linux-kernel - Re: [syzbot] [wireless?] KMSAN: uninit-value in ath9k_wmi_ctrl

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Date:   Mon, 13 Mar 2023 13:28:07 +0300
From:   Fedor Pchelkin <pchelkin@...ras.ru>
To:     syzbot+f2cb6e0ffdb961921e4d@...kaller.appspotmail.com
Cc:     syzkaller-bugs@...glegroups.com, linux-kernel@...r.kernel.org
Subject: Re: [syzbot] [wireless?] KMSAN: uninit-value in ath9k_wmi_ctrl_rx

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

--- a/drivers/net/wireless/ath/ath9k/wmi.c
+++ b/drivers/net/wireless/ath/ath9k/wmi.c
@@ -221,6 +221,9 @@ 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);
 
--