From: Chris Wulff <Chris.Wulff@biamp.com>
To: "linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Felipe Balbi <felipe.balbi@linux.intel.com>,
Ruslan Bilovol <ruslan.bilovol@gmail.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"stable@vger.kernel.org" <stable@vger.kernel.org>,
Chris Wulff <chris.wulff@biamp.com>
Subject: [PATCH] usb: gadget: u_audio: Clear uac pointer when freed.
Date: Thu, 25 Apr 2024 15:20:20 +0000 [thread overview]
Message-ID: <CO1PR17MB54194226DA08BFC9EBD8C163E1172@CO1PR17MB5419.namprd17.prod.outlook.com> (raw)
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@biamp.com>
---
v1: Split from https://lore.kernel.org/linux-usb/CO1PR17MB54190B898057616EEB3F9E51E10E2@CO1PR17MB5419.namprd17.prod.outlook.com/
drivers/usb/gadget/function/u_audio.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/usb/gadget/function/u_audio.c b/drivers/usb/gadget/function/u_audio.c
index c8e8154c59f5..ec1dceb08729 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);
--
2.34.1
reply other threads:[~2024-04-25 15:20 UTC|newest]
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