Re: UBSAN: Undefined behaviour in drivers/usb/core/devio.c:1517:25

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On Tue, 26 Jan 2016, Chris Bainbridge wrote:

> Booting 4.5.0-rc1 with new UBSAN checker enabled:
> 
> [    4.556968] ================================================================================
> [    4.556972] UBSAN: Undefined behaviour in drivers/usb/core/devio.c:1517:25
> [    4.556975] shift exponent -1 is negative

Does a left shift by a negative amount matter if the result isn't used?

Alan Stern

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