s390/cio: return -EFAULT if copy_to_user() fails
The copy_to_user() function returns the number of bytes remaining to be
copied, but we want to return -EFAULT if the copy doesn't complete.
Fixes: e01bcdd613
("vfio: ccw: realize VFIO_DEVICE_GET_REGION_INFO ioctl")
Signed-off-by: Wang Qing <wangqing@vivo.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Link: https://lore.kernel.org/r/1614600093-13992-1-git-send-email-wangqing@vivo.com
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
parent
46b635b6ab
commit
51c44babdc
drivers/s390/cio
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@ -543,7 +543,7 @@ static ssize_t vfio_ccw_mdev_ioctl(struct mdev_device *mdev,
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if (ret)
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if (ret)
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return ret;
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return ret;
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return copy_to_user((void __user *)arg, &info, minsz);
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return copy_to_user((void __user *)arg, &info, minsz) ? -EFAULT : 0;
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}
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}
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case VFIO_DEVICE_GET_REGION_INFO:
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case VFIO_DEVICE_GET_REGION_INFO:
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{
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{
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@ -561,7 +561,7 @@ static ssize_t vfio_ccw_mdev_ioctl(struct mdev_device *mdev,
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if (ret)
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if (ret)
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return ret;
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return ret;
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return copy_to_user((void __user *)arg, &info, minsz);
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return copy_to_user((void __user *)arg, &info, minsz) ? -EFAULT : 0;
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}
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}
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case VFIO_DEVICE_GET_IRQ_INFO:
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case VFIO_DEVICE_GET_IRQ_INFO:
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{
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{
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