linux-kernel - Re: [PATCH v2] btrfs: ref-verify: fix memory leaks

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Message-ID: <20231121130315.GP11264@twin.jikos.cz>
Date:   Tue, 21 Nov 2023 14:03:15 +0100
From:   David Sterba <dsterba@...e.cz>
To:     Bragatheswaran Manickavel <bragathemanick0908@...il.com>
Cc:     clm@...com, josef@...icpanda.com, dsterba@...e.com,
        linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzbot+d66de4cbf532749df35f@...kaller.appspotmail.com
Subject: Re: [PATCH v2] btrfs: ref-verify: fix memory leaks

On Sat, Nov 18, 2023 at 02:40:12PM +0530, Bragatheswaran Manickavel wrote:
> In btrfs_ref_tree_mod(), when !parent 're' was allocated
> through kmalloc(). In the following code, if an error occurs,
> the execution will be redirected to 'out' or 'out_unlock' and
> the function will be exited. However, on some of the paths,
> 're' are not deallocated and may lead to memory leaks.
> 
> For example : lookup_block_entry() for 'be' returns null, the
> out label will be invoked. During that flow ref and ra was
> freed but not re, which can potentially lead to memleak
> 
> Reported-and-tested-by: syzbot+d66de4cbf532749df35f@...kaller.appspotmail.com
> Closes: https://syzkaller.appspot.com/bug?extid=d66de4cbf532749df35f
> Signed-off-by: Bragatheswaran Manickavel <bragathemanick0908@...il.com>

Added to misc-next, thanks.