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 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@vger.kernel.org # 5.6 Signed-off-by: Johan Hovold johan+linaro@kernel.org Signed-off-by: Kalle Valo quic_kvalo@quicinc.com Link: https://lore.kernel.org/r/20231019112521.2071-1-johan+linaro@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- 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,