From: Wen Gong <quic_wgong@quicinc.com>
Date: Wed, 9 Aug 2023 08:16:57 +0000 (-0400)
Subject: wifi: ath12k: add check max message length while scanning with extraie
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=2f5124e86ae74b7ba24c9ae2644107b750cbf38f;p=linux.git

wifi: ath12k: add check max message length while scanning with extraie

Currently the extraie length is directly used to allocate skb buffer. When
the length of skb is greater than the max message length which firmware
supports, error will happen in firmware side.

Hence add check for the skb length and drop extraie when overflow and
print a message.

Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0-03427-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.15378.4

Signed-off-by: Wen Gong <quic_wgong@quicinc.com>
Reviewed-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20230809081657.13858-1-quic_wgong@quicinc.com
---

diff --git a/drivers/net/wireless/ath/ath12k/wmi.c b/drivers/net/wireless/ath/ath12k/wmi.c
index cc9a377c06fd0..ef0f3cf35cfd1 100644
--- a/drivers/net/wireless/ath/ath12k/wmi.c
+++ b/drivers/net/wireless/ath/ath12k/wmi.c
@@ -2239,12 +2239,6 @@ int ath12k_wmi_send_scan_start_cmd(struct ath12k *ar,
 	if (arg->num_bssid)
 		len += sizeof(*bssid) * arg->num_bssid;
 
-	len += TLV_HDR_SIZE;
-	if (arg->extraie.len)
-		extraie_len_with_pad =
-			roundup(arg->extraie.len, sizeof(u32));
-	len += extraie_len_with_pad;
-
 	if (arg->num_hint_bssid)
 		len += TLV_HDR_SIZE +
 		       arg->num_hint_bssid * sizeof(*hint_bssid);
@@ -2253,6 +2247,18 @@ int ath12k_wmi_send_scan_start_cmd(struct ath12k *ar,
 		len += TLV_HDR_SIZE +
 		       arg->num_hint_s_ssid * sizeof(*s_ssid);
 
+	len += TLV_HDR_SIZE;
+	if (arg->extraie.len)
+		extraie_len_with_pad =
+			roundup(arg->extraie.len, sizeof(u32));
+	if (extraie_len_with_pad <= (wmi->wmi_ab->max_msg_len[ar->pdev_idx] - len)) {
+		len += extraie_len_with_pad;
+	} else {
+		ath12k_warn(ar->ab, "discard large size %d bytes extraie for scan start\n",
+			    arg->extraie.len);
+		extraie_len_with_pad = 0;
+	}
+
 	skb = ath12k_wmi_alloc_skb(wmi->wmi_ab, len);
 	if (!skb)
 		return -ENOMEM;
@@ -2342,7 +2348,7 @@ int ath12k_wmi_send_scan_start_cmd(struct ath12k *ar,
 	tlv->header = ath12k_wmi_tlv_hdr(WMI_TAG_ARRAY_BYTE, len);
 	ptr += TLV_HDR_SIZE;
 
-	if (arg->extraie.len)
+	if (extraie_len_with_pad)
 		memcpy(ptr, arg->extraie.ptr,
 		       arg->extraie.len);