Xiubo Li 8e1858710d
ceph: avoid use-after-free in ceph_fl_release_lock() ...
When ceph releasing the file_lock it will try to get the inode pointer
from the fl->fl_file, which the memory could already be released by
another thread in filp_close(). Because in VFS layer the fl->fl_file
doesn't increase the file's reference counter.
Will switch to use ceph dedicate lock info to track the inode.
And in ceph_fl_release_lock() we should skip all the operations if the
fl->fl_u.ceph.inode is not set, which should come from the request
file_lock. And we will set fl->fl_u.ceph.inode when inserting it to the
inode lock list, which is when copying the lock.
Link: https://tracker.ceph.com/issues/57986
Signed-off-by: Xiubo Li <xiubli@redhat.com >
Reviewed-by: Jeff Layton <jlayton@kernel.org >
Reviewed-by: Ilya Dryomov <idryomov@gmail.com >
Signed-off-by: Ilya Dryomov <idryomov@gmail.com >
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8e1858710d