[PATCH 4/4] wifi: ath12k: validate ready event MAC address array length

[Jiale Yao]

From: Jiale Yao <jiale.yao at example.com>

The ready event reports the number of extra MAC addresses separately
from the fixed-structure address array. ath12k checks the reported
count before assigning addresses to radios, but does not check the
length of the array TLV. A truncated array therefore causes reads past
the supplied event data.

Validate the array capacity before copying any addresses.

Fixes: d889913205cf ("wifi: ath12k: driver for Qualcomm Wi-Fi 7 devices")
Signed-off-by: Jiale Yao <jiale.yao at example.com>
---
 drivers/net/wireless/ath/ath12k/wmi.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/wireless/ath/ath12k/wmi.c b/drivers/net/wireless/ath/ath12k/wmi.c
index 66e39672dcda..0ae366e8a944 100644
--- a/drivers/net/wireless/ath/ath12k/wmi.c
+++ b/drivers/net/wireless/ath/ath12k/wmi.c
@@ -7082,6 +7082,9 @@ static int ath12k_wmi_rdy_parse(struct ath12k_base *ab, u16 tag, u16 len,
 		if (!(ab->num_radios > 1 && num_mac_addr >= ab->num_radios))
 			break;
 
+		if (len / sizeof(*addr_list) < ab->num_radios)
+			return -EINVAL;
+
 		for (i = 0; i < ab->num_radios; i++) {
 			pdev = &ab->pdevs[i];
 			ether_addr_copy(pdev->mac_addr, addr_list[i].addr);
-- 
2.34.1