This is a note to let you know that I've just added the patch titled
usb: gadget: u_audio: Clear uac pointer when freed.
to the 6.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-gadget-u_audio-clear-uac-pointer-when-freed.patch
and it can be found in the queue-6.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit fb4ba5e5d042106cf127387a3613e41116103707
Author: Chris Wulff <Chris.Wulff@xxxxxxxxx>
Date: Thu Apr 25 15:20:20 2024 +0000
usb: gadget: u_audio: Clear uac pointer when freed.
[ Upstream commit a2cf936ebef291ef7395172b9e2f624779fb6dc0 ]
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: eb9fecb9e69b ("usb: gadget: f_uac2: split out audio core")
Signed-off-by: Chris Wulff <chris.wulff@xxxxxxxxx>
Link: https://lore.kernel.org/stable/CO1PR17MB54194226DA08BFC9EBD8C163E1172%40CO1PR17MB5419.namprd17.prod.outlook.com
Link: https://lore.kernel.org/r/CO1PR17MB54194226DA08BFC9EBD8C163E1172@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/usb/gadget/function/u_audio.c b/drivers/usb/gadget/function/u_audio.c
index c8e8154c59f50..ec1dceb087293 100644
--- a/drivers/usb/gadget/function/u_audio.c
+++ b/drivers/usb/gadget/function/u_audio.c
@@ -1419,6 +1419,8 @@ 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);
