Merge tag 'net-6.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

Pull networking fixes from Jakub Kicinski:
 "Including fixes from netfilter, and wifi.

Current release - regressions:

   - Revert "net/sched: taprio: make qdisc_leaf() see the
     per-netdev-queue pfifo child qdiscs", it may cause crashes when the
     qdisc is reconfigured

   - inet: ping: fix splat due to packet allocation refactoring in inet

   - tcp: clean up kernel listener's reqsk in inet_twsk_purge(), fix UAF
     due to races when per-netns hash table is used

  Current release - new code bugs:

   - eth: adin1110: check in netdev_event that netdev belongs to driver

   - fixes for PTR_ERR() vs NULL bugs in driver code, from Dan and co.

  Previous releases - regressions:

   - ipv4: handle attempt to delete multipath route when fib_info
     contains an nh reference, avoid oob access

   - wifi: fix handful of bugs in the new Multi-BSSID code

   - wifi: mt76: fix rate reporting / throughput regression on mt7915
     and newer, fix checksum offload

   - wifi: iwlwifi: mvm: fix double list_add at
     iwl_mvm_mac_wake_tx_queue (other cases)

   - wifi: mac80211: do not drop packets smaller than the LLC-SNAP
     header on fast-rx

  Previous releases - always broken:

   - ieee802154: don't warn zero-sized raw_sendmsg()

   - ipv6: ping: fix wrong checksum for large frames

   - mctp: prevent double key removal and unref

   - tcp/udp: fix memory leaks and races around IPV6_ADDRFORM

   - hv_netvsc: fix race between VF offering and VF association message

  Misc:

   - remove -Warray-bounds silencing in the drivers, compilers fixed"

* tag 'net-6.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (73 commits)
  sunhme: fix an IS_ERR() vs NULL check in probe
  net: marvell: prestera: fix a couple NULL vs IS_ERR() checks
  kcm: avoid potential race in kcm_tx_work
  tcp: Clean up kernel listener's reqsk in inet_twsk_purge()
  net: phy: micrel: Fixes FIELD_GET assertion
  openvswitch: add nf_ct_is_confirmed check before assigning the helper
  tcp: Fix data races around icsk->icsk_af_ops.
  ipv6: Fix data races around sk->sk_prot.
  tcp/udp: Call inet6_destroy_sock() in IPv6 sk->sk_destruct().
  udp: Call inet6_destroy_sock() in setsockopt(IPV6_ADDRFORM).
  tcp/udp: Fix memory leak in ipv6_renew_options().
  mctp: prevent double key removal and unref
  selftests: netfilter: Fix nft_fib.sh for all.rp_filter=1
  netfilter: rpfilter/fib: Populate flowic_l3mdev field
  selftests: netfilter: Test reverse path filtering
  net/mlx5: Make ASO poll CQ usable in atomic context
  tcp: cdg: allow tcp_cdg_release() to be called multiple times
  inet: ping: fix recent breakage
  ipv6: ping: fix wrong checksum for large frames
  net: ethernet: ti: am65-cpsw: set correct devlink flavour for unused ports
  ...

1 files changed, 50 insertions, 27 deletions

diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index 5382fc2003db..806a5f1330ff 100644
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -143,18 +143,12 @@ static inline void bss_ref_get(struct cfg80211_registered_device *rdev,
 	lockdep_assert_held(&rdev->bss_lock);
 
 	bss->refcount++;
-	if (bss->pub.hidden_beacon_bss) {
-		bss = container_of(bss->pub.hidden_beacon_bss,
-				   struct cfg80211_internal_bss,
-				   pub);
-		bss->refcount++;
-	}
-	if (bss->pub.transmitted_bss) {
-		bss = container_of(bss->pub.transmitted_bss,
-				   struct cfg80211_internal_bss,
-				   pub);
-		bss->refcount++;
-	}
+
+	if (bss->pub.hidden_beacon_bss)
+		bss_from_pub(bss->pub.hidden_beacon_bss)->refcount++;
+
+	if (bss->pub.transmitted_bss)
+		bss_from_pub(bss->pub.transmitted_bss)->refcount++;
 }
 
 static inline void bss_ref_put(struct cfg80211_registered_device *rdev,
@@ -304,7 +298,8 @@ static size_t cfg80211_gen_new_ie(const u8 *ie, size_t ielen,
 	tmp_old = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen);
 	tmp_old = (tmp_old) ? tmp_old + tmp_old[1] + 2 : ie;
 
-	while (tmp_old + tmp_old[1] + 2 - ie <= ielen) {
+	while (tmp_old + 2 - ie <= ielen &&
+	       tmp_old + tmp_old[1] + 2 - ie <= ielen) {
 		if (tmp_old[0] == 0) {
 			tmp_old++;
 			continue;
@@ -364,7 +359,8 @@ static size_t cfg80211_gen_new_ie(const u8 *ie, size_t ielen,
 	 * copied to new ie, skip ssid, capability, bssid-index ie
 	 */
 	tmp_new = sub_copy;
-	while (tmp_new + tmp_new[1] + 2 - sub_copy <= subie_len) {
+	while (tmp_new + 2 - sub_copy <= subie_len &&
+	       tmp_new + tmp_new[1] + 2 - sub_copy <= subie_len) {
 		if (!(tmp_new[0] == WLAN_EID_NON_TX_BSSID_CAP ||
 		      tmp_new[0] == WLAN_EID_SSID)) {
 			memcpy(pos, tmp_new, tmp_new[1] + 2);
@@ -427,6 +423,15 @@ cfg80211_add_nontrans_list(struct cfg80211_bss *trans_bss,
 
 	rcu_read_unlock();
 
+	/*
+	 * This is a bit weird - it's not on the list, but already on another
+	 * one! The only way that could happen is if there's some BSSID/SSID
+	 * shared by multiple APs in their multi-BSSID profiles, potentially
+	 * with hidden SSID mixed in ... ignore it.
+	 */
+	if (!list_empty(&nontrans_bss->nontrans_list))
+		return -EINVAL;
+
 	/* add to the list */
 	list_add_tail(&nontrans_bss->nontrans_list, &trans_bss->nontrans_list);
 	return 0;
@@ -1602,6 +1607,23 @@ struct cfg80211_non_tx_bss {
 	u8 bssid_index;
 };
 
+static void cfg80211_update_hidden_bsses(struct cfg80211_internal_bss *known,
+					 const struct cfg80211_bss_ies *new_ies,
+					 const struct cfg80211_bss_ies *old_ies)
+{
+	struct cfg80211_internal_bss *bss;
+
+	/* Assign beacon IEs to all sub entries */
+	list_for_each_entry(bss, &known->hidden_list, hidden_list) {
+		const struct cfg80211_bss_ies *ies;
+
+		ies = rcu_access_pointer(bss->pub.beacon_ies);
+		WARN_ON(ies != old_ies);
+
+		rcu_assign_pointer(bss->pub.beacon_ies, new_ies);
+	}
+}
+
 static bool
 cfg80211_update_known_bss(struct cfg80211_registered_device *rdev,
 			  struct cfg80211_internal_bss *known,
@@ -1625,7 +1647,6 @@ cfg80211_update_known_bss(struct cfg80211_registered_device *rdev,
 			kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
 	} else if (rcu_access_pointer(new->pub.beacon_ies)) {
 		const struct cfg80211_bss_ies *old;
-		struct cfg80211_internal_bss *bss;
 
 		if (known->pub.hidden_beacon_bss &&
 		    !list_empty(&known->hidden_list)) {
@@ -1653,16 +1674,7 @@ cfg80211_update_known_bss(struct cfg80211_registered_device *rdev,
 		if (old == rcu_access_pointer(known->pub.ies))
 			rcu_assign_pointer(known->pub.ies, new->pub.beacon_ies);
 
-		/* Assign beacon IEs to all sub entries */
-		list_for_each_entry(bss, &known->hidden_list, hidden_list) {
-			const struct cfg80211_bss_ies *ies;
-
-			ies = rcu_access_pointer(bss->pub.beacon_ies);
-			WARN_ON(ies != old);
-
-			rcu_assign_pointer(bss->pub.beacon_ies,
-					   new->pub.beacon_ies);
-		}
+		cfg80211_update_hidden_bsses(known, new->pub.beacon_ies, old);
 
 		if (old)
 			kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
@@ -1739,6 +1751,8 @@ cfg80211_bss_update(struct cfg80211_registered_device *rdev,
 		new->refcount = 1;
 		INIT_LIST_HEAD(&new->hidden_list);
 		INIT_LIST_HEAD(&new->pub.nontrans_list);
+		/* we'll set this later if it was non-NULL */
+		new->pub.transmitted_bss = NULL;
 
 		if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
 			hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN);
@@ -2021,10 +2035,15 @@ cfg80211_inform_single_bss_data(struct wiphy *wiphy,
 		spin_lock_bh(&rdev->bss_lock);
 		if (cfg80211_add_nontrans_list(non_tx_data->tx_bss,
 					       &res->pub)) {
-			if (__cfg80211_unlink_bss(rdev, res))
+			if (__cfg80211_unlink_bss(rdev, res)) {
 				rdev->bss_generation++;
+				res = NULL;
+			}
 		}
 		spin_unlock_bh(&rdev->bss_lock);
+
+		if (!res)
+			return NULL;
 	}
 
 	trace_cfg80211_return_bss(&res->pub);
@@ -2143,6 +2162,8 @@ static void cfg80211_parse_mbssid_data(struct wiphy *wiphy,
 	for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, ie, ielen) {
 		if (elem->datalen < 4)
 			continue;
+		if (elem->data[0] < 1 || (int)elem->data[0] > 8)
+			continue;
 		for_each_element(sub, elem->data + 1, elem->datalen - 1) {
 			u8 profile_len;
 
@@ -2279,7 +2300,7 @@ cfg80211_update_notlisted_nontrans(struct wiphy *wiphy,
 	size_t new_ie_len;
 	struct cfg80211_bss_ies *new_ies;
 	const struct cfg80211_bss_ies *old;
-	u8 cpy_len;
+	size_t cpy_len;
 
 	lockdep_assert_held(&wiphy_to_rdev(wiphy)->bss_lock);
 
@@ -2346,6 +2367,8 @@ cfg80211_update_notlisted_nontrans(struct wiphy *wiphy,
 	} else {
 		old = rcu_access_pointer(nontrans_bss->beacon_ies);
 		rcu_assign_pointer(nontrans_bss->beacon_ies, new_ies);
+		cfg80211_update_hidden_bsses(bss_from_pub(nontrans_bss),
+					     new_ies, old);
 		rcu_assign_pointer(nontrans_bss->ies, new_ies);
 		if (old)
 			kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);