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

Fedor Pchelkin
2023-03-13T17:41:28Z

#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
@@ -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++) {
--- a/drivers/net/wireless/ath/ath9k/wmi.c
+++ b/drivers/net/wireless/ath/ath9k/wmi.c
@@ -204,8 +204,13 @@ 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);
+ else
+ return;

complete(&wmi->cmd_wait);
}
@@ -221,6 +226,9 @@ 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 +316,11 @@ 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)
@@ -342,15 +353,22 @@ int ath9k_wmi_cmd(struct wmi *wmi, enum wmi_cmd_id cmd_id,
ath_dbg(common, WMI, "Timeout waiting for WMI command: %s\n",
wmi_cmd_to_name(cmd_id));
wmi->last_seq_id = 0;
+ wmi->cmd_rsp_buf = NULL;
+ wmi->cmd_rsp_len = 0;
mutex_unlock(&wmi->op_mutex);
return -ETIMEDOUT;
}

+ wmi->cmd_rsp_buf = NULL;
+ wmi->cmd_rsp_len = 0;
+
mutex_unlock(&wmi->op_mutex);

return 0;

out:
+ wmi->cmd_rsp_buf = NULL;
+ wmi->cmd_rsp_len = 0;
ath_dbg(common, WMI, "WMI failure for: %s\n", wmi_cmd_to_name(cmd_id));
mutex_unlock(&wmi->op_mutex);
kfree_skb(skb);
--