diff options
| author | WANG Cong <xiyou.wangcong@gmail.com> | 2017-01-23 11:17:35 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-01-24 14:30:56 -0500 |
| commit | 0fb44559ffd67de8517098b81f675fa0210f13f0 (patch) | |
| tree | 4fe2e2d2f415b7b831e8c3ee999a1915a24d2d4e | |
| parent | a59b7e0246774e28193126fe7fdbbd0ae9c67dcc (diff) | |
af_unix: move unix_mknod() out of bindlock
Dmitry reported a deadlock scenario:
unix_bind() path:
u->bindlock ==> sb_writer
do_splice() path:
sb_writer ==> pipe->mutex ==> u->bindlock
In the unix_bind() code path, unix_mknod() does not have to
be done with u->bindlock held, since it is a pure fs operation,
so we can just move unix_mknod() out.
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Tested-by: Dmitry Vyukov <dvyukov@google.com>
Cc: Rainer Weikusat <rweikusat@mobileactivedefense.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>