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, 7 insertions, 0 deletions

diff --git a/lib/fuse_session.c b/lib/fuse_session.c
index c55f250..6e11068 100644
--- a/lib/fuse_session.c
+++ b/lib/fuse_session.c
@@ -182,6 +182,13 @@ int fuse_chan_fd(struct fuse_chan *ch)
 	return ch->fd;
 }
 
+int fuse_chan_clearfd(struct fuse_chan *ch)
+{
+       int fd = ch->fd;
+       ch->fd = -1;
+       return fd;
+}
+
 size_t fuse_chan_bufsize(struct fuse_chan *ch)
 {
 	return ch->bufsize;