[PATCH] wifi: ath12k: fix possible out-of-bound write in ath12k_wmi_ext_hal_reg_caps()

[Baochen Qiang]

reg_cap.phy_id is extracted from WMI event and could be an unexpected value
in case some errors happen. As a result out-of-bound write may occur to
soc->hal_reg_cap. Fix it by validating reg_cap.phy_id before using it.

This is found during code review.

Compile tested only.

Signed-off-by: Baochen Qiang <quic_bqiang at quicinc.com>
---
 drivers/net/wireless/ath/ath12k/wmi.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/wireless/ath/ath12k/wmi.c b/drivers/net/wireless/ath/ath12k/wmi.c
index ef0f3cf35cfd..a8a7fa9f71cf 100644
--- a/drivers/net/wireless/ath/ath12k/wmi.c
+++ b/drivers/net/wireless/ath/ath12k/wmi.c
@@ -3876,6 +3876,10 @@ static int ath12k_wmi_ext_hal_reg_caps(struct ath12k_base *soc,
 			ath12k_warn(soc, "failed to extract reg cap %d\n", i);
 			return ret;
 		}
+		if (reg_cap.phy_id >= MAX_RADIOS) {
+			ath12k_warn(soc, "unexpected phy id %u\n", reg_cap.phy_id);
+			return -EINVAL;
+		}
 		soc->hal_reg_cap[reg_cap.phy_id] = reg_cap;
 	}
 	return 0;

base-commit: a62b0aeb556839fb6abb9835874443b08fe95598
-- 
2.25.1