commit ca35a0ef85e8ed6df6d5ab01fb6c3530cca0c469
author Eric Dumazet <eric.dumazet@gmail.com> Mon Oct 24 01:52:35 2011 -0400
committer David S. Miller <davem@davemloft.net> Mon Oct 24 01:52:35 2011 -0400
tree 3a6d0c107ec48823bb3e437f1f91d2276facb46d
parent 01718e36df750670d0f840932a4d166522ead6c3

tcp: md5: dont write skb head in tcp_md5_hash_header()

tcp_md5_hash_header() writes into skb header a temporary zero value,
this might confuse other users of this area.

Since tcphdr is small (20 bytes), copy it in a temporary variable and
make the change in the copy.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/tcp.h

diff --git a/include/net/tcp.h b/include/net/tcp.h
index 3edef0b..910cc29 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1209,7 +1209,7 @@
 extern struct tcp_md5sig_pool	*tcp_get_md5sig_pool(void);
 extern void tcp_put_md5sig_pool(void);
 
-extern int tcp_md5_hash_header(struct tcp_md5sig_pool *, struct tcphdr *);
+extern int tcp_md5_hash_header(struct tcp_md5sig_pool *, const struct tcphdr *);
 extern int tcp_md5_hash_skb_data(struct tcp_md5sig_pool *, const struct sk_buff *,
 				 unsigned header_len);
 extern int tcp_md5_hash_key(struct tcp_md5sig_pool *hp,