Patch "tcp: Fix integer-overflow in TCP vegas" has been added to the 3.10-stable tree

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This is a note to let you know that I've just added the patch titled

    tcp: Fix integer-overflow in TCP vegas

to the 3.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     tcp-fix-integer-overflow-in-tcp-vegas.patch
and it can be found in the queue-3.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From foo@baz Fri Aug  8 08:48:58 PDT 2014
From: Christoph Paasch <christoph.paasch@xxxxxxxxxxxx>
Date: Tue, 29 Jul 2014 13:40:57 +0200
Subject: tcp: Fix integer-overflow in TCP vegas

From: Christoph Paasch <christoph.paasch@xxxxxxxxxxxx>

[ Upstream commit 1f74e613ded11517db90b2bd57e9464d9e0fb161 ]

In vegas we do a multiplication of the cwnd and the rtt. This
may overflow and thus their result is stored in a u64. However, we first
need to cast the cwnd so that actually 64-bit arithmetic is done.

Then, we need to do do_div to allow this to be used on 32-bit arches.

Cc: Stephen Hemminger <stephen@xxxxxxxxxxxxxxxxxx>
Cc: Neal Cardwell <ncardwell@xxxxxxxxxx>
Cc: Eric Dumazet <eric.dumazet@xxxxxxxxx>
Cc: David Laight <David.Laight@xxxxxxxxxx>
Cc: Doug Leith <doug.leith@xxxxxxx>
Fixes: 8d3a564da34e (tcp: tcp_vegas cong avoid fix)
Signed-off-by: Christoph Paasch <christoph.paasch@xxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/ipv4/tcp_vegas.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/net/ipv4/tcp_vegas.c
+++ b/net/ipv4/tcp_vegas.c
@@ -218,7 +218,8 @@ static void tcp_vegas_cong_avoid(struct
 			 * This is:
 			 *     (actual rate in segments) * baseRTT
 			 */
-			target_cwnd = tp->snd_cwnd * vegas->baseRTT / rtt;
+			target_cwnd = (u64)tp->snd_cwnd * vegas->baseRTT;
+			do_div(target_cwnd, rtt);
 
 			/* Calculate the difference between the window we had,
 			 * and the window we would like to have. This quantity


Patches currently in stable-queue which might be from christoph.paasch@xxxxxxxxxxxx are

queue-3.10/tcp-fix-integer-overflow-in-tcp-vegas.patch
queue-3.10/tcp-fix-integer-overflows-in-tcp-veno.patch
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