linux-kernel - [104/107] xfrm: Fix off by one in the replay advance functions

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Message-Id: <20110708001702.832763639@clark.kroah.org>
Date:	Thu, 07 Jul 2011 17:17:16 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Steffen Klassert <steffen.klassert@...unet.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [104/107] xfrm: Fix off by one in the replay advance functions

2.6.39-stable review patch.  If anyone has any objections, please let us know.

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


From: Steffen Klassert <steffen.klassert@...unet.com>

[ Upstream commit e756682c8baa47da1648c0c016e9f48ed66bc32d ]

We may write 4 byte too much when we reinitialize the anti replay
window in the replay advance functions. This patch fixes this by
adjusting the last index of the initialization loop.

Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 net/xfrm/xfrm_replay.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/net/xfrm/xfrm_replay.c
+++ b/net/xfrm/xfrm_replay.c
@@ -265,7 +265,7 @@ static void xfrm_replay_advance_bmp(stru
 			bitnr = bitnr & 0x1F;
 			replay_esn->bmp[nr] |= (1U << bitnr);
 		} else {
-			nr = replay_esn->replay_window >> 5;
+			nr = (replay_esn->replay_window - 1) >> 5;
 			for (i = 0; i <= nr; i++)
 				replay_esn->bmp[i] = 0;
 
@@ -471,7 +471,7 @@ static void xfrm_replay_advance_esn(stru
 			bitnr = bitnr & 0x1F;
 			replay_esn->bmp[nr] |= (1U << bitnr);
 		} else {
-			nr = replay_esn->replay_window >> 5;
+			nr = (replay_esn->replay_window - 1) >> 5;
 			for (i = 0; i <= nr; i++)
 				replay_esn->bmp[i] = 0;
 


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