From mboxrd@z Thu Jan 1 00:00:00 1970 From: arnd@arndb.de (Arnd Bergmann) Date: Tue, 16 Feb 2016 17:09:43 +0100 Subject: [PATCH] sound: hdmi: avoid dereferencing uninitialized 'jack' pointer In-Reply-To: References: <1455634059-1896914-1-git-send-email-arnd@arndb.de> Message-ID: <2573932.AU4HSxN0NE@wuerfel> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Tuesday 16 February 2016 16:49:42 Takashi Iwai wrote: > > Thanks for the patch. But I think it's cleaner to fix Kconfig. > > Thinking more of it, maybe splitting jack stuff as a separate module > and does reverse-select to CONFIG_INPUT would be better. Then its > users can select simply SND_JACK, and everything would fit. > > Adding 'select INPUT' is rather nasty, I think that can lead to circular dependencies, and would likely upset users of small embedded systems that want to use audio but don't want to use input. Generally speaking, I would recommend never using 'select' on a user visible Kconfig symbol. Another option might would be to change snd_jack_new() to return an error if that SND_JACK is disabled, and then require all users to handle the error gracefully, i.e. not fail the probe() function but just not use the jack. Arnd