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Merge branch 'strparser-Fix-lockdep-issue'

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Tom Herbert says:

====================
strparser: Fix lockdep issue

When sock_owned_by_user returns true in strparser. Fix is to add and
call sock_owned_by_user_nocheck since the check for owned by user is
not an error condition in this case.
====================

Fixes: 43a0c6751a ("strparser: Stream parser for messages")
Reported-by: syzbot <syzkaller@googlegroups.com>
Reported-and-tested-by: <syzbot+c91c53af67f9ebe599a337d2e70950366153b295@syzkaller.appspotmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2017-12-28 14:28:23 -05:00
commit d5902f6d1f
2 changed files with 6 additions and 1 deletions
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5
include/net/sock.h
View File

@ -1514,6 +1514,11 @@ static inline bool sock_owned_by_user(const struct sock *sk)
return sk->sk_lock.owned; return sk->sk_lock.owned;
} }
static inline bool sock_owned_by_user_nocheck(const struct sock *sk)
{
return sk->sk_lock.owned;
}
/* no reclassification while locks are held */ /* no reclassification while locks are held */
static inline bool sock_allow_reclassification(const struct sock *csk) static inline bool sock_allow_reclassification(const struct sock *csk)
{ {

2
net/strparser/strparser.c
View File

@ -401,7 +401,7 @@ void strp_data_ready(struct strparser *strp)
* allows a thread in BH context to safely check if the process * allows a thread in BH context to safely check if the process
* lock is held. In this case, if the lock is held, queue work. * lock is held. In this case, if the lock is held, queue work.
*/ */
if (sock_owned_by_user(strp->sk)) { if (sock_owned_by_user_nocheck(strp->sk)) {
queue_work(strp_wq, &strp->work); queue_work(strp_wq, &strp->work);
return; return;
} }