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

[Edward Adam Davis]

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

Reported-and-tested-by: syzbot+92c6dd14aaa230be6855@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Edward Adam Davis <eadavis@xxxxxx>
---
 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