libfuse: fix multiple close of device fd

- fuse_kern_unmount closes handle (e.g. 19)
- a thread in my process opens a file - the OS assigns newly freed
handle (i.e. 19)
- fuse_kern_chan_destroy closes the same handle (i.e. 19)
- a thread in my process opens another file - the OS assigns newly
freed handle (i.e. 19)
- * MAYHEM *

Reported by Dan Greenfield

1 files changed, 2 insertions, 0 deletions

diff --git a/lib/fuse_i.h b/lib/fuse_i.h
index 78f1467..fa37156 100644
--- a/lib/fuse_i.h
+++ b/lib/fuse_i.h
@@ -106,6 +106,8 @@ struct fuse_session *fuse_lowlevel_new_common(struct fuse_args *args,
 					size_t op_size, void *userdata);
 
 void fuse_kern_unmount_compat22(const char *mountpoint);
+int fuse_chan_clearfd(struct fuse_chan *ch);
+
 void fuse_kern_unmount(const char *mountpoint, int fd);
 int fuse_kern_mount(const char *mountpoint, struct fuse_args *args);