6.5-stable review patch. If anyone has any objections, please let me know.
------------------
From: Johan Hovold <johan+linaro@xxxxxxxxxx>
commit 3f77c7d605b29df277d77e9ee75d96e7ad145d2d upstream.
The ath11k active pdevs are protected by RCU but the htt pktlog 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
Signed-off-by: Johan Hovold <johan+linaro@xxxxxxxxxx>
Signed-off-by: Kalle Valo <quic_kvalo@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20231019112521.2071-1-johan+linaro@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/wireless/ath/ath11k/dp_rx.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
--- a/drivers/net/wireless/ath/ath11k/dp_rx.c
+++ b/drivers/net/wireless/ath/ath11k/dp_rx.c
@@ -1621,14 +1621,20 @@ static void ath11k_htt_pktlog(struct ath
u8 pdev_id;
pdev_id = FIELD_GET(HTT_T2H_PPDU_STATS_INFO_PDEV_ID, data->hdr);
+
+ rcu_read_lock();
+
ar = ath11k_mac_get_ar_by_pdev_id(ab, pdev_id);
if (!ar) {
ath11k_warn(ab, "invalid pdev id %d on htt pktlog\n", pdev_id);
- return;
+ goto out;
}
trace_ath11k_htt_pktlog(ar, data->payload, hdr->size,
ar->ab->pktlog_defs_checksum);
+
+out:
+ rcu_read_unlock();
}
static void ath11k_htt_backpressure_event_handler(struct ath11k_base *ab,
