6.6-stable review patch. If anyone has any objections, please let me know.
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From: Johan Hovold johan+linaro@kernel.org
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@vger.kernel.org # v6.2 Signed-off-by: Johan Hovold johan+linaro@kernel.org Acked-by: Jeff Johnson quic_jjohnson@quicinc.com Signed-off-by: Kalle Valo quic_kvalo@quicinc.com Link: https://lore.kernel.org/r/20231019113650.9060-2-johan+linaro@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- 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 @@ -6482,6 +6482,8 @@ 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) { @@ -6499,6 +6501,8 @@ ath12k_wmi_pdev_dfs_radar_detected_event ieee80211_radar_detected(ar->hw);
exit: + rcu_read_unlock(); + kfree(tb); }
@@ -6517,11 +6521,16 @@ 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,