From 2f5124e86ae74b7ba24c9ae2644107b750cbf38f Mon Sep 17 00:00:00 2001 From: Wen Gong Date: Wed, 9 Aug 2023 04:16:57 -0400 Subject: [PATCH] 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 Reviewed-by: Jeff Johnson Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/20230809081657.13858-1-quic_wgong@quicinc.com --- drivers/net/wireless/ath/ath12k/wmi.c | 20 +++++++++++++------- 1 file changed, 13 insertions(+), 7 deletions(-) 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); -- 2.30.2