linux-kernel - Re: [PATCH] ALSA: usb-audio: Fix a potential memory leak in scarlett2_init

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Date:   Tue, 05 Sep 2023 07:39:41 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        alsa-devel@...a-project.org
Subject: Re: [PATCH] ALSA: usb-audio: Fix a potential memory leak in scarlett2_init_notify()

On Mon, 04 Sep 2023 16:08:15 +0200,
Takashi Iwai wrote:
> 
> On Sun, 03 Sep 2023 21:42:55 +0200,
> Christophe JAILLET wrote:
> > 
> > Le 03/09/2023 à 18:37, Takashi Iwai a écrit :
> > > On Sun, 03 Sep 2023 17:04:47 +0200,
> > ...
> > For the start_input_streams() caller, this is fine, because the
> > corresponding memory is kzalloc()'ed in start_input_streams() at some
> > point, but I've not been able to check for snd_usb_midi_v2_open().

Oh I overlooked that point.  Yes, it's a missing call, although the
memory leaks as free_midi_urbs() is called also at the destructor,
free_midi2_endpoint(), too.  But it's definitely better to call at the
error path, too.  Will fix it up together and submit the proper fix
patch.


thanks,

Takashi



> > 
> > CJ
> > 
> > > 
> > > --- a/sound/usb/midi2.c
> > > +++ b/sound/usb/midi2.c
> > > @@ -265,7 +265,7 @@ static void free_midi_urbs(struct snd_usb_midi2_endpoint *ep)
> > >     	if (!ep)
> > >   		return;
> > > -	for (i = 0; i < ep->num_urbs; ++i) {
> > > +	for (i = 0; i < NUM_URBS; ++i) {
> > >   		ctx = &ep->urbs[i];
> > >   		if (!ctx->urb)
> > >   			break;
> > > 
> > > That was the intended behavior of free_midi_urbs().
> > > 
> > > 
> > > Takashi
> > > 
> > 
>