[PATCH 4.4 173/312] ath9k_htc: check for underflow in ath9k_htc_rx_msg()

[Greg Kroah-Hartman]

From: Dan Carpenter <dan.carpen...@oracle.com>

commit 3a318426e09a9c9266fe6440842e11238f640a20 upstream.

We check for overflow here, but we don't check for underflow so it
causes a static checker warning.

Fixes: fb9987d0f748 ('ath9k_htc: Support for AR9271 chipset.')
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>
Signed-off-by: Kalle Valo <kv...@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/net/wireless/ath/ath9k/htc_hst.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/wireless/ath/ath9k/htc_hst.c
+++ b/drivers/net/wireless/ath/ath9k/htc_hst.c
@@ -414,7 +414,7 @@ void ath9k_htc_rx_msg(struct htc_target
                return;
        }
 
-       if (epid >= ENDPOINT_MAX) {
+       if (epid < 0 || epid >= ENDPOINT_MAX) {
                if (pipe_id != USB_REG_IN_PIPE)
                        dev_kfree_skb_any(skb);
                else