This is a note to let you know that I've just added the patch titled
wifi: ath11k: fix dfs radar event locking
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
wifi-ath11k-fix-dfs-radar-event-locking.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 3b6c14833165f689cc5928574ebafe52bbce5f1e Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan+linaro@xxxxxxxxxx>
Date: Thu, 19 Oct 2023 17:31:15 +0200
Subject: wifi: ath11k: fix dfs radar event locking
From: Johan Hovold <johan+linaro@xxxxxxxxxx>
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@xxxxxxxxxxxxxxx # 5.6
Acked-by: Jeff Johnson <quic_jjohnson@xxxxxxxxxxx>
Signed-off-by: Johan Hovold <johan+linaro@xxxxxxxxxx>
Signed-off-by: Kalle Valo <quic_kvalo@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20231019153115.26401-3-johan+linaro@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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
@@ -6809,6 +6809,8 @@ 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) {
@@ -6826,6 +6828,8 @@ ath11k_wmi_pdev_dfs_radar_detected_event
ieee80211_radar_detected(ar->hw);
exit:
+ rcu_read_unlock();
+
kfree(tb);
}
Patches currently in stable-queue which might be from johan+linaro@xxxxxxxxxx are
queue-5.15/wifi-ath11k-fix-dfs-radar-event-locking.patch
queue-5.15/wifi-ath11k-fix-htt-pktlog-locking.patch
queue-5.15/wifi-ath11k-fix-temperature-event-locking.patch
