| Message ID | 1423630715-23568-1-git-send-email-lorenzo.pieralisi@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
On Wed, Feb 11, 2015 at 04:58:35AM +0000, Lorenzo Pieralisi wrote: > Commit d2be00c0fb5a ("of/pci: Free resources on failure in > of_pci_get_host_bridge_resources()") fixed the error code path in > of_pci_get_host_bridge_resources() by adding code that runs through the > resources list to free all resources in it and then calls kfree on the > bus_range resource pointer to complete the memory deallocation. > Since the bus_range resource is added to the resources list through > pci_add_resource, the resource_list_for_each_entry loop in the error > exit path frees it already and freeing it anew could trigger a double > free, hence this patch removes the superfluos kfree call on the bus_range > resource. > > Fixes: d2be00c0fb5a ("of/pci: Free resources on failure in of_pci_get_host_bridge_resources()") > Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> > Reported-by: Jiang Liu <jiang.liu@linux.intel.com> > Cc: Bjorn Helgaas <bhelgaas@google.com> > Cc: Rafael J. Wysocki <rjw@rjwysocki.net> I applied this to for-linus, and will ask Linus to put it in before v3.20-rc1, thanks! Rafael, I applied d2be00c0fb5a, where the bug originally came from, but I see that you fixed it with 5c493df25a0d and the fix got lost because of an incorrect merge resolution. So if you'd rather take this, just let me know. > --- > drivers/of/of_pci.c | 1 - > 1 file changed, 1 deletion(-) > > diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c > index 110fece..62426d8 100644 > --- a/drivers/of/of_pci.c > +++ b/drivers/of/of_pci.c > @@ -229,7 +229,6 @@ parse_failed: > resource_list_for_each_entry(window, resources) > kfree(window->res); > pci_free_resource_list(resources); > - kfree(bus_range); > return err; > } > EXPORT_SYMBOL_GPL(of_pci_get_host_bridge_resources); > -- > 2.2.1 > -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Wednesday, February 11, 2015 04:50:57 PM Bjorn Helgaas wrote: > On Wed, Feb 11, 2015 at 04:58:35AM +0000, Lorenzo Pieralisi wrote: > > Commit d2be00c0fb5a ("of/pci: Free resources on failure in > > of_pci_get_host_bridge_resources()") fixed the error code path in > > of_pci_get_host_bridge_resources() by adding code that runs through the > > resources list to free all resources in it and then calls kfree on the > > bus_range resource pointer to complete the memory deallocation. > > Since the bus_range resource is added to the resources list through > > pci_add_resource, the resource_list_for_each_entry loop in the error > > exit path frees it already and freeing it anew could trigger a double > > free, hence this patch removes the superfluos kfree call on the bus_range > > resource. > > > > Fixes: d2be00c0fb5a ("of/pci: Free resources on failure in of_pci_get_host_bridge_resources()") > > Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> > > Reported-by: Jiang Liu <jiang.liu@linux.intel.com> > > Cc: Bjorn Helgaas <bhelgaas@google.com> > > Cc: Rafael J. Wysocki <rjw@rjwysocki.net> > > I applied this to for-linus, and will ask Linus to put it in before > v3.20-rc1, thanks! > > Rafael, I applied d2be00c0fb5a, where the bug originally came from, but I > see that you fixed it with 5c493df25a0d and the fix got lost because of an > incorrect merge resolution. So if you'd rather take this, just let me > know. That really should go through your tree I think. I attempted to fix it, but failed to do that correctly, so effectively that doesn't count ... Rafael -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c index 110fece..62426d8 100644 --- a/drivers/of/of_pci.c +++ b/drivers/of/of_pci.c @@ -229,7 +229,6 @@ parse_failed: resource_list_for_each_entry(window, resources) kfree(window->res); pci_free_resource_list(resources); - kfree(bus_range); return err; } EXPORT_SYMBOL_GPL(of_pci_get_host_bridge_resources);
Commit d2be00c0fb5a ("of/pci: Free resources on failure in of_pci_get_host_bridge_resources()") fixed the error code path in of_pci_get_host_bridge_resources() by adding code that runs through the resources list to free all resources in it and then calls kfree on the bus_range resource pointer to complete the memory deallocation. Since the bus_range resource is added to the resources list through pci_add_resource, the resource_list_for_each_entry loop in the error exit path frees it already and freeing it anew could trigger a double free, hence this patch removes the superfluos kfree call on the bus_range resource. Fixes: d2be00c0fb5a ("of/pci: Free resources on failure in of_pci_get_host_bridge_resources()") Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Reported-by: Jiang Liu <jiang.liu@linux.intel.com> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Rafael J. Wysocki <rjw@rjwysocki.net> --- drivers/of/of_pci.c | 1 - 1 file changed, 1 deletion(-)