Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi...

Pull fuse fixes from Miklos Szeredi:
 "Fix a use after free bug introduced in 4.2 and using an uninitialized
  value introduced in 4.9"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse:
  fuse: fix uninitialized flags in pipe_buffer
  fuse: fix use after free issue in fuse_dev_do_read()

diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index 4e06a27ed7f80d4d0472e3d6c9e9fe3f0f1d7da5..f11792672977d2280ec7fc301f81e9b1b1ba7741 100644 (file)
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -399,6 +399,10 @@ static void request_end(struct fuse_conn *fc, struct fuse_req *req)
 static void queue_interrupt(struct fuse_iqueue *fiq, struct fuse_req *req)
 {
        spin_lock(&fiq->waitq.lock);
+       if (test_bit(FR_FINISHED, &req->flags)) {
+               spin_unlock(&fiq->waitq.lock);
+               return;
+       }
        if (list_empty(&req->intr_entry)) {
                list_add_tail(&req->intr_entry, &fiq->interrupts);
                wake_up_locked(&fiq->waitq);
@@ -1372,6 +1376,7 @@ static ssize_t fuse_dev_splice_read(struct file *in, loff_t *ppos,
                 * code can Oops if the buffer persists after module unload.
                 */
                bufs[page_nr].ops = &nosteal_pipe_buf_ops;
+               bufs[page_nr].flags = 0;
                ret = add_to_pipe(pipe, &bufs[page_nr++]);
                if (unlikely(ret < 0))
                        break;