.

Fixes: f4f5416601 ("devlink: Implement devlink health reporters on per-port basis")
Signed-off-by: Parav Pandit <parav@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Parav Pandit 2020-08-21 22:12:21 +03:00 committed by David S. Miller
parent 79604c5de2
commit 5d080b5064
1 changed files with 3 additions and 0 deletions
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3
net/core/devlink.c
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@ -5895,6 +5895,7 @@ devlink_nl_cmd_health_reporter_get_dumpit(struct sk_buff *msg,
list_for_each_entry(devlink, &devlink_list, list) {
if (!net_eq(devlink_net(devlink), sock_net(msg->sk)))
continue;
mutex_lock(&devlink->lock);
list_for_each_entry(port, &devlink->port_list, list) {
mutex_lock(&port->reporters_lock);
list_for_each_entry(reporter, &port->reporter_list, list) {
@ -5909,12 +5910,14 @@ devlink_nl_cmd_health_reporter_get_dumpit(struct sk_buff *msg,
NLM_F_MULTI);
if (err) {
mutex_unlock(&port->reporters_lock);
mutex_unlock(&devlink->lock);
goto out;
}
idx++;
}
mutex_unlock(&port->reporters_lock);
}
mutex_unlock(&devlink->lock);
}
out:
mutex_unlock(&devlink_mutex);