linux-kernel - [PATCH v2] rtlwifi: fix memory leak for USB device

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Message-Id: <1449446851-2221-1-git-send-email-peter@lekensteyn.nl>
Date:	Mon,  7 Dec 2015 01:07:31 +0100
From:	Peter Wu <peter@...ensteyn.nl>
To:	Larry Finger <Larry.Finger@...inger.net>,
	Chaoming Li <chaoming_li@...lsil.com.cn>,
	Kalle Valo <kvalo@...eaurora.org>,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc:	stable@...r.kernel.org
Subject: [PATCH v2] rtlwifi: fix memory leak for USB device

Free skb for received frames with a wrong checksum. This can happen
pretty rapidly, exhausting all memory.

This fixes a memleak (detected with kmemleak). Originally found while
using monitor mode, but it also appears during managed mode (once the
link is up).

Cc: stable@...r.kernel.org
Signed-off-by: Peter Wu <peter@...ensteyn.nl>
---
 v2: updated commit message based on Larry's feedback
 v1: https://lkml.kernel.org/r/1449424677-3140-1-git-send-email-peter@lekensteyn.nl

Tested with v4.3, rebased on v4.4-rc3 (changed paths). The bug goes back
to its introduction in the v2.6.x kernel.
---
 drivers/net/wireless/realtek/rtlwifi/usb.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/wireless/realtek/rtlwifi/usb.c b/drivers/net/wireless/realtek/rtlwifi/usb.c
index 2721cf8..aac1ed3 100644
--- a/drivers/net/wireless/realtek/rtlwifi/usb.c
+++ b/drivers/net/wireless/realtek/rtlwifi/usb.c
@@ -531,6 +531,8 @@ static void _rtl_usb_rx_process_noagg(struct ieee80211_hw *hw,
 			ieee80211_rx(hw, skb);
 		else
 			dev_kfree_skb_any(skb);
+	} else {
+		dev_kfree_skb_any(skb);
 	}
 }
 
-- 
2.6.3

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