* FAILED: patch "[PATCH] PCI: hv: Fix a memory leak in hv_eject_device_work()" failed to apply to 4.9-stable tree
@ 2019-05-15 8:34 gregkh
2019-05-15 23:14 ` Dexuan Cui
0 siblings, 1 reply; 3+ messages in thread
From: gregkh @ 2019-05-15 8:34 UTC (permalink / raw)
To: decui, lorenzo.pieralisi, mikelley, stephen; +Cc: stable
The patch below does not apply to the 4.9-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 05f151a73ec2b23ffbff706e5203e729a995cdc2 Mon Sep 17 00:00:00 2001
From: Dexuan Cui <decui@microsoft.com>
Date: Mon, 4 Mar 2019 21:34:48 +0000
Subject: [PATCH] PCI: hv: Fix a memory leak in hv_eject_device_work()
When a device is created in new_pcichild_device(), hpdev->refs is set
to 2 (i.e. the initial value of 1 plus the get_pcichild()).
When we hot remove the device from the host, in a Linux VM we first call
hv_pci_eject_device(), which increases hpdev->refs by get_pcichild() and
then schedules a work of hv_eject_device_work(), so hpdev->refs becomes
3 (let's ignore the paired get/put_pcichild() in other places). But in
hv_eject_device_work(), currently we only call put_pcichild() twice,
meaning the 'hpdev' struct can't be freed in put_pcichild().
Add one put_pcichild() to fix the memory leak.
The device can also be removed when we run "rmmod pci-hyperv". On this
path (hv_pci_remove() -> hv_pci_bus_exit() -> hv_pci_devices_present()),
hpdev->refs is 2, and we do correctly call put_pcichild() twice in
pci_devices_present_work().
Fixes: 4daace0d8ce8 ("PCI: hv: Add paravirtual PCI front-end for Microsoft Hyper-V VMs")
Signed-off-by: Dexuan Cui <decui@microsoft.com>
[lorenzo.pieralisi@arm.com: commit log rework]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Stephen Hemminger <stephen@networkplumber.org>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Cc: stable@vger.kernel.org
diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c
index 95441a35eceb..30f16b882746 100644
--- a/drivers/pci/controller/pci-hyperv.c
+++ b/drivers/pci/controller/pci-hyperv.c
@@ -1900,6 +1900,9 @@ static void hv_eject_device_work(struct work_struct *work)
sizeof(*ejct_pkt), (unsigned long)&ctxt.pkt,
VM_PKT_DATA_INBAND, 0);
+ /* For the get_pcichild() in hv_pci_eject_device() */
+ put_pcichild(hpdev);
+ /* For the two refs got in new_pcichild_device() */
put_pcichild(hpdev);
put_pcichild(hpdev);
put_hvpcibus(hpdev->hbus);
^ permalink raw reply related [flat|nested] 3+ messages in thread
* RE: FAILED: patch "[PATCH] PCI: hv: Fix a memory leak in hv_eject_device_work()" failed to apply to 4.9-stable tree
2019-05-15 8:34 FAILED: patch "[PATCH] PCI: hv: Fix a memory leak in hv_eject_device_work()" failed to apply to 4.9-stable tree gregkh
@ 2019-05-15 23:14 ` Dexuan Cui
2019-05-17 0:43 ` Sasha Levin
0 siblings, 1 reply; 3+ messages in thread
From: Dexuan Cui @ 2019-05-15 23:14 UTC (permalink / raw)
To: gregkh, lorenzo.pieralisi, Michael Kelley, stephen; +Cc: stable
[-- Attachment #1: Type: text/plain, Size: 3032 bytes --]
> From: gregkh@linuxfoundation.org <gregkh@linuxfoundation.org>
> Sent: Wednesday, May 15, 2019 1:35 AM
> To: Dexuan Cui <decui@microsoft.com>; lorenzo.pieralisi@arm.com; Michael
> Kelley <mikelley@microsoft.com>; stephen@networkplumber.org
> Cc: stable@vger.kernel.org
> Subject: FAILED: patch "[PATCH] PCI: hv: Fix a memory leak in
> hv_eject_device_work()" failed to apply to 4.9-stable tree
>
>
> The patch below does not apply to the 4.9-stable tree.
> If someone wants it applied there, or to any other stable or longterm
> tree, then please email the backport, including the original git commit
> id to <stable@vger.kernel.org>.
>
> thanks,
>
> greg k-h
>
> ------------------ original commit in Linus's tree ------------------
>
> From 05f151a73ec2b23ffbff706e5203e729a995cdc2 Mon Sep 17 00:00:00
> 2001
> From: Dexuan Cui <decui@microsoft.com>
> Date: Mon, 4 Mar 2019 21:34:48 +0000
> Subject: [PATCH] PCI: hv: Fix a memory leak in hv_eject_device_work()
>
> When a device is created in new_pcichild_device(), hpdev->refs is set
> to 2 (i.e. the initial value of 1 plus the get_pcichild()).
>
> When we hot remove the device from the host, in a Linux VM we first call
> hv_pci_eject_device(), which increases hpdev->refs by get_pcichild() and
> then schedules a work of hv_eject_device_work(), so hpdev->refs becomes
> 3 (let's ignore the paired get/put_pcichild() in other places). But in
> hv_eject_device_work(), currently we only call put_pcichild() twice,
> meaning the 'hpdev' struct can't be freed in put_pcichild().
>
> Add one put_pcichild() to fix the memory leak.
>
> The device can also be removed when we run "rmmod pci-hyperv". On this
> path (hv_pci_remove() -> hv_pci_bus_exit() -> hv_pci_devices_present()),
> hpdev->refs is 2, and we do correctly call put_pcichild() twice in
> pci_devices_present_work().
>
> Fixes: 4daace0d8ce8 ("PCI: hv: Add paravirtual PCI front-end for Microsoft
> Hyper-V VMs")
> Signed-off-by: Dexuan Cui <decui@microsoft.com>
> [lorenzo.pieralisi@arm.com: commit log rework]
> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> Reviewed-by: Stephen Hemminger <stephen@networkplumber.org>
> Reviewed-by: Michael Kelley <mikelley@microsoft.com>
> Cc: stable@vger.kernel.org
>
> diff --git a/drivers/pci/controller/pci-hyperv.c
> b/drivers/pci/controller/pci-hyperv.c
> index 95441a35eceb..30f16b882746 100644
> --- a/drivers/pci/controller/pci-hyperv.c
> +++ b/drivers/pci/controller/pci-hyperv.c
> @@ -1900,6 +1900,9 @@ static void hv_eject_device_work(struct work_struct
> *work)
> sizeof(*ejct_pkt), (unsigned long)&ctxt.pkt,
> VM_PKT_DATA_INBAND, 0);
>
> + /* For the get_pcichild() in hv_pci_eject_device() */
> + put_pcichild(hpdev);
> + /* For the two refs got in new_pcichild_device() */
> put_pcichild(hpdev);
> put_pcichild(hpdev);
> put_hvpcibus(hpdev->hbus);
Hi,
I backported the patch for linux-4.9.y. Please use the attached patch.
Thanks,
-- Dexuan
[-- Attachment #2: For-linux-4.9.y_v4.9.176_PCI-hv-Fix-a-memory-leak-in-hv_eject_device_work.patch --]
[-- Type: application/octet-stream, Size: 1004 bytes --]
From 151f2bc2afcc71ddba7b1978cb736cf13c4eeff0 Mon Sep 17 00:00:00 2001
From: Dexuan Cui <decui@microsoft.com>
Date: Wed, 15 May 2019 15:42:07 -0700
Subject: [PATCH][For v4.9.176] PCI: hv: Fix a memory leak in hv_eject_device_work()
This patch is backported for v4.9.176 from the mainline
commit 05f151a73ec2 ("PCI: hv: Fix a memory leak in hv_eject_device_work()")
Signed-off-by: Dexuan Cui <decui@microsoft.com>
---
drivers/pci/host/pci-hyperv.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/pci/host/pci-hyperv.c b/drivers/pci/host/pci-hyperv.c
index b4d8ccfd9f7c..200b41576526 100644
--- a/drivers/pci/host/pci-hyperv.c
+++ b/drivers/pci/host/pci-hyperv.c
@@ -1620,6 +1620,7 @@ static void hv_eject_device_work(struct work_struct *work)
spin_unlock_irqrestore(&hpdev->hbus->device_list_lock, flags);
put_pcichild(hpdev, hv_pcidev_ref_childlist);
+ put_pcichild(hpdev, hv_pcidev_ref_initial);
put_pcichild(hpdev, hv_pcidev_ref_pnp);
put_hvpcibus(hpdev->hbus);
}
--
2.17.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: FAILED: patch "[PATCH] PCI: hv: Fix a memory leak in hv_eject_device_work()" failed to apply to 4.9-stable tree
2019-05-15 23:14 ` Dexuan Cui
@ 2019-05-17 0:43 ` Sasha Levin
0 siblings, 0 replies; 3+ messages in thread
From: Sasha Levin @ 2019-05-17 0:43 UTC (permalink / raw)
To: Dexuan Cui; +Cc: gregkh, lorenzo.pieralisi, Michael Kelley, stephen, stable
On Wed, May 15, 2019 at 11:14:31PM +0000, Dexuan Cui wrote:
>> From: gregkh@linuxfoundation.org <gregkh@linuxfoundation.org>
>> Sent: Wednesday, May 15, 2019 1:35 AM
>> To: Dexuan Cui <decui@microsoft.com>; lorenzo.pieralisi@arm.com; Michael
>> Kelley <mikelley@microsoft.com>; stephen@networkplumber.org
>> Cc: stable@vger.kernel.org
>> Subject: FAILED: patch "[PATCH] PCI: hv: Fix a memory leak in
>> hv_eject_device_work()" failed to apply to 4.9-stable tree
>>
>>
>> The patch below does not apply to the 4.9-stable tree.
>> If someone wants it applied there, or to any other stable or longterm
>> tree, then please email the backport, including the original git commit
>> id to <stable@vger.kernel.org>.
>>
>> thanks,
>>
>> greg k-h
>>
>> ------------------ original commit in Linus's tree ------------------
>>
>> From 05f151a73ec2b23ffbff706e5203e729a995cdc2 Mon Sep 17 00:00:00
>> 2001
>> From: Dexuan Cui <decui@microsoft.com>
>> Date: Mon, 4 Mar 2019 21:34:48 +0000
>> Subject: [PATCH] PCI: hv: Fix a memory leak in hv_eject_device_work()
>>
>> When a device is created in new_pcichild_device(), hpdev->refs is set
>> to 2 (i.e. the initial value of 1 plus the get_pcichild()).
>>
>> When we hot remove the device from the host, in a Linux VM we first call
>> hv_pci_eject_device(), which increases hpdev->refs by get_pcichild() and
>> then schedules a work of hv_eject_device_work(), so hpdev->refs becomes
>> 3 (let's ignore the paired get/put_pcichild() in other places). But in
>> hv_eject_device_work(), currently we only call put_pcichild() twice,
>> meaning the 'hpdev' struct can't be freed in put_pcichild().
>>
>> Add one put_pcichild() to fix the memory leak.
>>
>> The device can also be removed when we run "rmmod pci-hyperv". On this
>> path (hv_pci_remove() -> hv_pci_bus_exit() -> hv_pci_devices_present()),
>> hpdev->refs is 2, and we do correctly call put_pcichild() twice in
>> pci_devices_present_work().
>>
>> Fixes: 4daace0d8ce8 ("PCI: hv: Add paravirtual PCI front-end for Microsoft
>> Hyper-V VMs")
>> Signed-off-by: Dexuan Cui <decui@microsoft.com>
>> [lorenzo.pieralisi@arm.com: commit log rework]
>> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
>> Reviewed-by: Stephen Hemminger <stephen@networkplumber.org>
>> Reviewed-by: Michael Kelley <mikelley@microsoft.com>
>> Cc: stable@vger.kernel.org
>>
>> diff --git a/drivers/pci/controller/pci-hyperv.c
>> b/drivers/pci/controller/pci-hyperv.c
>> index 95441a35eceb..30f16b882746 100644
>> --- a/drivers/pci/controller/pci-hyperv.c
>> +++ b/drivers/pci/controller/pci-hyperv.c
>> @@ -1900,6 +1900,9 @@ static void hv_eject_device_work(struct work_struct
>> *work)
>> sizeof(*ejct_pkt), (unsigned long)&ctxt.pkt,
>> VM_PKT_DATA_INBAND, 0);
>>
>> + /* For the get_pcichild() in hv_pci_eject_device() */
>> + put_pcichild(hpdev);
>> + /* For the two refs got in new_pcichild_device() */
>> put_pcichild(hpdev);
>> put_pcichild(hpdev);
>> put_hvpcibus(hpdev->hbus);
>
>Hi,
>I backported the patch for linux-4.9.y. Please use the attached patch.
>
>Thanks,
>-- Dexuan
Queued for 4.9, thanks.
--
Thanks,
Sasha
^ permalink raw reply [flat|nested] 3+ messages in thread
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2019-05-15 8:34 FAILED: patch "[PATCH] PCI: hv: Fix a memory leak in hv_eject_device_work()" failed to apply to 4.9-stable tree gregkh
2019-05-15 23:14 ` Dexuan Cui
2019-05-17 0:43 ` Sasha Levin
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