[PATCH net v1] net: acenic: fix an issue about leak related system resources

[PATCH net v1] net: acenic: fix an issue about leak related system resources

[Dejin Zheng]

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.

Fixes: 1da177e4c3f41524e8 ("Linux-2.6.12-rc2")
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com>
---
 drivers/net/ethernet/alteon/acenic.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/alteon/acenic.c b/drivers/net/ethernet/alteon/acenic.c
index 5d192d551623..32f9e68dd323 100644
--- a/drivers/net/ethernet/alteon/acenic.c
+++ b/drivers/net/ethernet/alteon/acenic.c
@@ -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;
 
 #ifdef MODULE
 	if (boards_found >= ACE_MAX_MOD_PARMS)
@@ -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;
 
 	if (register_netdev(dev)) {
 		printk(KERN_ERR "acenic: device registration failed\n");
-- 
2.25.0

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

[Andy Shevchenko]

On Sat, Apr 25, 2020 at 4:40 PM Dejin Zheng <zhengdejin5@gmail.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

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

[Dejin Zheng]

On Mon, Apr 27, 2020 at 01:40:02PM +0300, Andy Shevchenko wrote:
> On Sat, Apr 25, 2020 at 4:40 PM Dejin Zheng <zhengdejin5@gmail.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.
> 
Hi Andy:

Yes, this code is quite old, and There are also some mistakes in my
patch, abandon this commit first. Thanks!

BR,
Dejin
> -- 
> With Best Regards,
> Andy Shevchenko