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

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Date:   Wed, 13 Dec 2017 16:32:32 +0200
From:   Luciano Coelho <luciano.coelho@...el.com>
To:     Paul Menzel <pmenzel+linux-wireless@...gen.mpg.de>,
        Johannes Berg <johannes.berg@...el.com>,
        Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
        Intel Linux Wireless <linuxwifi@...el.com>
Cc:     linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
        it+linux-wireless@...gen.mpg.de
Subject: Re: UBSAN: Undefined behaviour in
 drivers/net/wireless/intel/iwlwifi/mvm/utils.c:838:5

On Wed, 2017-12-13 at 14:25 +0100, Paul Menzel wrote:
> Dear Linux folks,
> 
> 
> I enabled the undefined behavior sanitizer, and built Linus’ 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.

--
Cheers,
Luca.