Thread (1 message) 1 message, 1 author, 2021-10-13

Re: [PATCH] vduse: Disallow injecting interrupt before DRIVER_OK is set

From: "Michael S. Tsirkin" <mst@redhat.com>
Date: 2021-10-13 11:27:00

On Thu, Sep 23, 2021 at 03:57:22PM +0800, Xie Yongji wrote:
The interrupt callback should not be triggered before DRIVER_OK
is set. Otherwise, it might break the virtio device driver.
So let's add a check to avoid the unexpected behavior.

Fixes: c8a6153b6c59 ("vduse: Introduce VDUSE - vDPA Device in Userspace")
Signed-off-by: Xie Yongji <redacted>
OK I guess, except - what about locking/ordering in all this?
quoted hunk
---
 drivers/vdpa/vdpa_user/vduse_dev.c | 8 ++++++++
 1 file changed, 8 insertions(+)
diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c
index 29a38ecba19e..972c13a7e5da 100644
--- a/drivers/vdpa/vdpa_user/vduse_dev.c
+++ b/drivers/vdpa/vdpa_user/vduse_dev.c
@@ -968,6 +968,10 @@ static long vduse_dev_ioctl(struct file *file, unsigned int cmd,
 		break;
 	}
 	case VDUSE_DEV_INJECT_CONFIG_IRQ:
+		ret = -EINVAL;
+		if (!(dev->status & VIRTIO_CONFIG_S_DRIVER_OK))
+			break;
+
 		ret = 0;
 		queue_work(vduse_irq_wq, &dev->inject);
 		break;
@@ -1047,6 +1051,10 @@ static long vduse_dev_ioctl(struct file *file, unsigned int cmd,
 	case VDUSE_VQ_INJECT_IRQ: {
 		u32 index;
 
+		ret = -EINVAL;
+		if (!(dev->status & VIRTIO_CONFIG_S_DRIVER_OK))
+			break;
+
 		ret = -EFAULT;
 		if (get_user(index, (u32 __user *)argp))
 			break;
-- 
2.11.0
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