This is a note to let you know that I've just added the patch titled
s390/crypto: return -EFAULT if copy_to_user() fails
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
s390-crypto-return-efault-if-copy_to_user-fails.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 942df4be7ab40195e2a839e9de81951a5862bc5b Mon Sep 17 00:00:00 2001
From: Wang Qing <wangqing@xxxxxxxx>
Date: Mon, 1 Mar 2021 20:08:21 +0800
Subject: s390/crypto: return -EFAULT if copy_to_user() fails
From: Wang Qing <wangqing@xxxxxxxx>
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@xxxxxxxx>
Reviewed-by: Tony Krowiak <akrowiak@xxxxxxxxxxxxx>
Signed-off-by: Heiko Carstens <hca@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/1614600502-16714-1-git-send-email-wangqing@xxxxxxxx
Signed-off-by: Heiko Carstens <hca@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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
@@ -1279,7 +1279,7 @@ 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,
Patches currently in stable-queue which might be from wangqing@xxxxxxxx are
queue-5.4/s390-crypto-return-efault-if-copy_to_user-fails.patch
queue-5.4/s390-cio-return-efault-if-copy_to_user-fails.patch
