linux-kernel - Re: [PATCH net v1] net: acenic: fix an issue about leak related system resources

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Message-ID: <CAHp75VeAetsZsANoHx7X-g8+LOt0+NNarXheY5AR6L+LrdHavQ@mail.gmail.com>
Date:   Mon, 27 Apr 2020 13:40:02 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Dejin Zheng <zhengdejin5@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>, jes@...ined-monkey.org,
        linux-acenic@...site.dk, netdev <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net v1] net: acenic: fix an issue about leak related
 system resources

On Sat, Apr 25, 2020 at 4:40 PM Dejin Zheng <zhengdejin5@...il.com> wrote:
>
> the function ace_allocate_descriptors() and ace_init() can fail in
> the acenic_probe_one(), The related system resources were not
> released then. so change the error handling to fix it.

...

> @@ -568,7 +568,7 @@ static int acenic_probe_one(struct pci_dev *pdev,
>  #endif
>
>         if (ace_allocate_descriptors(dev))
> -               goto fail_free_netdev;
> +               goto fail_uninit;

Not sure.
The code is quite old and requires a lot of refactoring.

Briefly looking the error path there is quite twisted.

> @@ -580,7 +580,7 @@ static int acenic_probe_one(struct pci_dev *pdev,
>  #endif
>
>         if (ace_init(dev))
> -               goto fail_free_netdev;
> +               goto fail_uninit;

This change seems incorrect, the ace_init() calls ace_init_cleanup() on error.
So, your change makes it call the cleanup() twice.

-- 
With Best Regards,
Andy Shevchenko