CVE-2024-47713

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

wifi: mac80211: use two-phase skb reclamation in ieee80211dostop()

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

ieee80211dostop() ... spinlockirqsave(&local->queuestopreasonlock, flags) ... ieee80211freetxskb() ieee80211reportusedskb() ieee80211reportackskb() cfg80211mgmttxstatusext() nl80211frametxstatus() genlmsgmulticastnetns() genlmsgmulticastnetnsfiltered() nlmsgmulticastfiltered() netlinkbroadcastfiltered() doonebroadcast() netlinkbroadcastdeliver() _netlinksendskb() netlinkdelivertap() _netlinkdelivertapskb() devqueuexmit() _devqueuexmit() ; with IRQS disabled ... spinunlockirqrestore(&local->queuestopreason_lock, flags)

issues the warning (as reported by syzbot reproducer):

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

Fix this by implementing a two-phase skb reclamation in 'ieee80211dostop()', where actual work is performed outside of a section with interrupts disabled.