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Message-ID: <Y5GgUoGHfoRC5pib@unreal>
Date: Thu, 8 Dec 2022 10:29:06 +0200
From: Leon Romanovsky <leon@...nel.org>
To: Zhang Changzhong <zhangchangzhong@...wei.com>
Cc: Giuseppe Cavallaro <peppe.cavallaro@...com>,
Alexandre Torgue <alexandre.torgue@...s.st.com>,
Jose Abreu <joabreu@...opsys.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] net: stmmac: selftests: fix potential memleak in
stmmac_test_arpoffload()
On Wed, Dec 07, 2022 at 06:07:16PM +0800, Zhang Changzhong wrote:
> On 2022/12/7 17:12, Leon Romanovsky wrote:
> > On Wed, Dec 07, 2022 at 04:31:59PM +0800, Zhang Changzhong wrote:
> >> The skb allocated by stmmac_test_get_arp_skb() hasn't been released in
> >> some error handling case, which will lead to a memory leak. Fix this up
> >> by adding kfree_skb() to release skb.
> >>
> >> Compile tested only.
> >>
> >> Fixes: 5e3fb0a6e2b3 ("net: stmmac: selftests: Implement the ARP Offload test")
> >> Signed-off-by: Zhang Changzhong <zhangchangzhong@...wei.com>
> >> ---
> >> drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c | 8 ++++++--
> >> 1 file changed, 6 insertions(+), 2 deletions(-)
> >>
> >> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c
> >> index 49af7e7..687f43c 100644
> >> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c
> >> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c
> >> @@ -1654,12 +1654,16 @@ static int stmmac_test_arpoffload(struct stmmac_priv *priv)
> >> }
> >>
> >> ret = stmmac_set_arp_offload(priv, priv->hw, true, ip_addr);
> >> - if (ret)
> >> + if (ret) {
> >> + kfree_skb(skb);
> >> goto cleanup;
> >> + }
> >>
> >> ret = dev_set_promiscuity(priv->dev, 1);
> >> - if (ret)
> >> + if (ret) {
> >> + kfree_skb(skb);
> >> goto cleanup;
> >> + }
> >>
> >> ret = dev_direct_xmit(skb, 0);
> >> if (ret)
> >
> > You should release skb here too. So the better patch will be to write
> > something like that:
> >
>
> Hi Leon,
>
> Thanks for your review, but I don't think we need release skb here,
> because dev_direct_xmit() is responsible for freeing it.
Interesting, __dev_direct_xmit() releases skb too.
Thanks for the clarification.
>
> Regards,
> Changzhong
>
> > cleanup:
> > stmmac_set_arp_offload(priv, priv->hw, false, 0x0);
> > if (ret)
> > kfree_skb(skb);
> >> Thanks
> >
> >> --
> >> 2.9.5
> >>
> > .
> >
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