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[ Upstream commit 0fb44559ffd67de8517098b81f675fa0210f13f0 ]
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
93ff5e03bc