fuse: Fix use-after-free in fuse_dev_do_write()

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 <ktkhai@virtuozzo.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Fixes: 46c34a348b0a ("fuse: no fc->lock for pqueue parts")
Cc: <stable@vger.kernel.org> # v4.2

1 files changed, 5 insertions, 1 deletions

diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index 675caed3e655..c2af8042f176 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -1877,16 +1877,20 @@ static ssize_t fuse_dev_do_write(struct fuse_dev *fud,
 
         /* 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;