This is a note to let you know that I've just added the patch titled
tcp: fastopen: avoid negative sk_forward_alloc
to the 4.7-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-fastopen-avoid-negative-sk_forward_alloc.patch
and it can be found in the queue-4.7 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 Wed Sep 21 10:05:18 CEST 2016
From: Eric Dumazet <edumazet@xxxxxxxxxx>
Date: Wed, 7 Sep 2016 08:34:11 -0700
Subject: tcp: fastopen: avoid negative sk_forward_alloc
From: Eric Dumazet <edumazet@xxxxxxxxxx>
[ Upstream commit 76061f631c2ea4ab9c4d66f3a96ecc5737f5aaf7 ]
When DATA and/or FIN are carried in a SYN/ACK message or SYN message,
we append an skb in socket receive queue, but we forget to call
sk_forced_mem_schedule().
Effect is that the socket has a negative sk->sk_forward_alloc as long as
the message is not read by the application.
Josh Hunt fixed a similar issue in commit d22e15371811 ("tcp: fix tcp
fin memory accounting")
Fixes: 168a8f58059a ("tcp: TCP Fast Open Server - main code path")
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Reviewed-by: Josh Hunt <johunt@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/ipv4/tcp_fastopen.c | 1 +
1 file changed, 1 insertion(+)
--- a/net/ipv4/tcp_fastopen.c
+++ b/net/ipv4/tcp_fastopen.c
@@ -150,6 +150,7 @@ void tcp_fastopen_add_skb(struct sock *s
tp->segs_in = 0;
tcp_segs_in(tp, skb);
__skb_pull(skb, tcp_hdrlen(skb));
+ sk_forced_mem_schedule(sk, skb->truesize);
skb_set_owner_r(skb, sk);
TCP_SKB_CB(skb)->seq++;
Patches currently in stable-queue which might be from edumazet@xxxxxxxxxx are
queue-4.7/bonding-fix-bonding-crash.patch
queue-4.7/tcp-properly-scale-window-in-tcp_v_reqsk_send_ack.patch
queue-4.7/tcp-fastopen-avoid-negative-sk_forward_alloc.patch
queue-4.7/udp-fix-poll-issue-with-zero-sized-packets.patch
queue-4.7/tcp-fix-use-after-free-in-tcp_xmit_retransmit_queue.patch
queue-4.7/tun-fix-transmit-timestamp-support.patch
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