linux-kernel - Re: [patch net] net: dsa: fix unbalanced dsa_switch

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Message-Id: <20161128.161623.368993152050525938.davem@davemloft.net>
Date:   Mon, 28 Nov 2016 16:16:23 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     nikita.yoush@...entembedded.com
Cc:     netdev@...r.kernel.org, cphealy@...il.com, andrew@...n.ch,
        linux-kernel@...r.kernel.org
Subject: Re: [patch net] net: dsa: fix unbalanced dsa_switch_tree reference
 counting

From: Nikita Yushchenko <nikita.yoush@...entembedded.com>
Date: Mon, 28 Nov 2016 09:48:48 +0300

> _dsa_register_switch() gets a dsa_switch_tree object either via
> dsa_get_dst() or via dsa_add_dst(). Former path does not increase kref
> in returned object (resulting into caller not owning a reference),
> while later path does create a new object (resulting into caller owning
> a reference).
> 
> The rest of _dsa_register_switch() assumes that it owns a reference, and
> calls dsa_put_dst().
> 
> This causes a memory breakage if first switch in the tree initialized
> successfully, but second failed to initialize. In particular, freed
> dsa_swith_tree object is left referenced by switch that was initialized,
> and later access to sysfs attributes of that switch cause OOPS.
> 
> To fix, need to add kref_get() call to dsa_get_dst().
> 
> Signed-off-by: Nikita Yushchenko <nikita.yoush@...entembedded.com>
> Fixes: 83c0afaec7b7 ("net: dsa: Add new binding implementation")
> Reviewed-by: Andrew Lunn <andrew@...n.ch>

Applied and queued up for -stable, thanks.