From: Harald Freudenberger <freude@linux.ibm.com>
Date: Fri, 31 Jan 2020 12:08:31 +0100
Subject: s390/pkey: fix missing length of protected key on return
Git-commit: aab73d278d49c718b722ff5052e16c9cddf144d4
Patch-mainline: v5.6-rc2
References: git-fixes

The pkey ioctl call PKEY_SEC2PROTK updates a struct pkey_protkey
on return. The protected key is stored in, the protected key type
is stored in but the len information was not updated. This patch
now fixes this and so the len field gets an update to refrect
the actual size of the protected key value returned.

Fixes: efc598e6c8a9 ("s390/zcrypt: move cca misc functions to new code file")
Cc: Stable <stable@vger.kernel.org>
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Reported-by: Christian Rund <RUNDC@de.ibm.com>
Suggested-by: Ingo Franzki <ifranzki@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/s390/crypto/pkey_api.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/s390/crypto/pkey_api.c
+++ b/drivers/s390/crypto/pkey_api.c
@@ -794,7 +794,7 @@ static long pkey_unlocked_ioctl(struct f
 			return -EFAULT;
 		rc = cca_sec2protkey(ksp.cardnr, ksp.domain,
 				     ksp.seckey.seckey, ksp.protkey.protkey,
-				     NULL, &ksp.protkey.type);
+				     &ksp.protkey.len, &ksp.protkey.type);
 		DEBUG_DBG("%s cca_sec2protkey()=%d\n", __func__, rc);
 		if (rc)
 			break;