CVE-2024-47724

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

wifi: ath11k: use work queue to process beacon tx event

Commit 3a415daa3e8b (wifi: ath11k: add P2P IE in beacon template) from Feb 28, 2024 (linux-next), leads to the following Smatch static checker warning:

drivers/net/wireless/ath/ath11k/wmi.c:1742 ath11k_wmi_p2p_go_bcn_ie() warn: sleeping in atomic context

The reason is that ath11k_bcn_tx_status_event() will directly call might sleep function ath11k_wmi_cmd_send() during RCU read-side critical sections. The call trace is like:

ath11k_bcn_tx_status_event() -> rcu_read_lock() -> ath11k_mac_bcn_tx_event() -> ath11k_mac_setup_bcn_tmpl() …… -> ath11k_wmi_bcn_tmpl() -> ath11k_wmi_cmd_send() -> rcu_read_unlock()

Commit 886433a98425 (ath11k: add support for BSS color change) added the ath11k_mac_bcn_tx_event(), commit 01e782c89108 (ath11k: fix warning of RCU usage for ath11k_mac_get_arvif_by_vdev_id()) added the RCU lock to avoid warning but also introduced this BUG.

Use work queue to avoid directly calling ath11k_mac_bcn_tx_event() during RCU critical sections. No need to worry about the deletion of vif because cancel_work_sync() will drop the work if it doesnt start or block vif deletion until the running work is done.

Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.30

Affected Software

References

• https://git.kernel.org/stable/c/177b49dbf9c1d8f9f25a22ffafa416fc2c8aa6a3
• https://git.kernel.org/stable/c/6db232905e094e64abff1f18249905d068285e09
• https://git.kernel.org/stable/c/dbd51da69dda1137723b8f66460bf99a9dac8dd2