| Message ID | b411af88-5049-a1c6-83ac-d104a1f429be@huawei.com (mailing list archive) |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
| Series | [v2] ACPI / hotplug / PCI: fix memory leak in enable_slot() | expand |
On Thu, Mar 25, 2021 at 8:27 AM Zhiqiang Liu <liuzhiqiang26@huawei.com> wrote: > > From: Feilong Lin <linfeilong@huawei.com> > > In enable_slot() in drivers/pci/hotplug/acpiphp_glue.c, if pci_get_slot() > will return NULL, we will do not set SLOT_ENABLED flag of slot. if one > device is found by calling pci_get_slot(), its reference count will be > increased. In this case, we did not call pci_dev_put() to decrement the > its reference count, the memory of the device (struct pci_dev type) will > leak. > > Fix it by calling pci_dev_put() to decrement its reference count after that > pci_get_slot() returns a PCI device. > > Signed-off-by: Feilong Lin <linfeilong@huawei.com> > Signed-off-by: Zhiqiang Liu <liuzhiqiang26@huawei.com> > -- > v2: rewrite subject and commit log as suggested by Bjorn Helgaas. The fix is correct AFAICS, so Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Bjorn, has this been applied already? If not, do you want me to take it or are you going to queue it up yourself? > --- > drivers/pci/hotplug/acpiphp_glue.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c > index 3365c93abf0e..f031302ad401 100644 > --- a/drivers/pci/hotplug/acpiphp_glue.c > +++ b/drivers/pci/hotplug/acpiphp_glue.c > @@ -533,6 +533,7 @@ static void enable_slot(struct acpiphp_slot *slot, bool bridge) > slot->flags &= ~SLOT_ENABLED; > continue; > } > + pci_dev_put(dev); > } > } > > -- > 2.19.1 >
On Thu, Apr 08, 2021 at 05:18:46PM +0200, Rafael J. Wysocki wrote: > On Thu, Mar 25, 2021 at 8:27 AM Zhiqiang Liu <liuzhiqiang26@huawei.com> wrote: > > > > From: Feilong Lin <linfeilong@huawei.com> > > > > In enable_slot() in drivers/pci/hotplug/acpiphp_glue.c, if pci_get_slot() > > will return NULL, we will do not set SLOT_ENABLED flag of slot. if one > > device is found by calling pci_get_slot(), its reference count will be > > increased. In this case, we did not call pci_dev_put() to decrement the > > its reference count, the memory of the device (struct pci_dev type) will > > leak. > > > > Fix it by calling pci_dev_put() to decrement its reference count after that > > pci_get_slot() returns a PCI device. > > > > Signed-off-by: Feilong Lin <linfeilong@huawei.com> > > Signed-off-by: Zhiqiang Liu <liuzhiqiang26@huawei.com> > > -- > > v2: rewrite subject and commit log as suggested by Bjorn Helgaas. > > The fix is correct AFAICS, so > > Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > > Bjorn, has this been applied already? If not, do you want me to take > it or are you going to queue it up yourself? I'll pick it up; thanks for the review and the reminder! > > --- > > drivers/pci/hotplug/acpiphp_glue.c | 1 + > > 1 file changed, 1 insertion(+) > > > > diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c > > index 3365c93abf0e..f031302ad401 100644 > > --- a/drivers/pci/hotplug/acpiphp_glue.c > > +++ b/drivers/pci/hotplug/acpiphp_glue.c > > @@ -533,6 +533,7 @@ static void enable_slot(struct acpiphp_slot *slot, bool bridge) > > slot->flags &= ~SLOT_ENABLED; > > continue; > > } > > + pci_dev_put(dev); > > } > > } > > > > -- > > 2.19.1 > >
On Thu, Mar 25, 2021 at 03:26:00PM +0800, Zhiqiang Liu wrote: > From: Feilong Lin <linfeilong@huawei.com> > > In enable_slot() in drivers/pci/hotplug/acpiphp_glue.c, if pci_get_slot() > will return NULL, we will do not set SLOT_ENABLED flag of slot. if one > device is found by calling pci_get_slot(), its reference count will be > increased. In this case, we did not call pci_dev_put() to decrement the > its reference count, the memory of the device (struct pci_dev type) will > leak. > > Fix it by calling pci_dev_put() to decrement its reference count after that > pci_get_slot() returns a PCI device. > > Signed-off-by: Feilong Lin <linfeilong@huawei.com> > Signed-off-by: Zhiqiang Liu <liuzhiqiang26@huawei.com> Applied with Rafael's reviewed-by to pci/hotplug for v5.13, thanks! > -- > v2: rewrite subject and commit log as suggested by Bjorn Helgaas. > --- > drivers/pci/hotplug/acpiphp_glue.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c > index 3365c93abf0e..f031302ad401 100644 > --- a/drivers/pci/hotplug/acpiphp_glue.c > +++ b/drivers/pci/hotplug/acpiphp_glue.c > @@ -533,6 +533,7 @@ static void enable_slot(struct acpiphp_slot *slot, bool bridge) > slot->flags &= ~SLOT_ENABLED; > continue; > } > + pci_dev_put(dev); > } > } > > -- > 2.19.1 >
diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c index 3365c93abf0e..f031302ad401 100644 --- a/drivers/pci/hotplug/acpiphp_glue.c +++ b/drivers/pci/hotplug/acpiphp_glue.c @@ -533,6 +533,7 @@ static void enable_slot(struct acpiphp_slot *slot, bool bridge) slot->flags &= ~SLOT_ENABLED; continue; } + pci_dev_put(dev); } }