tcp: fix tcp_md5_hash_skb_data()
authorEric Dumazet <edumazet@google.com>
Mon, 13 May 2013 21:25:52 +0000 (21:25 +0000)
committerDavid S. Miller <davem@davemloft.net>
Tue, 14 May 2013 18:32:04 +0000 (11:32 -0700)
commit54d27fcb338bd9c42d1dfc5a39e18f6f9d373c2e
treeb58af078897a29f931399b78d27655aea5c016a6
parentefee8e8712921279c3a5a687d5b65ee7fde7db89
tcp: fix tcp_md5_hash_skb_data()

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@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Bernhard Beck <bbeck@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/ipv4/tcp.c