usb: gadgetfs: Fix ep_read_iter to handle ITER_UBUF

iov_iter for ep_read_iter can be ITER_UBUF with io_uring.
In that case dup_iter() does not have to allocate iov and it can
return NULL. Fix the assumption by checking for iter_is_ubuf()
other wise ep_read_iter can treat this as failure and return -ENOMEM.

Fixes: 1e23db450cff ("io_uring: use iter_ubuf for single range imports")
Signed-off-by: Sandeep Dhavale <dhavale@google.com>
Acked-by: Jens Axboe <axboe@kernel.dk>
Link: https://lore.kernel.org/r/20230401060509.3608259-3-dhavale@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/gadget/legacy/inode.c b/drivers/usb/gadget/legacy/inode.c
index d605bc2..28249d0 100644 (file)
--- a/drivers/usb/gadget/legacy/inode.c
+++ b/drivers/usb/gadget/legacy/inode.c
@@ -614,7 +614,7 @@ ep_read_iter(struct kiocb *iocb, struct iov_iter *to)
                if (!priv)
                        goto fail;
                priv->to_free = dup_iter(&priv->to, to, GFP_KERNEL);
-               if (!priv->to_free) {
+               if (!iter_is_ubuf(&priv->to) && !priv->to_free) {
                        kfree(priv);
                        goto fail;
                }