Subject: CVE-2024-47713: wifi: mac80211: use two-phase skb reclamation in ieee80211_do_stop()

From: Greg Kroah-Hartman <[email-masked]>

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

wifi: mac80211: use two-phase skb reclamation in ieee80211_do_stop()

Since '__dev_queue_xmit()' should be called with interrupts enabled,
the following backtrace:

ieee80211_do_stop()
 ...
 spin_lock_irqsave(&local->queue_stop_reason_lock, flags)
 ...
 ieee80211_free_txskb()
  ieee80211_report_used_skb()
   ieee80211_report_ack_skb()
    cfg80211_mgmt_tx_status_ext()
     nl80211_frame_tx_status()
      genlmsg_multicast_netns()
       genlmsg_multicast_netns_filtered()
        nlmsg_multicast_filtered()
	 netlink_broadcast_filtered()
	  do_one_broadcast()
	   netlink_broadcast_deliver()
	    __netlink_sendskb()
	     netlink_deliver_tap()
	      __netlink_deliver_tap_skb()
	       dev_queue_xmit()
	        __dev_queue_xmit() ; with IRQS disabled
 ...
 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags)

issues the warning (as reported by syzbot reproducer):

WARNING: CPU: 2 PID: 5128 at kernel/softirq.c:362 __local_bh_enable_ip+0xc3/0x120

Fix this by implementing a two-phase skb reclamation in
'ieee80211_do_stop()', where actual work is performed
outside of a section with interrupts disabled.

The Linux kernel CVE team has assigned CVE-2024-47713 to this issue.

Affected and fixed versions
===========================

	Issue introduced in 2.6.32 with commit 5061b0c2b906 and fixed in 5.10.227 with commit f232916fab67
	Issue introduced in 2.6.32 with commit 5061b0c2b906 and fixed in 5.15.168 with commit acb53a716e49
	Issue introduced in 2.6.32 with commit 5061b0c2b906 and fixed in 6.1.113 with commit db5ca4b42ccf
	Issue introduced in 2.6.32 with commit 5061b0c2b906 and fixed in 6.6.54 with commit 058c9026ad79
	Issue introduced in 2.6.32 with commit 5061b0c2b906 and fixed in 6.10.13 with commit eab272972cff
	Issue introduced in 2.6.32 with commit 5061b0c2b906 and fixed in 6.11.2 with commit ad4b7068b101
	Issue introduced in 2.6.32 with commit 5061b0c2b906 and fixed in 6.12-rc1 with commit 9d301de12da6

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2024-47713
will be updated if fixes are backported, please check that for the most
up to date information about this issue.

Affected files
==============

The file(s) affected by this issue are:
	net/mac80211/iface.c

Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/f232916fab67ca1c3425926df4a866e59ff26908
	https://git.kernel.org/stable/c/acb53a716e492a02479345157c43f21edc8bc64b
	https://git.kernel.org/stable/c/db5ca4b42ccfa42d2af7b335ff12578e57775c02
	https://git.kernel.org/stable/c/058c9026ad79dc98572442fd4c7e9a36aba6f596
	https://git.kernel.org/stable/c/eab272972cffff9cd973b8e4055a8e81c64f7e6a
	https://git.kernel.org/stable/c/ad4b7068b101fbbb4a9ca4b99b25eb051a9482ec
	https://git.kernel.org/stable/c/9d301de12da6e1bb069a9835c38359b8e8135121