On Wed, 2016-05-18 at 10:40 +0300, Andrey Ryabinin wrote: > 2016-05-18 1:16 GMT+03:00 Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>: > > On Tue, May 17, 2016 at 05:52:40PM -0400, Valdis Kletnieks wrote: > >> So, not content in the amount of breakage I generate already, I > >> compiled with UBSAN enabled... > >> > >> The immediately relevant part: > >> > >> [ 2.418576] ================================================================================ > >> [ 2.418579] UBSAN: Undefined behaviour in drivers/usb/host/ehci-hub.c:877:47 > >> [ 2.418582] index -1 is out of range for type 'u32 [1]' > > > > <snip> > > > > It's a known bug in ubsan, > > It's not a bug. int *p = &a[-1] is undefined behavior. It doesn't > matter whether that pointer dereferenced or not. That is a bold statement. Pointer arithmetic is defined. How can the computation of an address be undefined behavior while it is not used? Regards Oliver -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
