linux-kernel - [PATCH 5.8 95/99] s390/zcrypt: Fix ZCRYPT_PERDEV

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Message-Id: <20200929105934.426395938@linuxfoundation.org>
Date:   Tue, 29 Sep 2020 13:02:18 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Harald Freudenberger <freude@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>
Subject: [PATCH 5.8 95/99] s390/zcrypt: Fix ZCRYPT_PERDEV_REQCNT ioctl

From: Christian Borntraeger <borntraeger@...ibm.com>

commit f7e80983f0cf470bb82036e73bff4d5a7daf8fc2 upstream.

reqcnt is an u32 pointer but we do copy sizeof(reqcnt) which is the
size of the pointer. This means we only copy 8 byte. Let us copy
the full monty.

Signed-off-by: Christian Borntraeger <borntraeger@...ibm.com>
Cc: Harald Freudenberger <freude@...ux.ibm.com>
Cc: stable@...r.kernel.org
Fixes: af4a72276d49 ("s390/zcrypt: Support up to 256 crypto adapters.")
Reviewed-by: Harald Freudenberger <freude@...ux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@...ux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/s390/crypto/zcrypt_api.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/s390/crypto/zcrypt_api.c
+++ b/drivers/s390/crypto/zcrypt_api.c
@@ -1429,7 +1429,8 @@ static long zcrypt_unlocked_ioctl(struct
 		if (!reqcnt)
 			return -ENOMEM;
 		zcrypt_perdev_reqcnt(reqcnt, AP_DEVICES);
-		if (copy_to_user((int __user *) arg, reqcnt, sizeof(reqcnt)))
+		if (copy_to_user((int __user *) arg, reqcnt,
+				 sizeof(u32) * AP_DEVICES))
 			rc = -EFAULT;
 		kfree(reqcnt);
 		return rc;