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wifi: ath11k: fix dfs radar event locking
The ath11k active pdevs are protected by RCU but the DFS radar event
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: d5c65159f2
("ath11k: driver for Qualcomm IEEE 802.11ax devices")
Cc: stable@vger.kernel.org # 5.6
Acked-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20231019153115.26401-3-johan+linaro@kernel.org
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1 changed files with 4 additions and 0 deletions
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@ -8336,6 +8336,8 @@ ath11k_wmi_pdev_dfs_radar_detected_event(struct ath11k_base *ab, struct sk_buff
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ev->detector_id, ev->segment_id, ev->timestamp, ev->is_chirp,
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ev->freq_offset, ev->sidx);
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rcu_read_lock();
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ar = ath11k_mac_get_ar_by_pdev_id(ab, ev->pdev_id);
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if (!ar) {
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@ -8353,6 +8355,8 @@ ath11k_wmi_pdev_dfs_radar_detected_event(struct ath11k_base *ab, struct sk_buff
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ieee80211_radar_detected(ar->hw);
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exit:
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rcu_read_unlock();
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kfree(tb);
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}
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