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Code Issues Projects Releases Wiki Activity

vxlan: Use RCU apis to access sk_user_data. 

Use of RCU api makes vxlan code easier to understand.  It also
fixes bug due to missing ACCESS_ONCE() on sk_user_data dereference.
In rare case without ACCESS_ONCE() compiler might omit vs on
sk_user_data dereference.
Compiler can use vs as alias for sk->sk_user_data, resulting in
multiple sk_user_data dereference in rcu read context which
could change.

Change-Id: Idfb7a01f41ebbf91aaab2b5cb40fe42e9e803539
CC: Jesse Gross <jesse@nicira.com>
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pravin B Shelar 2013-09-24 10:25:40 -07:00 committed by L R
parent e992ec0e55
commit 62dea4f846
1 changed files with 5 additions and 0 deletions
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5
include/net/sock.h
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@ -418,6 +418,11 @@ struct sock {
void (*sk_destruct)(struct sock *sk);
};
#define __sk_user_data(sk) ((*((void __rcu **)&(sk)->sk_user_data)))
#define rcu_dereference_sk_user_data(sk) rcu_dereference(__sk_user_data((sk)))
#define rcu_assign_sk_user_data(sk, ptr) rcu_assign_pointer(__sk_user_data((sk)), ptr)
/*
* SK_CAN_REUSE and SK_NO_REUSE on a socket mean that the socket is OK
* or not whether his port will be reused by someone else. SK_FORCE_REUSE