6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Johan Hovold johan+linaro@kernel.org
commit 3b6c14833165f689cc5928574ebafe52bbce5f1e upstream.
The ath11k active pdevs are protected by RCU but the DFS radar event handling code calling ath11k_mac_get_ar_by_pdev_id() was not marked as a read-side critical section.
Mark the code in question as an RCU read-side critical section to avoid any potential use-after-free issues.
Compile tested only.
Fixes: d5c65159f289 ("ath11k: driver for Qualcomm IEEE 802.11ax devices") Cc: stable@vger.kernel.org # 5.6 Acked-by: Jeff Johnson quic_jjohnson@quicinc.com Signed-off-by: Johan Hovold johan+linaro@kernel.org Signed-off-by: Kalle Valo quic_kvalo@quicinc.com Link: https://lore.kernel.org/r/20231019153115.26401-3-johan+linaro@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/wireless/ath/ath11k/wmi.c | 4 ++++ 1 file changed, 4 insertions(+)
--- a/drivers/net/wireless/ath/ath11k/wmi.c +++ b/drivers/net/wireless/ath/ath11k/wmi.c @@ -8337,6 +8337,8 @@ ath11k_wmi_pdev_dfs_radar_detected_event ev->detector_id, ev->segment_id, ev->timestamp, ev->is_chirp, ev->freq_offset, ev->sidx);
+ rcu_read_lock(); + ar = ath11k_mac_get_ar_by_pdev_id(ab, ev->pdev_id);
if (!ar) { @@ -8354,6 +8356,8 @@ ath11k_wmi_pdev_dfs_radar_detected_event ieee80211_radar_detected(ar->hw);
exit: + rcu_read_unlock(); + kfree(tb); }