CVE-2025-38606: wifi: ath12k: Avoid accessing uninitialized arvif->ar during beacon miss

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

wifi: ath12k: Avoid accessing uninitialized arvif->ar during beacon miss

During beacon miss handling, ath12k driver iterates over active virtual interfaces (vifs) and attempts to access the radio object (ar) via arvif->deflink->ar.

However, after commit aa80f12f3bed ("wifi: ath12k: defer vdev creation for MLO"), arvif is linked to a radio only after vdev creation, typically when a channel is assigned or a scan is requested. For P2P capable devices, a default P2P interface is created by wpasupplicant along with regular station interfaces, these serve as dummy interfaces for P2P-capable stations, lack an associated netdev and initiate frequent scans to discover neighbor p2p devices. When a scan is initiated on such P2P vifs, driver selects destination radio (ar) based on scan frequency, creates a scan vdev, and attaches arvif to the radio. Once the scan completes or is aborted, the scan vdev is deleted, detaching arvif from the radio and leaving arvif->ar uninitialized.

While handling beacon miss for station interfaces, P2P interface is also encountered in the vif iteration and ath12kmachandlebeaconmissiter() tries to dereference the uninitialized arvif->deflink->ar.

Fix this by verifying that vdev is created for the arvif before accessing its ar during beacon miss handling and similar vif iterator callbacks.

========================================================================== wlp6s0: detected beacon loss from AP (missed 7 beacons) - probing KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]

CPU: 5 UID: 0 PID: 0 Comm: swapper/5 Not tainted 6.16.0-rc1-wt-ath+ #2 PREEMPT(full) RIP: 0010:ath12kmachandlebeaconmissiter+0xb5/0x1a0 [ath12k] Call Trace: iterateinterfaces+0x11a/0x410 [mac80211] ieee80211iterateactiveinterfacesatomic+0x61/0x140 [mac80211] ath12kmachandlebeaconmiss+0xa1/0xf0 [ath12k] ath12kroamevent+0x393/0x560 [ath12k] ath12kwmioprx+0x1486/0x28c0 [ath12k] ath12khtcprocesstrailer.isra.0+0x2fb/0x620 [ath12k] ath12khtcrxcompletionhandler+0x448/0x830 [ath12k] ath12kcerecvprocesscb+0x549/0x9e0 [ath12k] ath12kceperengineservice+0xbe/0xf0 [ath12k] ath12kpciceworkqueue+0x69/0x120 [ath12k] processonework+0xe3a/0x1430

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.4.1-00199-QCAHKSWPLSILICONZ-1 Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.1.c5-00284.1-QCAHMTSWPLV1.0V2.0SILICONZ-3