6.5-stable review patch. If anyone has any objections, please let me know.
------------------
From: Johan Hovold <johan+linaro@xxxxxxxxxx>
commit 69bd216e049349886405b1c87a55dce3d35d1ba7 upstream.
The ath12k active pdevs are protected by RCU but the DFS-radar and
temperature event handling code calling ath12k_mac_get_ar_by_pdev_id()
was not marked as a read-side critical section.
Mark the code in question as RCU read-side critical sections to avoid
any potential use-after-free issues.
Note that the temperature event handler looks like a place holder
currently but would still trigger an RCU lockdep splat.
Compile tested only.
Fixes: d889913205cf ("wifi: ath12k: driver for Qualcomm Wi-Fi 7 devices")
Cc: stable@xxxxxxxxxxxxxxx # v6.2
Signed-off-by: Johan Hovold <johan+linaro@xxxxxxxxxx>
Acked-by: Jeff Johnson <quic_jjohnson@xxxxxxxxxxx>
Signed-off-by: Kalle Valo <quic_kvalo@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20231019113650.9060-2-johan+linaro@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/wireless/ath/ath12k/wmi.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
--- a/drivers/net/wireless/ath/ath12k/wmi.c
+++ b/drivers/net/wireless/ath/ath12k/wmi.c
@@ -6234,6 +6234,8 @@ ath12k_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 = ath12k_mac_get_ar_by_pdev_id(ab, le32_to_cpu(ev->pdev_id));
if (!ar) {
@@ -6251,6 +6253,8 @@ ath12k_wmi_pdev_dfs_radar_detected_event
ieee80211_radar_detected(ar->hw);
exit:
+ rcu_read_unlock();
+
kfree(tb);
}
@@ -6269,11 +6273,16 @@ ath12k_wmi_pdev_temperature_event(struct
ath12k_dbg(ab, ATH12K_DBG_WMI,
"pdev temperature ev temp %d pdev_id %d\n", ev.temp, ev.pdev_id);
+ rcu_read_lock();
+
ar = ath12k_mac_get_ar_by_pdev_id(ab, le32_to_cpu(ev.pdev_id));
if (!ar) {
ath12k_warn(ab, "invalid pdev id in pdev temperature ev %d", ev.pdev_id);
- return;
+ goto exit;
}
+
+exit:
+ rcu_read_unlock();
}
static void ath12k_fils_discovery_event(struct ath12k_base *ab,
