Re: [syzbot] [wireless?] KMSAN: uninit-value in ath9k_hw_init

Fedor Pchelkin
2023-03-13T11:03:10Z

#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);

@@ -308,8 +311,11 @@ 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)
--