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| author | Dan Carpenter <dan.carpenter@oracle.com> | 2017-01-07 09:27:49 +0300 |
|---|---|---|
| committer | Alex Williamson <alex.williamson@redhat.com> | 2017-01-11 12:06:35 -0700 |
| commit | 6ed0993a0b859ce62edf2930ded683e452286d39 (patch) | |
| tree | d887337ec8e4b492163467fc95ef5672d35160aa /samples | |
| parent | a121103c922847ba5010819a3f250f1f7fc84ab8 (diff) | |
| download | lwn-6ed0993a0b859ce62edf2930ded683e452286d39.tar.gz lwn-6ed0993a0b859ce62edf2930ded683e452286d39.zip | |
vfio-mdev: return -EFAULT if copy_to_user() fails
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>
Reviewed-by: Kirti Wankhede <kwankhede@nvidia.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'samples')
| -rw-r--r-- | samples/vfio-mdev/mtty.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/samples/vfio-mdev/mtty.c b/samples/vfio-mdev/mtty.c index 1fc57a5093a7..975af5bbf28d 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: { |