[PATCH 4.9 19/83] fuse: Fix use-after-free in fuse_dev_do_write()

[Greg Kroah-Hartman]

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Kirill Tkhai <ktk...@virtuozzo.com>

commit d2d2d4fb1f54eff0f3faa9762d84f6446a4bc5d0 upstream.

After we found req in request_find() and released the lock,
everything may happen with the req in parallel:

cpu0                              cpu1
fuse_dev_do_write()               fuse_dev_do_write()
  req = request_find(fpq, ...)    ...
  spin_unlock(&fpq->lock)         ...
  ...                             req = request_find(fpq, oh.unique)
  ...                             spin_unlock(&fpq->lock)
  queue_interrupt(&fc->iq, req);   ...
  ...                              ...
  ...                              ...
  request_end(fc, req);
    fuse_put_request(fc, req);
  ...                              queue_interrupt(&fc->iq, req);


Signed-off-by: Kirill Tkhai <ktk...@virtuozzo.com>
Signed-off-by: Miklos Szeredi <mszer...@redhat.com>
Fixes: 46c34a348b0a ("fuse: no fc->lock for pqueue parts")
Cc: <sta...@vger.kernel.org> # v4.2
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 fs/fuse/dev.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -1868,16 +1868,20 @@ static ssize_t fuse_dev_do_write(struct
 
        /* Is it an interrupt reply? */
        if (req->intr_unique == oh.unique) {
+               __fuse_get_request(req);
                spin_unlock(&fpq->lock);
 
                err = -EINVAL;
-               if (nbytes != sizeof(struct fuse_out_header))
+               if (nbytes != sizeof(struct fuse_out_header)) {
+                       fuse_put_request(fc, req);
                        goto err_finish;
+               }
 
                if (oh.error == -ENOSYS)
                        fc->no_interrupt = 1;
                else if (oh.error == -EAGAIN)
                        queue_interrupt(&fc->iq, req);
+               fuse_put_request(fc, req);
 
                fuse_copy_finish(cs);
                return nbytes;