linux-mm.kvack.org archive mirror
 help / color / mirror / Atom feed
* [PATCH v4] damon/sysfs: Fix possible memleak on damon_sysfs_add_target.
@ 2022-09-26 16:06 SeongJae Park
  2022-09-26 16:23 ` SeongJae Park
  0 siblings, 1 reply; 3+ messages in thread
From: SeongJae Park @ 2022-09-26 16:06 UTC (permalink / raw)
  To: akpm; +Cc: ppbuk5246, damon, linux-mm, linux-kernel, stable, SeongJae Park

From: Levi Yun <ppbuk5246@gmail.com>

When damon_sysfs_add_target couldn't find proper task,
New allocated damon_target structure isn't registered yet,
So, it's impossible to free new allocated one by
damon_sysfs_destroy_targets.

By calling daemon_add_target as soon as allocating new target, Fix this
possible memory leak.

Fixes: a61ea561c871 ("mm/damon/sysfs: link DAMON for virtual address spaces monitoring")
Cc: <stable@vger.kernel.org> # 5.17.x
Signed-off-by: Levi Yun <ppbuk5246@gmail.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Signed-off-by: SeongJae Park <sj@kernel.org>
---

Changes from v3
(https://lore.kernel.org/damon/20220925234327.26345-1-ppbuk5246@gmail.com/)
- Fix Fixes: tag
- Add patch changelog

Changes from v2
(https://lore.kernel.org/damon/20220925234053.26090-1-ppbuk5246@gmail.com/)
- Add Fixes: and Cc: stable

Changes from v1
(https://lore.kernel.org/damon/20220925140257.23431-1-ppbuk5246@gmail.com/)
- Do damon_add_target() earlier instead of explicitly freeing the object

 mm/damon/sysfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c
index 455215a5c059..9f1219a67e3f 100644
--- a/mm/damon/sysfs.c
+++ b/mm/damon/sysfs.c
@@ -2172,12 +2172,12 @@ static int damon_sysfs_add_target(struct damon_sysfs_target *sys_target,
 
 	if (!t)
 		return -ENOMEM;
+	damon_add_target(ctx, t);
 	if (damon_target_has_pid(ctx)) {
 		t->pid = find_get_pid(sys_target->pid);
 		if (!t->pid)
 			goto destroy_targets_out;
 	}
-	damon_add_target(ctx, t);
 	err = damon_sysfs_set_regions(t, sys_target->regions);
 	if (err)
 		goto destroy_targets_out;
-- 
2.25.1



^ permalink raw reply related	[flat|nested] 3+ messages in thread
* Re: [PATCH v4] damon/sysfs: Fix possible memleak on damon_sysfs_add_target.
  2022-09-26 16:06 [PATCH v4] damon/sysfs: Fix possible memleak on damon_sysfs_add_target SeongJae Park
@ 2022-09-26 16:23 ` SeongJae Park
  2022-09-27  1:52   ` Yun Levi
  0 siblings, 1 reply; 3+ messages in thread
From: SeongJae Park @ 2022-09-26 16:23 UTC (permalink / raw)
  To: SeongJae Park; +Cc: akpm, ppbuk5246, damon, linux-mm, linux-kernel, stable

I forgot removing the closing dot of the subject and making the subject
lower-case.

On Mon, 26 Sep 2022 16:06:11 +0000 SeongJae Park <sj@kernel.org> wrote:

> From: Levi Yun <ppbuk5246@gmail.com>
> 
> When damon_sysfs_add_target couldn't find proper task,
> New allocated damon_target structure isn't registered yet,
> So, it's impossible to free new allocated one by
> damon_sysfs_destroy_targets.
> 
> By calling daemon_add_target as soon as allocating new target, Fix this

Also we should s/daemon/damon/

I will revise and send v5.

> possible memory leak.
> 
> Fixes: a61ea561c871 ("mm/damon/sysfs: link DAMON for virtual address spaces monitoring")
> Cc: <stable@vger.kernel.org> # 5.17.x
> Signed-off-by: Levi Yun <ppbuk5246@gmail.com>
> Reviewed-by: SeongJae Park <sj@kernel.org>
> Signed-off-by: SeongJae Park <sj@kernel.org>
> ---
> 
> Changes from v3
> (https://lore.kernel.org/damon/20220925234327.26345-1-ppbuk5246@gmail.com/)
> - Fix Fixes: tag
> - Add patch changelog
> 
> Changes from v2
> (https://lore.kernel.org/damon/20220925234053.26090-1-ppbuk5246@gmail.com/)
> - Add Fixes: and Cc: stable
> 
> Changes from v1
> (https://lore.kernel.org/damon/20220925140257.23431-1-ppbuk5246@gmail.com/)
> - Do damon_add_target() earlier instead of explicitly freeing the object
> 
>  mm/damon/sysfs.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c
> index 455215a5c059..9f1219a67e3f 100644
> --- a/mm/damon/sysfs.c
> +++ b/mm/damon/sysfs.c
> @@ -2172,12 +2172,12 @@ static int damon_sysfs_add_target(struct damon_sysfs_target *sys_target,
>  
>  	if (!t)
>  		return -ENOMEM;
> +	damon_add_target(ctx, t);
>  	if (damon_target_has_pid(ctx)) {
>  		t->pid = find_get_pid(sys_target->pid);
>  		if (!t->pid)
>  			goto destroy_targets_out;
>  	}
> -	damon_add_target(ctx, t);
>  	err = damon_sysfs_set_regions(t, sys_target->regions);
>  	if (err)
>  		goto destroy_targets_out;
> -- 
> 2.25.1


^ permalink raw reply	[flat|nested] 3+ messages in thread
* Re: [PATCH v4] damon/sysfs: Fix possible memleak on damon_sysfs_add_target.
  2022-09-26 16:23 ` SeongJae Park
@ 2022-09-27  1:52   ` Yun Levi
  0 siblings, 0 replies; 3+ messages in thread
From: Yun Levi @ 2022-09-27  1:52 UTC (permalink / raw)
  To: SeongJae Park; +Cc: akpm, damon, linux-mm, linux-kernel, stable

Thanks :)

And Sorry to my mistake.

On Tue, Sep 27, 2022 at 1:23 AM SeongJae Park <sj@kernel.org> wrote:
>
> I forgot removing the closing dot of the subject and making the subject
> lower-case.
>
> On Mon, 26 Sep 2022 16:06:11 +0000 SeongJae Park <sj@kernel.org> wrote:
>
> > From: Levi Yun <ppbuk5246@gmail.com>
> >
> > When damon_sysfs_add_target couldn't find proper task,
> > New allocated damon_target structure isn't registered yet,
> > So, it's impossible to free new allocated one by
> > damon_sysfs_destroy_targets.
> >
> > By calling daemon_add_target as soon as allocating new target, Fix this
>
> Also we should s/daemon/damon/
>
> I will revise and send v5.
>
> > possible memory leak.
> >
> > Fixes: a61ea561c871 ("mm/damon/sysfs: link DAMON for virtual address spaces monitoring")
> > Cc: <stable@vger.kernel.org> # 5.17.x
> > Signed-off-by: Levi Yun <ppbuk5246@gmail.com>
> > Reviewed-by: SeongJae Park <sj@kernel.org>
> > Signed-off-by: SeongJae Park <sj@kernel.org>
> > ---
> >
> > Changes from v3
> > (https://lore.kernel.org/damon/20220925234327.26345-1-ppbuk5246@gmail.com/)
> > - Fix Fixes: tag
> > - Add patch changelog
> >
> > Changes from v2
> > (https://lore.kernel.org/damon/20220925234053.26090-1-ppbuk5246@gmail.com/)
> > - Add Fixes: and Cc: stable
> >
> > Changes from v1
> > (https://lore.kernel.org/damon/20220925140257.23431-1-ppbuk5246@gmail.com/)
> > - Do damon_add_target() earlier instead of explicitly freeing the object
> >
> >  mm/damon/sysfs.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c
> > index 455215a5c059..9f1219a67e3f 100644
> > --- a/mm/damon/sysfs.c
> > +++ b/mm/damon/sysfs.c
> > @@ -2172,12 +2172,12 @@ static int damon_sysfs_add_target(struct damon_sysfs_target *sys_target,
> >
> >       if (!t)
> >               return -ENOMEM;
> > +     damon_add_target(ctx, t);
> >       if (damon_target_has_pid(ctx)) {
> >               t->pid = find_get_pid(sys_target->pid);
> >               if (!t->pid)
> >                       goto destroy_targets_out;
> >       }
> > -     damon_add_target(ctx, t);
> >       err = damon_sysfs_set_regions(t, sys_target->regions);
> >       if (err)
> >               goto destroy_targets_out;
> > --
> > 2.25.1


^ permalink raw reply	[flat|nested] 3+ messages in thread
end of thread, other threads:[~2022-09-27  1:52 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-09-26 16:06 [PATCH v4] damon/sysfs: Fix possible memleak on damon_sysfs_add_target SeongJae Park
2022-09-26 16:23 ` SeongJae Park
2022-09-27  1:52   ` Yun Levi

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).