Staging: rspiusb: Fix buffer overflow
usb_buffer_map_sg() may return -1. This will result in a read from pdx->PixelUrb[frameInfo][-1] Signed-off-by: Roel Kluin <roel.kluin@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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