usb: raw-gadget: do not limit transfer length

commit 37b9dd0d114a0e38c502695e30f55a74fb0c37d0 upstream.

Drop the check on the maximum transfer length in Raw Gadget for both
control and non-control transfers.

Limiting the transfer length causes a problem with emulating USB devices
whose full configuration descriptor exceeds PAGE_SIZE in length.

Overall, there does not appear to be any reason to enforce any kind of
transfer length limit on the Raw Gadget side for either control or
non-control transfers, so let's just drop the related check.

Cc: stable <stable@kernel.org>
Fixes: f2c2e717642c ("usb: gadget: add raw-gadget interface")
Signed-off-by: Andrey Konovalov <andreyknvl@gmail.com>
Link: https://patch.msgid.link/a6024e8eab679043e9b8a5defdb41c4bda62f02b.1761085528.git.andreyknvl@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/gadget/legacy/raw_gadget.c b/drivers/usb/gadget/legacy/raw_gadget.c
index 20165e1582d9ba42e8787a2d073844bebc6e1671..b71680c58de6c73e42d1df49ddd399915ab001f2 100644 (file)
--- a/drivers/usb/gadget/legacy/raw_gadget.c
+++ b/drivers/usb/gadget/legacy/raw_gadget.c
@@ -667,8 +667,6 @@ static void *raw_alloc_io_data(struct usb_raw_ep_io *io, void __user *ptr,
                return ERR_PTR(-EINVAL);
        if (!usb_raw_io_flags_valid(io->flags))
                return ERR_PTR(-EINVAL);
-       if (io->length > PAGE_SIZE)
-               return ERR_PTR(-EINVAL);
        if (get_from_user)
                data = memdup_user(ptr + sizeof(*io), io->length);
        else {