linux-kernel - [PATCH] [84/106] p54: Initialize extra_len in p54_tx

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Message-Id: <20110426211406.21A4C3E1886@tassilo.jf.intel.com>
Date:	Tue, 26 Apr 2011 14:14:06 -0700 (PDT)
From:	Andi Kleen <andi@...stfloor.org>
To:	jason.conti@...il.com, chunkeey@...glemail.com,
	linville@...driver.com, gregkh@...e.de, ak@...ux.intel.com,
	linux-kernel@...r.kernel.org, stable@...nel.org,
	tim.bird@...sony.com
Subject: [PATCH] [84/106] p54: Initialize extra_len in p54_tx_80211

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: Jason Conti <jason.conti@...il.com>

commit a6756da9eace8b4af73e9dea43f1fc2889224c94 upstream.

This patch fixes a very serious off-by-one bug in
the driver, which could leave the device in an
unresponsive state.

The problem was that the extra_len variable [used to
reserve extra scratch buffer space for the firmware]
was left uninitialized. Because p54_assign_address
later needs the value to reserve additional space,
the resulting frame could be to big for the small
device's memory window and everything would
immediately come to a grinding halt.

Reference: https://bugs.launchpad.net/bugs/722185

Acked-by: Christian Lamparter <chunkeey@...glemail.com>
Signed-off-by: Jason Conti <jason.conti@...il.com>
Signed-off-by: John W. Linville <linville@...driver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 drivers/net/wireless/p54/txrx.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6.35.y/drivers/net/wireless/p54/txrx.c
===================================================================
--- linux-2.6.35.y.orig/drivers/net/wireless/p54/txrx.c
+++ linux-2.6.35.y/drivers/net/wireless/p54/txrx.c
@@ -702,7 +702,7 @@ int p54_tx_80211(struct ieee80211_hw *de
 	struct p54_tx_info *p54info;
 	struct p54_hdr *hdr;
 	struct p54_tx_data *txhdr;
-	unsigned int padding, len, extra_len;
+	unsigned int padding, len, extra_len = 0;
 	int i, j, ridx;
 	u16 hdr_flags = 0, aid = 0;
 	u8 rate, queue = 0, crypt_offset = 0;
--
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