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wifi: cfg80211: hold wiphy mutex for send_interface

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Given all the locking rework in mac80211, we pretty much
need to get into the driver with the wiphy mutex held in
all callbacks. This is already mostly the case, but as
Johan reported, in the get_txpower it may not be true.

Lock the wiphy mutex around nl80211_send_iface(), then
is also around callers of nl80211_notify_iface(). This
is easy to do, fixes the problem, and aligns the locking
between various calls to it in different parts of the
code of cfg80211.

Fixes: 0e8185ce1d ("wifi: mac80211: check wiphy mutex in ops")
Reported-by: Johan Hovold <johan@kernel.org>
Closes: https://lore.kernel.org/r/ZVOXX6qg4vXEx8dX@hovoldconsulting.com
Tested-by: Johan Hovold <johan+linaro@kernel.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2023-11-15 13:06:16 +01:00
parent 8e2f6f2366
commit 103317670e
2 changed files with 7 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
net/wireless/core.c
View file

@ -191,13 +191,13 @@ int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
return err;
}
wiphy_lock(&rdev->wiphy);
list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
if (!wdev->netdev)
continue;
nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
}
wiphy_lock(&rdev->wiphy);
nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
wiphy_net_set(&rdev->wiphy, net);
@ -206,13 +206,13 @@ int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
WARN_ON(err);
nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
wiphy_unlock(&rdev->wiphy);
list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
if (!wdev->netdev)
continue;
nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
}
wiphy_unlock(&rdev->wiphy);
return 0;
}

5
net/wireless/nl80211.c
View file

@ -3822,6 +3822,8 @@ static int nl80211_send_iface(struct sk_buff *msg, u32 portid, u32 seq, int flag
struct net_device *dev = wdev->netdev;
void *hdr;
lockdep_assert_wiphy(&rdev->wiphy);
WARN_ON(cmd != NL80211_CMD_NEW_INTERFACE &&
cmd != NL80211_CMD_DEL_INTERFACE &&
cmd != NL80211_CMD_SET_INTERFACE);
@ -3989,6 +3991,7 @@ static int nl80211_dump_interface(struct sk_buff *skb, struct netlink_callback *
if_idx = 0;
wiphy_lock(&rdev->wiphy);
list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
if (if_idx < if_start) {
if_idx++;
@ -3998,10 +4001,12 @@ static int nl80211_dump_interface(struct sk_buff *skb, struct netlink_callback *
cb->nlh->nlmsg_seq, NLM_F_MULTI,
rdev, wdev,
NL80211_CMD_NEW_INTERFACE) < 0) {
wiphy_unlock(&rdev->wiphy);
goto out;
}
if_idx++;
}
wiphy_unlock(&rdev->wiphy);
wp_idx++;
}