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.

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 ---

Here's one more...

Johan

drivers/net/wireless/ath/ath11k/dp_rx.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath11k/dp_rx.c b/drivers/net/wireless/ath/ath11k/dp_rx.c index 62bc98852f0f..0acbf53ae991 100644 --- a/drivers/net/wireless/ath/ath11k/dp_rx.c +++ b/drivers/net/wireless/ath/ath11k/dp_rx.c @@ -1621,14 +1621,18 @@ static void ath11k_htt_pktlog(struct ath11k_base *ab, struct sk_buff *skb) 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,