linux-kernel - Re: [PATCH v2] mm/damon/dbgfs: fix memory leak when using

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Date:   Sat, 3 Sep 2022 07:36:38 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     SeongJae Park <sj@...nel.org>
Cc:     akpm@...ux-foundation.org, damon@...ts.linux.dev,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH v2] mm/damon/dbgfs: fix memory leak when using

On Fri, Sep 02, 2022 at 07:11:49PM +0000, SeongJae Park wrote:
> From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> 
> debugfs_lookup()
> Date: Fri,  2 Sep 2022 14:56:31 +0200	[thread overview]
> Message-ID: <20220902125631.128329-1-gregkh@...uxfoundation.org> (raw)
> 
> When calling debugfs_lookup() the result must have dput() called on it,
> otherwise the memory will leak over time.  Fix this up by properly
> calling dput().
> 
> Fixes: 75c1c2b53c78b ("mm/damon/dbgfs: support multiple contexts")
> Cc: <stable@...r.kernel.org> # 5.15.x
> Cc: SeongJae Park <sj@...nel.org>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: damon@...ts.linux.dev
> Cc: linux-mm@...ck.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> Signed-off-by: SeongJae Park <sj@...nel.org>
> ---
> Changes from v1
> (https://lore.kernel.org/damon/20220902125631.128329-1-gregkh@linuxfoundation.org/)
> - Call dput() for failure-return case (Andrew Morton)

Thanks for fixing this up, I missed the other return error cases in my
rush to audit the whole tree at once.

This version looks great, and I see Andrew has taken it now into his
tree, thanks!

greg k-h