| Message ID | 20170802090307.GA24167@red-moon |
|---|---|
| State | Not Applicable |
| Headers | show |
Hi > -----Original Message----- > From: Lorenzo Pieralisi [mailto:lorenzo.pieralisi@arm.com] > Sent: Wednesday, August 2, 2017 6:03 PM > To: HARUNOBU KUROKAWA <harunobu.kurokawa.dn@renesas.com> > Cc: horms@verge.net.au; bhelgaas@google.com; linux-pci@vger.kernel.org; linux-renesas-soc@vger.kernel.org; > linux-kernel@vger.kernel.org > Subject: Re: [PATCH] PCI: rcar-pcie: Fix memory leak when no PCIe card is inserted > > On Wed, Aug 02, 2017 at 04:13:20PM +0900, Harunobu Kurokawa wrote: > > When no PCIe card is inserted, there is a memory leak as > > pci_free_resource_list is not called before returning. > > > > Signed-off-by: Harunobu Kurokawa <harunobu.kurokawa.dn@renesas.com> > > --- > > drivers/pci/host/pcie-rcar.c | 7 ++++--- > > 1 file changed, 4 insertions(+), 3 deletions(-) > > > > diff --git a/drivers/pci/host/pcie-rcar.c > > b/drivers/pci/host/pcie-rcar.c index ac80fbb..9b06de6 100644 > > --- a/drivers/pci/host/pcie-rcar.c > > +++ b/drivers/pci/host/pcie-rcar.c > > @@ -1190,14 +1190,15 @@ static int rcar_pcie_probe(struct > > platform_device *pdev) > > > > return 0; > > > > -err_free_bridge: > > - pci_free_host_bridge(bridge); > > - > > err_pm_put: > > pm_runtime_put(dev); > > > > err_pm_disable: > > pm_runtime_disable(dev); > > + > > +err_free_bridge: > > + pci_free_host_bridge(bridge); > > + pci_free_resource_list(&pcie->resources); > > return err; > > } > > The error code path needs fixing but not like this (with a single patch lumping all fixes - well, actually it does not - together). > > Step one, patch below. Step two free the &pci->resources list (which IIUC was not freed even before commit 90634e854079) in a separate > patch. > > Am I missing something ? > > Please apply, check and repost the patch if it is ok, thanks. Yes, I'll sprit the patch and repost them. Best regards, Kurokawa. > > -- >8 -- > Subject: [PATCH] PCI: rcar: Fix error exit path > > Commit 90634e854079 ("PCI: rcar: Convert PCI scan API to > pci_scan_root_bus_bridge()") converted PCI root bus scan API to the new pci_scan_root_bus_bridge() API; in the process some error > paths were not updated correctly which may cause memory leaks. > > Fix the driver error exit path reinstating the previous correct error exit behaviour. > > Fixes: 90634e854079 ("PCI: rcar: Convert PCI scan API to pci_scan_root_bus_bridge()") > Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> > --- > drivers/pci/host/pcie-rcar.c | 11 +++++------ > 1 file changed, 5 insertions(+), 6 deletions(-) > > diff --git a/drivers/pci/host/pcie-rcar.c b/drivers/pci/host/pcie-rcar.c index 246d485..007523e 100644 > --- a/drivers/pci/host/pcie-rcar.c > +++ b/drivers/pci/host/pcie-rcar.c > @@ -471,10 +471,8 @@ static int rcar_pcie_enable(struct rcar_pcie *pcie) > bridge->msi = &pcie->msi.chip; > > ret = pci_scan_root_bus_bridge(bridge); > - if (ret < 0) { > - kfree(bridge); > + if (ret < 0) > return ret; > - } > > bus = bridge->bus; > > @@ -1190,14 +1188,15 @@ static int rcar_pcie_probe(struct platform_device *pdev) > > return 0; > > -err_free_bridge: > - pci_free_host_bridge(bridge); > - > err_pm_put: > pm_runtime_put(dev); > > err_pm_disable: > pm_runtime_disable(dev); > + > +err_free_bridge: > + pci_free_host_bridge(bridge); > + > return err; > } > > -- > 2.10.0
diff --git a/drivers/pci/host/pcie-rcar.c b/drivers/pci/host/pcie-rcar.c index 246d485..007523e 100644 --- a/drivers/pci/host/pcie-rcar.c +++ b/drivers/pci/host/pcie-rcar.c @@ -471,10 +471,8 @@ static int rcar_pcie_enable(struct rcar_pcie *pcie) bridge->msi = &pcie->msi.chip; ret = pci_scan_root_bus_bridge(bridge); - if (ret < 0) { - kfree(bridge); + if (ret < 0) return ret; - } bus = bridge->bus; @@ -1190,14 +1188,15 @@ static int rcar_pcie_probe(struct platform_device *pdev) return 0; -err_free_bridge: - pci_free_host_bridge(bridge); - err_pm_put: pm_runtime_put(dev); err_pm_disable: pm_runtime_disable(dev); + +err_free_bridge: + pci_free_host_bridge(bridge); + return err; }