On Wed, Aug 7, 2019 at 2:33 AM Takashi Iwai <tiwai@xxxxxxx> wrote:
>
> On Wed, 07 Aug 2019 08:15:17 +0200,
> Wenwen Wang wrote:
> >
> > In hiface_pcm_init(), 'rt' is firstly allocated through kzalloc(). Later
> > on, hiface_pcm_init_urb() is invoked to initialize 'rt->out_urbs[i]'.
> > However, if the initialization fails, 'rt' is not deallocated, leading to a
> > memory leak bug.
> >
> > To fix the above issue, free 'rt' before returning the error.
> >
> > Signed-off-by: Wenwen Wang <wenwen@xxxxxxxxxx>
> > ---
> > sound/usb/hiface/pcm.c | 4 +++-
> > 1 file changed, 3 insertions(+), 1 deletion(-)
> >
> > diff --git a/sound/usb/hiface/pcm.c b/sound/usb/hiface/pcm.c
> > index 14fc1e1..5dbcd0d 100644
> > --- a/sound/usb/hiface/pcm.c
> > +++ b/sound/usb/hiface/pcm.c
> > @@ -599,8 +599,10 @@ int hiface_pcm_init(struct hiface_chip *chip, u8
> > extra_freq)
> > for (i = 0; i < PCM_N_URBS; i++) {
> > ret = hiface_pcm_init_urb(&rt->out_urbs[i], chip, OUT_EP,
> > hiface_pcm_out_urb_handler);
> > - if (ret < 0)
> > + if (ret < 0) {
> > + kfree(rt);
> > return ret;
> > + }
>
> Unfortunately this still leaves some memory. We need to release
> rt->out_urbs[], too. The relevant code is already in
> hiface_pcm_destroy(), so factor out the looped kfree() there and call
> it from both places.
>
> Care to resubmit with more fixes?
Thanks for your comments! I also found this issue, and am working on
another patch to fix it.
Wenwen
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