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 3.15-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-3.15 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 08:56:13 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
@@ -219,7 +219,8 @@ 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-3.15/tcp-fix-integer-overflow-in-tcp-vegas.patch
queue-3.15/tcp-fix-integer-overflows-in-tcp-veno.patch
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