[ath9k-devel] [patch] ath9k_htc: check for underflow in ath9k_htc_rx_msg()

[Dan Carpenter]

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>

diff --git a/drivers/net/wireless/ath/ath9k/htc_hst.c 
b/drivers/net/wireless/ath/ath9k/htc_hst.c
index 2294709..fd85f996 100644
--- 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 *htc_handle,
                return;
        }
 
-       if (epid >= ENDPOINT_MAX) {
+       if (epid < 0 || epid >= ENDPOINT_MAX) {
                if (pipe_id != USB_REG_IN_PIPE)
                        dev_kfree_skb_any(skb);
                else
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