From 4d45145ba6e2e1c0eba4ebda7d6273319191f4e8 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Tue, 6 Jun 2023 14:49:24 +0200 Subject: [PATCH] wifi: cfg80211: hold wiphy lock when sending wiphy Sending the wiphy out might cause calls to the driver, notably get_txq_stats() and get_antenna(). These aren't very important, since the normally have their own locks and/or just send out static data, but if the contract should be that the wiphy lock is always held, these are also affected. Fix that. Signed-off-by: Johannes Berg --- net/wireless/core.c | 8 ++++++++ net/wireless/nl80211.c | 3 +++ 2 files changed, 11 insertions(+) diff --git a/net/wireless/core.c b/net/wireless/core.c index a04b6ee..151a856 100644 --- a/net/wireless/core.c +++ b/net/wireless/core.c @@ -129,6 +129,7 @@ int cfg80211_dev_rename(struct cfg80211_registered_device *rdev, int result; ASSERT_RTNL(); + lockdep_assert_wiphy(&rdev->wiphy); /* Ignore nop renames */ if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0) @@ -195,6 +196,8 @@ int cfg80211_switch_netns(struct cfg80211_registered_device *rdev, 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); @@ -203,6 +206,8 @@ 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; @@ -941,8 +946,10 @@ int wiphy_register(struct wiphy *wiphy) rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH; rtnl_lock(); + wiphy_lock(&rdev->wiphy); res = device_add(&rdev->wiphy.dev); if (res) { + wiphy_unlock(&rdev->wiphy); rtnl_unlock(); return res; } @@ -956,6 +963,7 @@ int wiphy_register(struct wiphy *wiphy) cfg80211_debugfs_rdev_add(rdev); nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); + wiphy_unlock(&rdev->wiphy); /* set up regulatory info */ wiphy_regulatory_register(wiphy); diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index 087d60c..a52bd73 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -3081,6 +3081,7 @@ static int nl80211_dump_wiphy(struct sk_buff *skb, struct netlink_callback *cb) if (state->filter_wiphy != -1 && state->filter_wiphy != rdev->wiphy_idx) continue; + wiphy_lock(&rdev->wiphy); /* attempt to fit multiple wiphy data chunks into the skb */ do { ret = nl80211_send_wiphy(rdev, NL80211_CMD_NEW_WIPHY, @@ -3107,6 +3108,7 @@ static int nl80211_dump_wiphy(struct sk_buff *skb, struct netlink_callback *cb) cb->min_dump_alloc < 4096) { cb->min_dump_alloc = 4096; state->split_start = 0; + wiphy_unlock(&rdev->wiphy); rtnl_unlock(); return 1; } @@ -3114,6 +3116,7 @@ static int nl80211_dump_wiphy(struct sk_buff *skb, struct netlink_callback *cb) break; } } while (state->split_start > 0); + wiphy_unlock(&rdev->wiphy); break; } rtnl_unlock(); -- 2.7.4