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In normal operation we should never attempt to put more data into the data[] array than it can hold. However if the SPI controller connected to us misbehaves then it can send us a sequence of commands that attempt this. Since the controller might be in the guest (if the hardware does SPI via bit-banging), catch the possible overrun conditions and reset the flash internal state, logging them as guest errors. Signed-off-by: Jean-Christophe Dubois <jcd@tribudubois.net> Message-id: 20170107111631.24444-1-jcd@tribudubois.net Reviewed-by: Peter Maydell <peter.maydell@linaro.org> [PMM: rewrote commit message to be more exact about when this can happen] Signed-off-by: Peter Maydell <peter.maydell@linaro.org>