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The two additions were plain, so > a source or destination offset near the top of the 32-bit range would > have wrapped or panicked rather than failing the transfer. > > Add the two with checked arithmetic and fail the transfer with EOVERFLOW > when a sum does not fit. > > Assisted-by: LLM > Signed-off-by: John Hubbard > [acourbot: split out of the DMA helper patch of v3.] > Signed-off-by: Alexandre Courbot > --- Reviewed-by: Eliot Courtney