linux-stable.git/net/mac80211, branch linux-4.9.y

wifi: mac80211: Fix ack frame idr leak when mesh has no route

2022-12-08T10:15:39+00:00

[ Upstream commit 39e7b5de9853bd92ddbfa4b14165babacd7da0ba ]

When trying to transmit an data frame with tx_status to a destination
that have no route in the mesh, then it is dropped without recrediting
the ack_status_frames idr.

Once it is exhausted, wpa_supplicant starts failing to do SAE with
NL80211_CMD_FRAME and logs "nl80211: Frame command failed".

Use ieee80211_free_txskb() instead of kfree_skb() to fix it.

Signed-off-by: Nicolas Cavallari 
Link: https://lore.kernel.org/r/20221027140133.1504-1-nicolas.cavallari@green-communications.fr
Signed-off-by: Johannes Berg 
Signed-off-by: Sasha Levin

wifi: mac80211: allow bw change during channel switch in mesh

2022-10-26T11:15:39+00:00

[ Upstream commit 6b75f133fe05c36c52d691ff21545d5757fff721 ]

From 'IEEE Std 802.11-2020 section 11.8.8.4.1':
  The mesh channel switch may be triggered by the need to avoid
  interference to a detected radar signal, or to reassign mesh STA
  channels to ensure the MBSS connectivity.

  A 20/40 MHz MBSS may be changed to a 20 MHz MBSS and a 20 MHz
  MBSS may be changed to a 20/40 MHz MBSS.

Since the standard allows the change of bandwidth during
the channel switch in mesh, remove the bandwidth check present in
ieee80211_set_csa_beacon.

Fixes: c6da674aff94 ("{nl,cfg,mac}80211: enable the triggering of CSA frame in mesh")
Signed-off-by: Hari Chandrakanthan 
Link: https://lore.kernel.org/r/1658903549-21218-1-git-send-email-quic_haric@quicinc.com
Signed-off-by: Johannes Berg 
Signed-off-by: Sasha Levin

wifi: mac80211: Fix UAF in ieee80211_scan_rx()

2022-09-28T08:55:45+00:00

[ Upstream commit 60deb9f10eec5c6a20252ed36238b55d8b614a2c ]

ieee80211_scan_rx() tries to access scan_req->flags after a
null check, but a UAF is observed when the scan is completed
and __ieee80211_scan_completed() executes, which then calls
cfg80211_scan_done() leading to the freeing of scan_req.

Since scan_req is rcu_dereference()'d, prevent the racing in
__ieee80211_scan_completed() by ensuring that from mac80211's
POV it is no longer accessed from an RCU read critical section
before we call cfg80211_scan_done().

Cc: stable@vger.kernel.org
Link: https://syzkaller.appspot.com/bug?extid=f9acff9bf08a845f225d
Reported-by: syzbot+f9acff9bf08a845f225d@syzkaller.appspotmail.com
Suggested-by: Johannes Berg 
Signed-off-by: Siddh Raman Pant 
Link: https://lore.kernel.org/r/20220819200340.34826-1-code@siddh.me
Signed-off-by: Johannes Berg 
Signed-off-by: Sasha Levin

wifi: mac80211: Don't finalize CSA in IBSS mode if state is disconnected

2022-09-15T10:39:45+00:00

commit 15bc8966b6d3a5b9bfe4c9facfa02f2b69b1e5f0 upstream.

When we are not connected to a channel, sending channel "switch"
announcement doesn't make any sense.

The BSS list is empty in that case. This causes the for loop in
cfg80211_get_bss() to be bypassed, so the function returns NULL
(check line 1424 of net/wireless/scan.c), causing the WARN_ON()
in ieee80211_ibss_csa_beacon() to get triggered (check line 500
of net/mac80211/ibss.c), which was consequently reported on the
syzkaller dashboard.

Thus, check if we have an existing connection before generating
the CSA beacon in ieee80211_ibss_finish_csa().

Cc: stable@vger.kernel.org
Fixes: cd7760e62c2a ("mac80211: add support for CSA in IBSS mode")
Link: https://syzkaller.appspot.com/bug?id=05603ef4ae8926761b678d2939a3b2ad28ab9ca6
Reported-by: syzbot+b6c9fe29aefe68e4ad34@syzkaller.appspotmail.com
Signed-off-by: Siddh Raman Pant 
Tested-by: syzbot+b6c9fe29aefe68e4ad34@syzkaller.appspotmail.com
Link: https://lore.kernel.org/r/20220814151512.9985-1-code@siddh.me
Signed-off-by: Johannes Berg 
Signed-off-by: Greg Kroah-Hartman

mac80211: upgrade passive scan to active scan on DFS channels after beacon rx

2022-06-14T14:52:35+00:00

commit b041b7b9de6e1d4362de855ab90f9d03ef323edd upstream.

In client mode, we can't connect to hidden SSID APs or SSIDs not advertised
in beacons on DFS channels, since we're forced to passive scan. Fix this by
sending out a probe request immediately after the first beacon, if active
scan was requested by the user.

Cc: stable@vger.kernel.org
Reported-by: Catrinel Catrinescu 
Signed-off-by: Felix Fietkau 
Link: https://lore.kernel.org/r/20220420104907.36275-1-nbd@nbd.name
Signed-off-by: Johannes Berg 
Signed-off-by: Greg Kroah-Hartman

wifi: mac80211: fix use-after-free in chanctx code

2022-06-14T14:52:34+00:00

commit 2965c4cdf7ad9ce0796fac5e57debb9519ea721e upstream.

In ieee80211_vif_use_reserved_context(), when we have an
old context and the new context's replace_state is set to
IEEE80211_CHANCTX_REPLACE_NONE, we free the old context
in ieee80211_vif_use_reserved_reassign(). Therefore, we
cannot check the old_ctx anymore, so we should set it to
NULL after this point.

However, since the new_ctx replace state is clearly not
IEEE80211_CHANCTX_REPLACES_OTHER, we're not going to do
anything else in this function and can just return to
avoid accessing the freed old_ctx.

Cc: stable@vger.kernel.org
Fixes: 5bcae31d9cb1 ("mac80211: implement multi-vif in-place reservations")
Signed-off-by: Johannes Berg 
Signed-off-by: Kalle Valo 
Link: https://lore.kernel.org/r/20220601091926.df419d91b165.I17a9b3894ff0b8323ce2afdb153b101124c821e5@changeid
Signed-off-by: Greg Kroah-Hartman

mac80211: fix rx reordering with non explicit / psmp ack policy

2022-05-25T06:39:50+00:00

[ Upstream commit 5e469ed9764d4722c59562da13120bd2dc6834c5 ]

When the QoS ack policy was set to non explicit / psmp ack, frames are treated
as not being part of a BA session, which causes extra latency on reordering.
Fix this by only bypassing reordering for packets with no-ack policy

Signed-off-by: Felix Fietkau 
Link: https://lore.kernel.org/r/20220420105038.36443-1-nbd@nbd.name
Signed-off-by: Johannes Berg 
Signed-off-by: Sasha Levin

mac80211: fix potential double free on mesh join

2022-03-28T06:06:06+00:00

commit 4a2d4496e15ea5bb5c8e83b94ca8ca7fb045e7d3 upstream.

While commit 6a01afcf8468 ("mac80211: mesh: Free ie data when leaving
mesh") fixed a memory leak on mesh leave / teardown it introduced a
potential memory corruption caused by a double free when rejoining the
mesh:

  ieee80211_leave_mesh()
  -> kfree(sdata->u.mesh.ie);
  ...
  ieee80211_join_mesh()
  -> copy_mesh_setup()
     -> old_ie = ifmsh->ie;
     -> kfree(old_ie);

This double free / kernel panics can be reproduced by using wpa_supplicant
with an encrypted mesh (if set up without encryption via "iw" then
ifmsh->ie is always NULL, which avoids this issue). And then calling:

  $ iw dev mesh0 mesh leave
  $ iw dev mesh0 mesh join my-mesh

Note that typically these commands are not used / working when using
wpa_supplicant. And it seems that wpa_supplicant or wpa_cli are going
through a NETDEV_DOWN/NETDEV_UP cycle between a mesh leave and mesh join
where the NETDEV_UP resets the mesh.ie to NULL via a memcpy of
default_mesh_setup in cfg80211_netdev_notifier_call, which then avoids
the memory corruption, too.

The issue was first observed in an application which was not using
wpa_supplicant but "Senf" instead, which implements its own calls to
nl80211.

Fixing the issue by removing the kfree()'ing of the mesh IE in the mesh
join function and leaving it solely up to the mesh leave to free the
mesh IE.

Cc: stable@vger.kernel.org
Fixes: 6a01afcf8468 ("mac80211: mesh: Free ie data when leaving mesh")
Reported-by: Matthias Kretschmer 
Signed-off-by: Linus Lüssing 
Tested-by: Mathias Kretschmer 
Link: https://lore.kernel.org/r/20220310183513.28589-1-linus.luessing@c0d3.blue
Signed-off-by: Johannes Berg 
Signed-off-by: Greg Kroah-Hartman

mac80211: fix forwarded mesh frames AC & queue selection

2022-03-08T18:00:58+00:00

commit 859ae7018316daa4adbc496012dcbbb458d7e510 upstream.

There are two problems with the current code that have been highlighted
with the AQL feature that is now enbaled by default.

First problem is in ieee80211_rx_h_mesh_fwding(),
ieee80211_select_queue_80211() is used on received packets to choose
the sending AC queue of the forwarding packet although this function
should only be called on TX packet (it uses ieee80211_tx_info).
This ends with forwarded mesh packets been sent on unrelated random AC
queue. To fix that, AC queue can directly be infered from skb->priority
which has been extracted from QOS info (see ieee80211_parse_qos()).

Second problem is the value of queue_mapping set on forwarded mesh
frames via skb_set_queue_mapping() is not the AC of the packet but a
hardware queue index. This may or may not work depending on AC to HW
queue mapping which is driver specific.

Both of these issues lead to improper AC selection while forwarding
mesh packets but more importantly due to improper airtime accounting
(which is done on a per STA, per AC basis) caused traffic stall with
the introduction of AQL.

Fixes: cf44012810cc ("mac80211: fix unnecessary frame drops in mesh fwding")
Fixes: d3c1597b8d1b ("mac80211: fix forwarded mesh frame queue mapping")
Co-developed-by: Remi Pommarel 
Signed-off-by: Remi Pommarel 
Signed-off-by: Nicolas Escande 
Link: https://lore.kernel.org/r/20220214173214.368862-1-nico.escande@gmail.com
Signed-off-by: Johannes Berg 
Signed-off-by: Greg Kroah-Hartman

mac80211: initialize variable have_higher_than_11mbit

2022-01-11T12:38:11+00:00

commit 68a18ad71378a56858141c4449e02a30c829763e upstream.

Clang static analysis reports this warnings

mlme.c:5332:7: warning: Branch condition evaluates to a
  garbage value
    have_higher_than_11mbit)
    ^~~~~~~~~~~~~~~~~~~~~~~

have_higher_than_11mbit is only set to true some of the time in
ieee80211_get_rates() but is checked all of the time.  So
have_higher_than_11mbit needs to be initialized to false.

Fixes: 5d6a1b069b7f ("mac80211: set basic rates earlier")
Signed-off-by: Tom Rix 
Reviewed-by: Nick Desaulniers 
Link: https://lore.kernel.org/r/20211223162848.3243702-1-trix@redhat.com
Signed-off-by: Johannes Berg 
Signed-off-by: Greg Kroah-Hartman