Re: UBSAN: Undefined behaviour in drivers/net/wireless/intel/iwlwifi/mvm/utils.c:838:5

[Paul Menzel]

Dear Luca,


Am 18.12.2017 um 19:30 schrieb Luca Coelho:
> On Wed, 2017-12-13 at 16:32 +0200, Luciano Coelho wrote:
> > On Wed, 2017-12-13 at 14:25 +0100, Paul Menzel wrote:

> > > I enabled the undefined behavior sanitizer, and built Linusâ 
> > > master branch under Ubuntu 17.10 with gcc (Ubuntu 7.2.0-8ubuntu3)
> > > 7.2.0.
> > >
> > > ``` $ grep UBSAN /boot/config-4.15.0-rc3+ 
> > > CONFIG_ARCH_HAS_UBSAN_SANITIZE_ALL=y #
> > > CONFIG_ARCH_WANTS_UBSAN_NO_NULL is not set CONFIG_UBSAN=y 
> > > CONFIG_UBSAN_SANITIZE_ALL=y # CONFIG_UBSAN_ALIGNMENT is not set 
> > > CONFIG_UBSAN_NULL=y ```
> > >
> > > Starting the system the messages below are printed.
> > >
> > > Starting the system and using the wireless device shows the 
> > > messages below.
> >
> > Thanks for reporting! This shouldn't cause any problems, but I'll
> > fix it by checking that the mac80211_queue is not INVALID_QUEUE
> > (255) which seems to be the trigger for this warning.
>
> Can you try the following patch to see if the problem goes away?
>
> http://pastebin.coelho.fi/7b624f474846da52.txt

Thank you. The warning is gone now. Thank you. For the next time, itâd 
be great to provide the output of `git format-patch -1`, which can be 
applied with `git am`. The output of `git show` is with my knowledge 
hard to apply.


Kind regards,

Paul