USB: core: Avoid WARNings for 0-length descriptor requests
The USB core has utility routines to retrieve various types of descriptors. These routines will now provoke a WARN if they are asked to retrieve 0 bytes (USB "receive" requests must not have zero length), so avert this by checking the size argument at the start. CC: Johan Hovold <johan@kernel.org> Reported-and-tested-by:<syzbot+7dbcd9ff34dc4ed45240@syzkaller.appspotmail.com> Reviewed-by:
Johan Hovold <johan@kernel.org> Signed-off-by:
Alan Stern <stern@rowland.harvard.edu> Link: https://lore.kernel.org/r/20210607152307.GD1768031@rowland.harvard.edu Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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