usb: gadget: f_fs: Fix ffs_epfile_read_iter to handle ITER_UBUF

iov_iter for ffs_epfile_read_iter can be ITER_UBUF with io_uring.
In that case dup_iter() does not have to allocate anything and it
can return NULL. ffs_epfile_read_iter treats this as a failure and
returns -ENOMEM. Fix it by checking if iter_is_ubuf().

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/20230401060509.3608259-2-dhavale@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
index ddfc537c7526b2256dd4a17f85daab0d8b1f739d..56cdfb2e42113eb27b29e2f675a104d84503c737 100644 (file)
--- a/drivers/usb/gadget/function/f_fs.c
+++ b/drivers/usb/gadget/function/f_fs.c
@@ -1251,7 +1251,7 @@ static ssize_t ffs_epfile_read_iter(struct kiocb *kiocb, struct iov_iter *to)
        p->kiocb = kiocb;
        if (p->aio) {
                p->to_free = dup_iter(&p->data, to, GFP_KERNEL);
-               if (!p->to_free) {
+               if (!iter_is_ubuf(&p->data) && !p->to_free) {
                        kfree(p);
                        return -ENOMEM;
                }