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Nicolas Frattaroli
6ffd02b822
By using a regular non-overflow-checking add, the MediaTek icc-emi
driver will happy wrap at U32_MAX + 1 to 0. As it's common for the
interconnect core to fill in INT_MAX values, this is not a hypothetical
situation, but something that actually happens in regular use. This
would be pretty disasterous if anything used this driver.
Replace the addition with an overflow-checked addition from overflow.h,
and saturate to U32_MAX if an overflow is detected.
Fixes: b45293799f ("interconnect: mediatek: Add MediaTek MT8183/8195 EMI Interconnect driver")
Reviewed-by: AngeloGioacchino Del Regno <[email protected]>
Signed-off-by: Nicolas Frattaroli <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Georgi Djakov <[email protected]>