RE: [PATCH] staging/hv: Fix memory leak of storvsc_dev_add()

[KY Srinivasan]

> -----Original Message-----
> From: Andre Bartke [mailto:andre.bartke@xxxxxxxxxxxxxx]
> Sent: Wednesday, June 01, 2011 12:32 PM
> To: KY Srinivasan
> Cc: Andre Bartke; gregkh@xxxxxxx; devel@xxxxxxxxxxxxxxxxxxxx; Haiyang Zhang;
> linux-kernel@xxxxxxxxxxxxxxx
> Subject: Re: [PATCH] staging/hv: Fix memory leak of storvsc_dev_add()
> 
> On Wed, 1 Jun 2011 12:28:40 +0000
> KY Srinivasan <kys@xxxxxxxxxxxxx> wrote:
> 
> >
> >
> > > -----Original Message-----
> > > From: devel-bounces@xxxxxxxxxxxxxxxxxxxxxx [mailto:devel-
> > > bounces@xxxxxxxxxxxxxxxxxxxxxx] On Behalf Of Andre Bartke
> > > Sent: Tuesday, May 31, 2011 5:46 PM
> > > To: gregkh@xxxxxxx
> > > Cc: devel@xxxxxxxxxxxxxxxxxxxx; Andre Bartke; Haiyang Zhang; linux-
> > > kernel@xxxxxxxxxxxxxxx
> > > Subject: [PATCH] staging/hv: Fix memory leak of storvsc_dev_add()
> > >
> > > stor_device is not freed in storvsc_dev_add()
> > > causing a memory leak in case of an allocation error.
> > >
> > > Signed-off-by: Andre Bartke <andre.bartke@xxxxxxxxx>
> > > ---
> > >  drivers/staging/hv/storvsc.c |    1 +
> > >  1 files changed, 1 insertions(+), 0 deletions(-)
> > >
> > > diff --git a/drivers/staging/hv/storvsc.c
> > > b/drivers/staging/hv/storvsc.c index 06cd327..92b44f4 100644
> > > --- a/drivers/staging/hv/storvsc.c
> > > +++ b/drivers/staging/hv/storvsc.c
> > > @@ -414,6 +414,7 @@ int storvsc_dev_add(struct hv_device *device,
> > >  	device_info->target_id = stor_device->target_id;
> > >
> > >  cleanup:
> > > +	free_stor_device(stor_device);
> > >  	return ret;
> >
> > Was this patch tested? Even the normal path falls through the cleanup
> > label and obviously you should not be freeing the stor_device in that
> > case. I have patches queued up to cleanup some of the unnecessary
> > labels and meaningless return values that I will be sending soon.
> >
> > Regards,
> >
> > K. Y
> >
> >
> >
> 
> Right, I really messed up there, here is how it was supposed to be
> 
> From 5fe8c601bae555b03257d0e7ea57e42a99c5e634 Mon Sep 17 00:00:00 2001
> From: Andre Bartke <andre.bartke@xxxxxxxxx>
> Date: Wed, 1 Jun 2011 18:18:58 +0200
> Subject: [PATCH] staging/hv: Fix memory leak of storvsc_dev_add()
> 
> stor_device is not freed in storvsc_dev_add()
> causing a memory leak in case of an allocation error.
> 
> Signed-off-by: Andre Bartke <andre.bartke@xxxxxxxxx>
> ---
>  drivers/staging/hv/storvsc.c |   12 ++++++++----
>  1 files changed, 8 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/staging/hv/storvsc.c b/drivers/staging/hv/storvsc.c
> index 06cd327..3d77c82 100644
> --- a/drivers/staging/hv/storvsc.c
> +++ b/drivers/staging/hv/storvsc.c
> @@ -392,10 +392,8 @@ int storvsc_dev_add(struct hv_device *device,
> 
>  	device_info = (struct storvsc_device_info *)additional_info;
>  	stor_device = alloc_stor_device(device);
> -	if (!stor_device) {
> -		ret = -1;
> -		goto cleanup;
> -	}
> +	if (!stor_device)
> +		goto err;
> 
>  	/* Save the channel properties to our storvsc channel */
> 
> @@ -413,6 +411,12 @@ int storvsc_dev_add(struct hv_device *device,
>  	device_info->path_id = stor_device->path_id;
>  	device_info->target_id = stor_device->target_id;
> 
> +	goto cleanup;
> +
> +err:
> +	ret = -1;
> +	free_stor_device(stor_device);
> +
>  cleanup:
>  	return ret;
>  }
> --
> 1.7.5.2
> 
This could be cleaned up much better; we don't need to additional labels. As I said,
earlier, I have patches queued up for this and a whole lot more. I will add your name to
the patch that fixes this issue.

Regards,

K. Y
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