linux-kernel - Re: [syzbot] [wireless?] KMSAN: uninit-value in ath9k_hw

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Date:   Mon, 13 Mar 2023 17:36:19 +0300
From:   Fedor Pchelkin <pchelkin@...ras.ru>
To:     syzbot+df61b36319e045c00a08@...kaller.appspotmail.com
Cc:     syzkaller-bugs@...glegroups.com, linux-kernel@...r.kernel.org
Subject: Re: [syzbot] [wireless?] KMSAN: uninit-value in ath9k_hw_init

#syz test: https://github.com/google/kmsan.git master

--- a/drivers/net/wireless/ath/ath9k/htc_drv_init.c
+++ b/drivers/net/wireless/ath/ath9k/htc_drv_init.c
@@ -243,7 +243,7 @@ static unsigned int ath9k_regread(void *hw_priv, u32 reg_offset)
 			  (u8 *) &reg, sizeof(reg),
 			  (u8 *) &val, sizeof(val),
 			  100);
-	if (unlikely(r)) {
+	if (r) {
 		ath_dbg(common, WMI, "REGISTER READ FAILED: (0x%04x, %d)\n",
 			reg_offset, r);
 		return -1;
@@ -259,7 +259,7 @@ static void ath9k_multi_regread(void *hw_priv, u32 *addr,
 	struct ath_common *common = ath9k_hw_common(ah);
 	struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *) common->priv;
 	__be32 tmpaddr[8];
-	__be32 tmpval[8];
+	__be32 tmpval[8] = {0};
 	int i, ret;
 
 	for (i = 0; i < count; i++) {
@@ -270,7 +270,7 @@ static void ath9k_multi_regread(void *hw_priv, u32 *addr,
 			   (u8 *)tmpaddr , sizeof(u32) * count,
 			   (u8 *)tmpval, sizeof(u32) * count,
 			   100);
-	if (unlikely(ret)) {
+	if (ret) {
 		ath_dbg(common, WMI,
 			"Multiple REGISTER READ FAILED (count: %d)\n", count);
 	}
--- a/drivers/net/wireless/ath/ath9k/wmi.c
+++ b/drivers/net/wireless/ath/ath9k/wmi.c
@@ -204,6 +204,9 @@ static void ath9k_wmi_rsp_callback(struct wmi *wmi, struct sk_buff *skb)
 {
 	skb_pull(skb, sizeof(struct wmi_cmd_hdr));
 
+	if (unlikely(skb->len < wmi->cmd_rsp_len))
+		return;
+
 	if (wmi->cmd_rsp_buf != NULL && wmi->cmd_rsp_len != 0)
 		memcpy(wmi->cmd_rsp_buf, skb->data, wmi->cmd_rsp_len);
 
@@ -221,6 +224,9 @@ static void ath9k_wmi_ctrl_rx(void *priv, struct sk_buff *skb,
 	if (unlikely(wmi->stopped))
 		goto free_skb;
 
+	if (unlikely(skb->len < sizeof(struct wmi_cmd_hdr)))
+		goto free_skb;
+
 	hdr = (struct wmi_cmd_hdr *) skb->data;
 	cmd_id = be16_to_cpu(hdr->command_id);
 
@@ -308,8 +314,11 @@ int ath9k_wmi_cmd(struct wmi *wmi, enum wmi_cmd_id cmd_id,
 	unsigned long time_left;
 	int ret = 0;
 
-	if (ah->ah_flags & AH_UNPLUGGED)
-		return 0;
+	if (ah->ah_flags & AH_UNPLUGGED) {
+		ath_dbg(common, WMI, "Device unplugged for WMI command: %s\n",
+			wmi_cmd_to_name(cmd_id));
+		return -ENODEV;
+	}
 
 	skb = alloc_skb(headroom + cmd_len, GFP_ATOMIC);
 	if (!skb)
--