linux-kernel - Re: [PATCH] [SCSI] iscsi_boot_sysfs: Fix a memory leak in iscsi_boot_destroy

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Message-ID: <20131211171819.GB8078@phenom.dumpdata.com>
Date:	Wed, 11 Dec 2013 12:18:19 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Mike Christie <michaelc@...wisc.edu>
Cc:	Ethan Zhao <ethan.kernel@...il.com>, pjones@...hat.com,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] [SCSI] iscsi_boot_sysfs: Fix a memory leak in
 iscsi_boot_destroy_kset()

On Tue, Dec 10, 2013 at 12:46:36PM -0600, Mike Christie wrote:
> On 12/10/13 8:11 AM, Konrad Rzeszutek Wilk wrote:
> >Ethan Zhao <ethan.kernel@...il.com> wrote:
> >>Konrad,
> >>
> >>boot_kset was allocated when module loaded by
> >>ibft_init()
> >>  iscsi_boot_create_kset()
> >>     kzalloc()
> >>
> >>but wasn't freed when module unloaded by
> >>ibft_exit()
> >>   ibft_cleanup()
> >>     iscsi_boot_destroy_kset()
> >>
> >>Thanks,
> >>Ethan
> >>
> >>On Tue, Dec 10, 2013 at 5:30 AM, Konrad Rzeszutek Wilk
> >><konrad.wilk@...cle.com> wrote:
> >>>On Mon, Dec 09, 2013 at 05:37:11PM +0800, Ethan Zhao wrote:
> >>>>From: "Ethan Zhao" <ethan.kernel@...il.com>
> >>>>
> >>>>Load and unload iscsi_ibft module will cause kernel memory leak, fix
> >>it
> >>>>in scsi/iscsi_boot_sysfs.c iscsi_boot_destroy_kset().
> >>>>
> >>>
> >>>Is there a stack trace?
> >>>>Signed-off-by: Ethan Zhao <ethan.kernel@...il.com>
> >>>>---
> >>>>  drivers/scsi/iscsi_boot_sysfs.c | 1 +
> >>>>  1 file changed, 1 insertion(+)
> >>>>
> >>>>diff --git a/drivers/scsi/iscsi_boot_sysfs.c
> >>b/drivers/scsi/iscsi_boot_sysfs.c
> >>>>index 14c1c8f..680bf6f 100644
> >>>>--- a/drivers/scsi/iscsi_boot_sysfs.c
> >>>>+++ b/drivers/scsi/iscsi_boot_sysfs.c
> >>>>@@ -490,5 +490,6 @@ void iscsi_boot_destroy_kset(struct
> >>iscsi_boot_kset *boot_kset)
> >>>>               iscsi_boot_remove_kobj(boot_kobj);
> >>>>
> >>>>       kset_unregister(boot_kset->kset);
> >>>>+     kfree(boot_kset);
> >>>>  }
> >>>>  EXPORT_SYMBOL_GPL(iscsi_boot_destroy_kset);
> >>>>--
> >>>>1.8.3.4 (Apple Git-47)
> >>>>
> >
> >Right. In the past we did not do that b/c certain drivers (like broadcom) would allocate on the kset their name and try to free (the driver would after freeing the ibft). So you would end up with this patch a double free ( and it might be fixed by now but I can't recall).
> >
> 
> Do you mean the name string that is passed into kset_create_and_add?

Yes.
> If so that should not happen now. There does not seem to be any user
> freeing that string.
> 
> There used to be bug where at the initiator/target/ethernet level
> there was a double free because iscsi_boot_sysfs and be2iscsi were
> both freeing the struct associated with the
> initiator/target/ethernet. That is fixed in
> f457a46f179df41b0f6d80dee33b6e629945f276.

That is the one!
> 
> 
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