netdev - [PATCH] wifi: ath6kl: Check that the read operation returns a data length of 0

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Message-ID: <tencent_8D19734F828DA6A5938DF1122F5DDC5DBC07@qq.com>
Date: Sun, 25 Aug 2024 15:10:03 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+92c6dd14aaa230be6855@...kaller.appspotmail.com
Cc: kvalo@...nel.org,
	linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org,
	linux-wireless@...r.kernel.org,
	netdev@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: [PATCH] wifi: ath6kl: Check that the read operation returns a data length of 0

If the data length returned by the device is 0, the read operation
should be considered a failure.

Reported-and-tested-by: syzbot+92c6dd14aaa230be6855@...kaller.appspotmail.com
Signed-off-by: Edward Adam Davis <eadavis@...com>
---
 drivers/net/wireless/ath/ath6kl/usb.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/wireless/ath/ath6kl/usb.c b/drivers/net/wireless/ath/ath6kl/usb.c
index 5220809841a6..2a89bab81b24 100644
--- a/drivers/net/wireless/ath/ath6kl/usb.c
+++ b/drivers/net/wireless/ath/ath6kl/usb.c
@@ -1034,6 +1034,9 @@ static int ath6kl_usb_bmi_read(struct ath6kl *ar, u8 *buf, u32 len)
 		ath6kl_err("Unable to read the bmi data from the device: %d\n",
 			   ret);
 		return ret;
+	} else {
+		ath6kl_err("Actual read the bmi data length is 0 from the device\n");
+		return -EIO;
 	}
 
 	return 0;
-- 
2.43.0