6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Johan Hovold johan+linaro@kernel.org
commit 6afc57ea315e0f660b1f870a681737bb7b71faef upstream.
The ath12k active pdevs are protected by RCU but the htt mlo-offset 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 an RCU read-side critical section to avoid any potential use-after-free issues.
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/20231019113650.9060-3-johan+linaro@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/wireless/ath/ath12k/dp_rx.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
--- a/drivers/net/wireless/ath/ath12k/dp_rx.c +++ b/drivers/net/wireless/ath/ath12k/dp_rx.c @@ -1658,11 +1658,12 @@ static void ath12k_htt_mlo_offset_event_ msg = (struct ath12k_htt_mlo_offset_msg *)skb->data; pdev_id = u32_get_bits(__le32_to_cpu(msg->info), HTT_T2H_MLO_OFFSET_INFO_PDEV_ID); - ar = ath12k_mac_get_ar_by_pdev_id(ab, pdev_id);
+ rcu_read_lock(); + ar = ath12k_mac_get_ar_by_pdev_id(ab, pdev_id); if (!ar) { ath12k_warn(ab, "invalid pdev id %d on htt mlo offset\n", pdev_id); - return; + goto exit; }
spin_lock_bh(&ar->data_lock); @@ -1678,6 +1679,8 @@ static void ath12k_htt_mlo_offset_event_ pdev->timestamp.mlo_comp_timer = __le32_to_cpu(msg->mlo_comp_timer);
spin_unlock_bh(&ar->data_lock); +exit: + rcu_read_unlock(); }
void ath12k_dp_htt_htc_t2h_msg_handler(struct ath12k_base *ab,