From: Johannes Berg johannes.berg@intel.com
stable inclusion from stable-5.10.77 commit 4c22227e39c7a0b4dab55617ee8d34d171fab8d4 bugzilla: 185677 https://gitee.com/openeuler/kernel/issues/I4IAP7
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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commit 09b1d5dc6ce1c9151777f6c4e128a59457704c97 upstream.
The management registrations locking was broken, the list was locked for each wdev, but cfg80211_mgmt_registrations_update() iterated it without holding all the correct spinlocks, causing list corruption.
Rather than trying to fix it with fine-grained locking, just move the lock to the wiphy/rdev (still need the list on each wdev), we already need to hold the wdev lock to change it, so there's no contention on the lock in any case. This trivially fixes the bug since we hold one wdev's lock already, and now will hold the lock that protects all lists.
Cc: stable@vger.kernel.org Reported-by: Jouni Malinen j@w1.fi Fixes: 6cd536fe62ef ("cfg80211: change internal management frame registration API") Link: https://lore.kernel.org/r/20211025133111.5cf733eab0f4.I7b0abb0494ab712f74e2e... Signed-off-by: Johannes Berg johannes.berg@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Chen Jun chenjun102@huawei.com Acked-by: Weilong Chen chenweilong@huawei.com
Signed-off-by: Chen Jun chenjun102@huawei.com --- include/net/cfg80211.h | 2 -- net/wireless/core.c | 2 +- net/wireless/core.h | 2 ++ net/wireless/mlme.c | 26 ++++++++++++++------------ 4 files changed, 17 insertions(+), 15 deletions(-)
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h index 8a1bf2dbadd0..2a819be384a7 100644 --- a/include/net/cfg80211.h +++ b/include/net/cfg80211.h @@ -5202,7 +5202,6 @@ struct cfg80211_cqm_config; * netdev and may otherwise be used by driver read-only, will be update * by cfg80211 on change_interface * @mgmt_registrations: list of registrations for management frames - * @mgmt_registrations_lock: lock for the list * @mgmt_registrations_need_update: mgmt registrations were updated, * need to propagate the update to the driver * @mtx: mutex used to lock data in this struct, may be used by drivers @@ -5249,7 +5248,6 @@ struct wireless_dev { u32 identifier;
struct list_head mgmt_registrations; - spinlock_t mgmt_registrations_lock; u8 mgmt_registrations_need_update:1;
struct mutex mtx; diff --git a/net/wireless/core.c b/net/wireless/core.c index 240282c083aa..3f4554723761 100644 --- a/net/wireless/core.c +++ b/net/wireless/core.c @@ -501,6 +501,7 @@ struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv, INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk); INIT_WORK(&rdev->mgmt_registrations_update_wk, cfg80211_mgmt_registrations_update_wk); + spin_lock_init(&rdev->mgmt_registrations_lock);
#ifdef CONFIG_CFG80211_DEFAULT_PS rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; @@ -1256,7 +1257,6 @@ void cfg80211_init_wdev(struct wireless_dev *wdev) INIT_LIST_HEAD(&wdev->event_list); spin_lock_init(&wdev->event_lock); INIT_LIST_HEAD(&wdev->mgmt_registrations); - spin_lock_init(&wdev->mgmt_registrations_lock); INIT_LIST_HEAD(&wdev->pmsr_list); spin_lock_init(&wdev->pmsr_lock); INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk); diff --git a/net/wireless/core.h b/net/wireless/core.h index 7df91f940212..a3362a32acb3 100644 --- a/net/wireless/core.h +++ b/net/wireless/core.h @@ -101,6 +101,8 @@ struct cfg80211_registered_device { struct work_struct propagate_cac_done_wk;
struct work_struct mgmt_registrations_update_wk; + /* lock for all wdev lists */ + spinlock_t mgmt_registrations_lock;
/* must be last because of the way we do wiphy_priv(), * and it should at least be aligned to NETDEV_ALIGN */ diff --git a/net/wireless/mlme.c b/net/wireless/mlme.c index 0ac820780437..6dcfc5a34874 100644 --- a/net/wireless/mlme.c +++ b/net/wireless/mlme.c @@ -448,9 +448,9 @@ static void cfg80211_mgmt_registrations_update(struct wireless_dev *wdev)
ASSERT_RTNL();
- spin_lock_bh(&wdev->mgmt_registrations_lock); + spin_lock_bh(&rdev->mgmt_registrations_lock); if (!wdev->mgmt_registrations_need_update) { - spin_unlock_bh(&wdev->mgmt_registrations_lock); + spin_unlock_bh(&rdev->mgmt_registrations_lock); return; }
@@ -475,7 +475,7 @@ static void cfg80211_mgmt_registrations_update(struct wireless_dev *wdev) rcu_read_unlock();
wdev->mgmt_registrations_need_update = 0; - spin_unlock_bh(&wdev->mgmt_registrations_lock); + spin_unlock_bh(&rdev->mgmt_registrations_lock);
rdev_update_mgmt_frame_registrations(rdev, wdev, &upd); } @@ -499,6 +499,7 @@ int cfg80211_mlme_register_mgmt(struct wireless_dev *wdev, u32 snd_portid, int match_len, bool multicast_rx, struct netlink_ext_ack *extack) { + struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); struct cfg80211_mgmt_registration *reg, *nreg; int err = 0; u16 mgmt_type; @@ -544,7 +545,7 @@ int cfg80211_mlme_register_mgmt(struct wireless_dev *wdev, u32 snd_portid, if (!nreg) return -ENOMEM;
- spin_lock_bh(&wdev->mgmt_registrations_lock); + spin_lock_bh(&rdev->mgmt_registrations_lock);
list_for_each_entry(reg, &wdev->mgmt_registrations, list) { int mlen = min(match_len, reg->match_len); @@ -579,7 +580,7 @@ int cfg80211_mlme_register_mgmt(struct wireless_dev *wdev, u32 snd_portid, list_add(&nreg->list, &wdev->mgmt_registrations); } wdev->mgmt_registrations_need_update = 1; - spin_unlock_bh(&wdev->mgmt_registrations_lock); + spin_unlock_bh(&rdev->mgmt_registrations_lock);
cfg80211_mgmt_registrations_update(wdev);
@@ -587,7 +588,7 @@ int cfg80211_mlme_register_mgmt(struct wireless_dev *wdev, u32 snd_portid,
out: kfree(nreg); - spin_unlock_bh(&wdev->mgmt_registrations_lock); + spin_unlock_bh(&rdev->mgmt_registrations_lock);
return err; } @@ -598,7 +599,7 @@ void cfg80211_mlme_unregister_socket(struct wireless_dev *wdev, u32 nlportid) struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); struct cfg80211_mgmt_registration *reg, *tmp;
- spin_lock_bh(&wdev->mgmt_registrations_lock); + spin_lock_bh(&rdev->mgmt_registrations_lock);
list_for_each_entry_safe(reg, tmp, &wdev->mgmt_registrations, list) { if (reg->nlportid != nlportid) @@ -611,7 +612,7 @@ void cfg80211_mlme_unregister_socket(struct wireless_dev *wdev, u32 nlportid) schedule_work(&rdev->mgmt_registrations_update_wk); }
- spin_unlock_bh(&wdev->mgmt_registrations_lock); + spin_unlock_bh(&rdev->mgmt_registrations_lock);
if (nlportid && rdev->crit_proto_nlportid == nlportid) { rdev->crit_proto_nlportid = 0; @@ -624,15 +625,16 @@ void cfg80211_mlme_unregister_socket(struct wireless_dev *wdev, u32 nlportid)
void cfg80211_mlme_purge_registrations(struct wireless_dev *wdev) { + struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); struct cfg80211_mgmt_registration *reg, *tmp;
- spin_lock_bh(&wdev->mgmt_registrations_lock); + spin_lock_bh(&rdev->mgmt_registrations_lock); list_for_each_entry_safe(reg, tmp, &wdev->mgmt_registrations, list) { list_del(®->list); kfree(reg); } wdev->mgmt_registrations_need_update = 1; - spin_unlock_bh(&wdev->mgmt_registrations_lock); + spin_unlock_bh(&rdev->mgmt_registrations_lock);
cfg80211_mgmt_registrations_update(wdev); } @@ -780,7 +782,7 @@ bool cfg80211_rx_mgmt_khz(struct wireless_dev *wdev, int freq, int sig_dbm, data = buf + ieee80211_hdrlen(mgmt->frame_control); data_len = len - ieee80211_hdrlen(mgmt->frame_control);
- spin_lock_bh(&wdev->mgmt_registrations_lock); + spin_lock_bh(&rdev->mgmt_registrations_lock);
list_for_each_entry(reg, &wdev->mgmt_registrations, list) { if (reg->frame_type != ftype) @@ -804,7 +806,7 @@ bool cfg80211_rx_mgmt_khz(struct wireless_dev *wdev, int freq, int sig_dbm, break; }
- spin_unlock_bh(&wdev->mgmt_registrations_lock); + spin_unlock_bh(&rdev->mgmt_registrations_lock);
trace_cfg80211_return_bool(result); return result;