linux-kernel - [PATCH 6/9 next] security/keys: Use iovec_import() instead of import

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Date:   Tue, 15 Sep 2020 14:55:27 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "io-uring@...r.kernel.org" <io-uring@...r.kernel.org>,
        Jens Axboe <axboe@...nel.dk>,
        "David S. Miller" <davem@...emloft.net>,
        Al Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: [PATCH 6/9 next] security/keys: Use iovec_import() instead of
 import_iovec().


iovec_import() has a safer calling convention than import_iovec().

Signed-off-by: David Laight <david.laight@...lab.com>
---
 security/keys/compat.c | 11 +++++------
 security/keys/keyctl.c | 10 +++++-----
 2 files changed, 10 insertions(+), 11 deletions(-)

diff --git a/security/keys/compat.c b/security/keys/compat.c
index 6ee9d8f6a4a5..c8b6cc77028b 100644
--- a/security/keys/compat.c
+++ b/security/keys/compat.c
@@ -26,18 +26,17 @@ static long compat_keyctl_instantiate_key_iov(
 	unsigned ioc,
 	key_serial_t ringid)
 {
-	struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
+	struct iovec_cache cache;
 	struct iov_iter from;
+	struct iovec *iov;
 	long ret;
 
 	if (!_payload_iov)
 		ioc = 0;
 
-	ret = compat_import_iovec(WRITE, _payload_iov, ioc,
-				  ARRAY_SIZE(iovstack), &iov,
-				  &from);
-	if (ret < 0)
-		return ret;
+	iov = compat_iovec_import(WRITE, _payload_iov, ioc, &cache, &from);
+	if (IS_ERR(iov))
+		return PTR_ERR(iov);
 
 	ret = keyctl_instantiate_key_common(id, &from, ringid);
 	kfree(iov);
diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
index 9febd37a168f..9a90b89ef24b 100644
--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -1276,17 +1276,17 @@ long keyctl_instantiate_key_iov(key_serial_t id,
 				unsigned ioc,
 				key_serial_t ringid)
 {
-	struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
+	struct iovec_cache cache;
 	struct iov_iter from;
+	struct iovec *iov;
 	long ret;
 
 	if (!_payload_iov)
 		ioc = 0;
 
-	ret = import_iovec(WRITE, _payload_iov, ioc,
-				    ARRAY_SIZE(iovstack), &iov, &from);
-	if (ret < 0)
-		return ret;
+	iov = iovec_import(WRITE, _payload_iov, ioc, &cache, &from);
+	if (IS_ERR(iov))
+		return PTR_ERR(iov);
 	ret = keyctl_instantiate_key_common(id, &from, ringid);
 	kfree(iov);
 	return ret;
-- 
2.25.1

-
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