From: Johan Hovold <johan+linaro@kernel.org> stable inclusion from stable-v6.6.3 commit afd3425bd69610f318403084fe491e24a1357fb9 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I8LBQP Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- 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> Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com> --- drivers/net/wireless/ath/ath12k/dp_rx.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/ath/ath12k/dp_rx.c b/drivers/net/wireless/ath/ath12k/dp_rx.c index e1c84fc97460..dbcbe7e0cd2a 100644 --- 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_handler(struct ath12k_base *ab, 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_handler(struct ath12k_base *ab, 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, -- 2.25.1