From: "Z.q. Hou" <zhiqiang.hou@nxp.com>
To: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: "linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"bhelgaas@google.com" <bhelgaas@google.com>,
"jingoohan1@gmail.com" <jingoohan1@gmail.com>,
"gustavo.pimentel@synopsys.com" <gustavo.pimentel@synopsys.com>,
Roy Zang <roy.zang@nxp.com>, Mingkai Hu <mingkai.hu@nxp.com>,
"M.h. Lian" <minghuan.lian@nxp.com>
Subject: RE: [PATCHv2 1/4] PCI: dwc: fix potential memory leak
Date: Thu, 6 Dec 2018 01:08:14 +0000 [thread overview]
Message-ID: <AM6PR04MB5781A44014DD60973E393A6B84A90@AM6PR04MB5781.eurprd04.prod.outlook.com> (raw)
In-Reply-To: <20181205154013.GA18294@e107981-ln.cambridge.arm.com>
Hi Lorenzo,
> -----Original Message-----
> From: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> Sent: 2018年12月5日 23:40
> To: Z.q. Hou <zhiqiang.hou@nxp.com>
> Cc: linux-pci@vger.kernel.org; linux-kernel@vger.kernel.org;
> bhelgaas@google.com; jingoohan1@gmail.com;
> gustavo.pimentel@synopsys.com; Roy Zang <roy.zang@nxp.com>; Mingkai Hu
> <mingkai.hu@nxp.com>; M.h. Lian <minghuan.lian@nxp.com>
> Subject: Re: [PATCHv2 1/4] PCI: dwc: fix potential memory leak
>
> On Wed, Nov 07, 2018 at 10:09:04AM +0000, Z.q. Hou wrote:
> > From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
> >
> > Free the allocated pci_host_bridge struct when failed to get host
> > bridge resources, and free the resource windows before free the
> > bridge.
> >
> > Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
> > Acked-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
> > ---
> > V2:
> > - Reworded the subject.
> >
> > drivers/pci/controller/dwc/pcie-designware-host.c | 3 ++-
> > 1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c
> > b/drivers/pci/controller/dwc/pcie-designware-host.c
> > index 29a05759a294..ecacce016489 100644
> > --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> > +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> > @@ -353,7 +353,7 @@ int dw_pcie_host_init(struct pcie_port *pp)
> > ret = devm_of_pci_get_host_bridge_resources(dev, 0, 0xff,
> > &bridge->windows, &pp->io_base);
> > if (ret)
> > - return ret;
> > + goto error;
> >
> > ret = devm_request_pci_bus_resources(dev, &bridge->windows);
> > if (ret)
> > @@ -502,6 +502,7 @@ int dw_pcie_host_init(struct pcie_port *pp)
> > return 0;
> >
> > error:
> > + pci_free_resource_list(&bridge->windows);
>
> This would cause a double-free, devm_request_pci_bus_resource already
> takes care of freeing resources, patch dropped.
Yes, I just understood.
> Lorenzo
>
> > pci_free_host_bridge(bridge);
> > return ret;
> > }
> > --
> > 2.17.1
> >
Thanks,
Zhiqiang
next prev parent reply other threads:[~2018-12-06 1:09 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-07 10:08 [PATCHv2 0/4] PCI: dwc: add prefetchable memory range support Z.q. Hou
2018-11-07 10:09 ` [PATCHv2 1/4] PCI: dwc: fix potential memory leak Z.q. Hou
2018-12-05 15:40 ` Lorenzo Pieralisi
2018-12-06 1:08 ` Z.q. Hou [this message]
2018-11-07 10:09 ` [PATCHv2 2/4] PCI: dwc: fix 4GiB outbound window size truncated to zero issue Z.q. Hou
2018-12-05 16:01 ` Lorenzo Pieralisi
2018-12-06 1:25 ` Z.q. Hou
2018-12-11 14:40 ` Lorenzo Pieralisi
2018-11-07 10:09 ` [PATCHv2 3/4] PCI: layerscape: initialize the number of viewport Z.q. Hou
2018-11-22 11:16 ` Lorenzo Pieralisi
2018-11-23 6:01 ` Z.q. Hou
2018-11-07 10:09 ` [PATCHv2 4/4] PCI: dwc: add prefetchable memory range support Z.q. Hou
2018-11-21 17:36 ` Gustavo Pimentel
2018-11-22 1:03 ` Z.q. Hou
2018-11-28 17:59 ` Lorenzo Pieralisi
2018-12-11 10:21 ` Z.q. Hou
2018-12-11 15:19 ` Lorenzo Pieralisi
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