linux-kernel - net: sctp: possible dereference after freeing

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Message-ID: <CAGG-pUTXC+6O-wyYp0FZxKH-XWqP++jLEn-Km5kixQFcKsWRZA@mail.gmail.com>
Date:	Sat, 19 Oct 2013 08:38:43 -0300
From:	Geyslan Gregório Bem <geyslan@...il.com>
To:	Vlad Yasevich <vyasevich@...il.com>
Cc:	Neil Horman <nhorman@...driver.com>,
	"David S. Miller" <davem@...emloft.net>,
	linux-sctp@...r.kernel.org, netdev@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: net: sctp: possible dereference after freeing

Hi maintainers,

I would like to know if these are catches:

/net/sctp/endpointola.c (281)
static void sctp_endpoint_destroy(struct sctp_endpoint *ep)
{
    struct sock *sk;
...
    kfree(ep);
    SCTP_DBG_OBJCNT_DEC(ep);
}

The 'ep' object counter is being decremented?! Is the kfree to be there indeed?
Let me know what was intended here.

Same here:
/net/sctp/endpointola.c (165)
static void sctp_transport_destroy_rcu(struct rcu_head *head)
{
    struct sctp_transport *transport;
...
    kfree(transport);
    SCTP_DBG_OBJCNT_DEC(transport);
}

Regards,

Geyslan Gregório Bem
hackingbits.com
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