linux-kernel - Re: [PATCH 1/3] ALSA: ymfpci: Use common error handling code in snd_card_ymfpci

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Date:   Thu, 07 Sep 2017 10:09:48 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     "SF Markus Elfring" <elfring@...rs.sourceforge.net>
Cc:     <alsa-devel@...a-project.org>,
        "Dan Carpenter" <dan.carpenter@...cle.com>,
        "Bhumika Goyal" <bhumirks@...il.com>,
        "Ingo Molnar" <mingo@...nel.org>,
        "Jaroslav Kysela" <perex@...ex.cz>,
        "David Howells" <dhowells@...hat.com>,
        <kernel-janitors@...r.kernel.org>,
        "LKML" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] ALSA: ymfpci: Use common error handling code in snd_card_ymfpci_probe()

On Thu, 07 Sep 2017 09:41:39 +0200,
SF Markus Elfring wrote:
> 
> >> @@ -336,21 +331,24 @@ static int snd_card_ymfpci_probe(struct pci_dev *pci,
> >>  			legacy_ctrl &= ~YMFPCI_LEGACY_FMEN;
> >>  			pci_write_config_word(pci, PCIR_DSXG_LEGACY, legacy_ctrl);
> >>  		} else if ((err = snd_opl3_hwdep_new(opl3, 0, 1, NULL)) < 0) {
> >> -			snd_card_free(card);
> >                         ^^^^^^^^^^^^^^^^^^^
> >>  			dev_err(card->dev, "cannot create opl3 hwdep\n");
> >                                 ^^^^^^^^^
> >> -			return err;
> >> +			goto free_card;
> > 
> > Heh.  I was worried that some of these re-orderings would introduce bugs
> > but actually this one fixes a use after free.
> 
> Thanks for your constructive feedback.
> 
> Does it mean that a special tag should be added to a commit message?

No need for resend, I'll add some more notes at merging.


thanks,

Takashi