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Message-Id: <20210315135511.464881720@linuxfoundation.org>
Date: Mon, 15 Mar 2021 14:52:56 +0100
From: gregkh@...uxfoundation.org
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Wang Qing <wangqing@...o.com>,
Tony Krowiak <akrowiak@...ux.ibm.com>,
Heiko Carstens <hca@...ux.ibm.com>
Subject: [PATCH 5.11 113/306] s390/crypto: return -EFAULT if copy_to_user() fails
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
From: Wang Qing <wangqing@...o.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@...o.com>
Reviewed-by: Tony Krowiak <akrowiak@...ux.ibm.com>
Signed-off-by: Heiko Carstens <hca@...ux.ibm.com>
Link: https://lore.kernel.org/r/1614600502-16714-1-git-send-email-wangqing@vivo.com
Signed-off-by: Heiko Carstens <hca@...ux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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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