linux-kernel - [ 076/122] tg3: Fix race condition in tg3_get

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Date:	Tue,  7 Aug 2012 15:26:04 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Michael Chan <mchan@...adcom.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 076/122] tg3: Fix race condition in tg3_get_stats64()

From: Greg KH <gregkh@...uxfoundation.org>

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

------------------

From: Michael Chan <mchan@...adcom.com>

commit 0f566b208b41918053b2e67399673aaec02dde5d upstream.

Spinlock should be taken before checking for tp->hw_stats.

Signed-off-by: Michael Chan <mchan@...adcom.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/ethernet/broadcom/tg3.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -12282,10 +12282,12 @@ static struct rtnl_link_stats64 *tg3_get
 {
 	struct tg3 *tp = netdev_priv(dev);
 
-	if (!tp->hw_stats)
+	spin_lock_bh(&tp->lock);
+	if (!tp->hw_stats) {
+		spin_unlock_bh(&tp->lock);
 		return &tp->net_stats_prev;
+	}
 
-	spin_lock_bh(&tp->lock);
 	tg3_get_nstats(tp, stats);
 	spin_unlock_bh(&tp->lock);
 


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