This is a note to let you know that I've just added the patch titled
virtio-mmio: don't break lifecycle of vm_dev
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
virtio-mmio-don-t-break-lifecycle-of-vm_dev.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit a0fbedeefbd12ac6a8b6d1877f5f728bd21286b1
Author: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
Date: Thu Jun 29 14:05:26 2023 +0200
virtio-mmio: don't break lifecycle of vm_dev
[ Upstream commit 55c91fedd03d7b9cf0c5199b2eb12b9b8e95281a ]
vm_dev has a separate lifecycle because it has a 'struct device'
embedded. Thus, having a release callback for it is correct.
Allocating the vm_dev struct with devres totally breaks this protection,
though. Instead of waiting for the vm_dev release callback, the memory
is freed when the platform_device is removed. Resulting in a
use-after-free when finally the callback is to be called.
To easily see the problem, compile the kernel with
CONFIG_DEBUG_KOBJECT_RELEASE and unbind with sysfs.
The fix is easy, don't use devres in this case.
Found during my research about object lifetime problems.
Fixes: 7eb781b1bbb7 ("virtio_mmio: add cleanup for virtio_mmio_probe")
Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
Message-Id: <20230629120526.7184-1-wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
index d654e8953b6cb..07be3a374efbb 100644
--- a/drivers/virtio/virtio_mmio.c
+++ b/drivers/virtio/virtio_mmio.c
@@ -537,9 +537,8 @@ static void virtio_mmio_release_dev(struct device *_d)
struct virtio_device *vdev =
container_of(_d, struct virtio_device, dev);
struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
- struct platform_device *pdev = vm_dev->pdev;
- devm_kfree(&pdev->dev, vm_dev);
+ kfree(vm_dev);
}
/* Platform device */
@@ -550,7 +549,7 @@ static int virtio_mmio_probe(struct platform_device *pdev)
unsigned long magic;
int rc;
- vm_dev = devm_kzalloc(&pdev->dev, sizeof(*vm_dev), GFP_KERNEL);
+ vm_dev = kzalloc(sizeof(*vm_dev), GFP_KERNEL);
if (!vm_dev)
return -ENOMEM;
