Patch "tcp: Fix integer-overflows in TCP veno" has been added to the 3.4-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-overflows in TCP veno

to the 3.4-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-overflows-in-tcp-veno.patch
and it can be found in the queue-3.4 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 Thu Aug  7 20:47:07 PDT 2014
From: Christoph Paasch <christoph.paasch@xxxxxxxxxxxx>
Date: Tue, 29 Jul 2014 12:07:27 +0200
Subject: tcp: Fix integer-overflows in TCP veno

From: Christoph Paasch <christoph.paasch@xxxxxxxxxxxx>

[ Upstream commit 45a07695bc64b3ab5d6d2215f9677e5b8c05a7d0 ]

In veno 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.

A first attempt at fixing 76f1017757aa0 ([TCP]: TCP Veno congestion
control) was made by 159131149c2 (tcp: Overflow bug in Vegas), but it
failed to add the required cast in tcp_veno_cong_avoid().

Fixes: 76f1017757aa0 ([TCP]: TCP Veno congestion control)
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_veno.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/ipv4/tcp_veno.c
+++ b/net/ipv4/tcp_veno.c
@@ -144,7 +144,7 @@ static void tcp_veno_cong_avoid(struct s
 
 		rtt = veno->minrtt;
 
-		target_cwnd = (tp->snd_cwnd * veno->basertt);
+		target_cwnd = (u64)tp->snd_cwnd * veno->basertt;
 		target_cwnd <<= V_PARAM_SHIFT;
 		do_div(target_cwnd, rtt);
 


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

queue-3.4/tcp-fix-integer-overflow-in-tcp-vegas.patch
queue-3.4/tcp-fix-integer-overflows-in-tcp-veno.patch
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