Commit a2cf936e authored by Chris Wulff's avatar Chris Wulff Committed by Greg Kroah-Hartman
Browse files

usb: gadget: u_audio: Clear uac pointer when freed. 



This prevents use of a stale pointer if functions are called after
g_cleanup that shouldn't be. This doesn't fix any races, but converts
a possibly silent kernel memory corruption into an obvious NULL pointer
dereference report.

Fixes: eb9fecb9 ("usb: gadget: f_uac2: split out audio core")
Signed-off-by: default avatarChris Wulff <chris.wulff@biamp.com>
Link: https://lore.kernel.org/stable/CO1PR17MB54194226DA08BFC9EBD8C163E1172%40CO1PR17MB5419.namprd17.prod.outlook.com
Link: https://lore.kernel.org/r/CO1PR17MB54194226DA08BFC9EBD8C163E1172@CO1PR17MB5419.namprd17.prod.outlook.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 1b739388

drivers/usb/gadget/function/u_audio.c

+2 −0
Original line number Diff line number Diff line
@@ -1420,6 +1420,8 @@ void g_audio_cleanup(struct g_audio *g_audio) 
		return;



	uac = g_audio->uac;

	g_audio->uac = NULL;



	card = uac->card;

	if (card)

		snd_card_free_when_closed(card);