Patch "tcp: fix tcp_md5_hash_skb_data()" has been added to the 3.9-stable tree

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

    tcp: fix tcp_md5_hash_skb_data()

to the 3.9-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-tcp_md5_hash_skb_data.patch
and it can be found in the queue-3.9 subdirectory.

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


>From 0fdefe46a0af027d26bf6773e380afc772b61ffb Mon Sep 17 00:00:00 2001
From: Eric Dumazet <edumazet@xxxxxxxxxx>
Date: Mon, 13 May 2013 21:25:52 +0000
Subject: tcp: fix tcp_md5_hash_skb_data()

From: Eric Dumazet <edumazet@xxxxxxxxxx>

[ Upstream commit 54d27fcb338bd9c42d1dfc5a39e18f6f9d373c2e ]

TCP md5 communications fail [1] for some devices, because sg/crypto code
assume page offsets are below PAGE_SIZE.

This was discovered using mlx4 driver [2], but I suspect loopback
might trigger the same bug now we use order-3 pages in tcp_sendmsg()

[1] Failure is giving following messages.

huh, entered softirq 3 NET_RX ffffffff806ad230 preempt_count 00000100,
exited with 00000101?

[2] mlx4 driver uses order-2 pages to allocate RX frags

Reported-by: Matt Schnall <mischnal@xxxxxxxxxx>
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Cc: Bernhard Beck <bbeck@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/ipv4/tcp.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -3383,8 +3383,11 @@ int tcp_md5_hash_skb_data(struct tcp_md5
 
 	for (i = 0; i < shi->nr_frags; ++i) {
 		const struct skb_frag_struct *f = &shi->frags[i];
-		struct page *page = skb_frag_page(f);
-		sg_set_page(&sg, page, skb_frag_size(f), f->page_offset);
+		unsigned int offset = f->page_offset;
+		struct page *page = skb_frag_page(f) + (offset >> PAGE_SHIFT);
+
+		sg_set_page(&sg, page, skb_frag_size(f),
+			    offset_in_page(offset));
 		if (crypto_hash_update(desc, &sg, skb_frag_size(f)))
 			return 1;
 	}


Patches currently in stable-queue which might be from edumazet@xxxxxxxxxx are

queue-3.9/packet-set-transport-header-before-doing-xmit.patch
queue-3.9/ipv6-fix-possible-crashes-in-ip6_cork_release.patch
queue-3.9/netback-set-transport-header-before-passing-it-to-kernel.patch
queue-3.9/tcp-xps-fix-reordering-issues.patch
queue-3.9/net_sched-restore-overhead-xxx-handling.patch
queue-3.9/net_sched-better-precise-estimation-on-packet-length-for-untrusted-packets.patch
queue-3.9/ip_tunnel-fix-kernel-panic-with-icmp_dest_unreach.patch
queue-3.9/tcp-fix-tcp_md5_hash_skb_data.patch
queue-3.9/net_sched-htb-do-not-mix-1ns-and-64ns-time-units.patch
queue-3.9/tuntap-set-transport-header-before-passing-it-to-kernel.patch
queue-3.9/tuntap-correct-the-return-value-in-tun_set_iff.patch
queue-3.9/net-force-a-reload-of-first-item-in-hlist_nulls_for_each_entry_rcu.patch
queue-3.9/macvtap-set-transport-header-before-passing-skb-to-lower-device.patch
queue-3.9/net-802-mrp-fix-lockdep-splat.patch
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