| From | gregkh@linuxfou ... | Subject | [PATCH 5.11 113/306] s390/crypto: return -EFAULT if copy_to_user() fails | Date | Mon, 15 Mar 2021 14:52:56 +0100 |
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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
From: Wang Qing <wangqing@vivo.com>
commit 942df4be7ab40195e2a839e9de81951a5862bc5b upstream.
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: e06670c5fe3b ("s390: vfio-ap: implement VFIO_DEVICE_GET_INFO ioctl") Signed-off-by: Wang Qing <wangqing@vivo.com> Reviewed-by: Tony Krowiak <akrowiak@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Link: https://lore.kernel.org/r/1614600502-16714-1-git-send-email-wangqing@vivo.com Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/s390/crypto/vfio_ap_ops.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/s390/crypto/vfio_ap_ops.c +++ b/drivers/s390/crypto/vfio_ap_ops.c @@ -1286,7 +1286,7 @@ static int vfio_ap_mdev_get_device_info( info.num_regions = 0; info.num_irqs = 0; - return copy_to_user((void __user *)arg, &info, minsz); + return copy_to_user((void __user *)arg, &info, minsz) ? -EFAULT : 0; } static ssize_t vfio_ap_mdev_ioctl(struct mdev_device *mdev,
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