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* [patch 1/3] vfio-mdev: return -EFAULT if copy_to_user() fails
@ 2017-01-07  6:27 Dan Carpenter
  2017-01-09 18:49 ` Kirti Wankhede
  0 siblings, 1 reply; 3+ messages in thread
From: Dan Carpenter @ 2017-01-07  6:27 UTC (permalink / raw)
  To: Kirti Wankhede; +Cc: kvm, kernel-janitors

The copy_to_user() function returns the number of bytes which it wasn't
able to copy but we want to return a negative error code.

Fixes: 9d1a546c53b4 ("docs: Sample driver to demonstrate how to use Mediated device framework.")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

diff --git a/samples/vfio-mdev/mtty.c b/samples/vfio-mdev/mtty.c
index 919c10d5b12e..d2656ff569c1 100644
--- a/samples/vfio-mdev/mtty.c
+++ b/samples/vfio-mdev/mtty.c
@@ -1180,7 +1180,10 @@ static long mtty_ioctl(struct mdev_device *mdev, unsigned int cmd,
 
 		memcpy(&mdev_state->dev_info, &info, sizeof(info));
 
-		return copy_to_user((void __user *)arg, &info, minsz);
+		if (copy_to_user((void __user *)arg, &info, minsz))
+			return -EFAULT;
+
+		return 0;
 	}
 	case VFIO_DEVICE_GET_REGION_INFO:
 	{
@@ -1201,7 +1204,10 @@ static long mtty_ioctl(struct mdev_device *mdev, unsigned int cmd,
 		if (ret)
 			return ret;
 
-		return copy_to_user((void __user *)arg, &info, minsz);
+		if (copy_to_user((void __user *)arg, &info, minsz))
+			return -EFAULT;
+
+		return 0;
 	}
 
 	case VFIO_DEVICE_GET_IRQ_INFO:
@@ -1224,7 +1230,10 @@ static long mtty_ioctl(struct mdev_device *mdev, unsigned int cmd,
 		if (info.count = -1)
 			return -EINVAL;
 
-		return copy_to_user((void __user *)arg, &info, minsz);
+		if (copy_to_user((void __user *)arg, &info, minsz))
+			return -EFAULT;
+
+		return 0;
 	}
 	case VFIO_DEVICE_SET_IRQS:
 	{

^ permalink raw reply related	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2017-01-11 19:15 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz follow: Atom feed
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2017-01-07  6:27 [patch 1/3] vfio-mdev: return -EFAULT if copy_to_user() fails Dan Carpenter
2017-01-09 18:49 ` Kirti Wankhede
2017-01-11 19:15   ` Alex Williamson

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