linux-kernel - [PATCH 3.16.y-ckt 146/180] ath9k_htc: check for underflow in ath9k_htc_rx

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Message-Id: <1454538786-12215-147-git-send-email-luis.henriques@canonical.com>
Date:	Wed,  3 Feb 2016 22:32:32 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Dan Carpenter <dan.carpenter@...cle.com>,
	Kalle Valo <kvalo@...eaurora.org>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 146/180] ath9k_htc: check for underflow in ath9k_htc_rx_msg()

3.16.7-ckt24 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Dan Carpenter <dan.carpenter@...cle.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.carpenter@...cle.com>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/net/wireless/ath/ath9k/htc_hst.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath9k/htc_hst.c b/drivers/net/wireless/ath/ath9k/htc_hst.c
index a0ff5b637054..93a86e24ff30 100644
--- a/drivers/net/wireless/ath/ath9k/htc_hst.c
+++ b/drivers/net/wireless/ath/ath9k/htc_hst.c
@@ -415,7 +415,7 @@ 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