linux-kernel - [PATCH v3 1/2] fs/fcntl: f_setown, allow returning error

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Date:   Tue, 13 Jun 2017 13:35:50 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     jlayton@...hat.com
Cc:     linux-kernel@...r.kernel.org, Jiri Slaby <jslaby@...e.cz>,
        Jeff Layton <jlayton@...chiereds.net>,
        "J. Bruce Fields" <bfields@...ldses.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org
Subject: [PATCH v3 1/2] fs/fcntl: f_setown, allow returning error

Allow f_setown to return an error value. We will fail in the next patch
with EINVAL for bad input to f_setown, so tile the path for the later
patch.

Signed-off-by: Jiri Slaby <jslaby@...e.cz>
Reviewed-by: Jeff Layton <jlayton@...hat.com>
Cc: Jeff Layton <jlayton@...chiereds.net>
Cc: "J. Bruce Fields" <bfields@...ldses.org>
Cc: Alexander Viro <viro@...iv.linux.org.uk>
Cc: linux-fsdevel@...r.kernel.org
---
 fs/fcntl.c         | 7 ++++---
 include/linux/fs.h | 2 +-
 net/socket.c       | 3 +--
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/fs/fcntl.c b/fs/fcntl.c
index bbf80344c125..313eba860346 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -109,7 +109,7 @@ void __f_setown(struct file *filp, struct pid *pid, enum pid_type type,
 }
 EXPORT_SYMBOL(__f_setown);
 
-void f_setown(struct file *filp, unsigned long arg, int force)
+int f_setown(struct file *filp, unsigned long arg, int force)
 {
 	enum pid_type type;
 	struct pid *pid;
@@ -123,6 +123,8 @@ void f_setown(struct file *filp, unsigned long arg, int force)
 	pid = find_vpid(who);
 	__f_setown(filp, pid, type, force);
 	rcu_read_unlock();
+
+	return 0;
 }
 EXPORT_SYMBOL(f_setown);
 
@@ -305,8 +307,7 @@ static long do_fcntl(int fd, unsigned int cmd, unsigned long arg,
 		force_successful_syscall_return();
 		break;
 	case F_SETOWN:
-		f_setown(filp, arg, 1);
-		err = 0;
+		err = f_setown(filp, arg, 1);
 		break;
 	case F_GETOWN_EX:
 		err = f_getown_ex(filp, arg);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index ecc301043abf..6dd215a339d4 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1250,7 +1250,7 @@ extern void fasync_free(struct fasync_struct *);
 extern void kill_fasync(struct fasync_struct **, int, int);
 
 extern void __f_setown(struct file *filp, struct pid *, enum pid_type, int force);
-extern void f_setown(struct file *filp, unsigned long arg, int force);
+extern int f_setown(struct file *filp, unsigned long arg, int force);
 extern void f_delown(struct file *filp);
 extern pid_t f_getown(struct file *filp);
 extern int send_sigurg(struct fown_struct *fown);
diff --git a/net/socket.c b/net/socket.c
index 8f9dab330d57..59e902b9df09 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -991,8 +991,7 @@ static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
 			err = -EFAULT;
 			if (get_user(pid, (int __user *)argp))
 				break;
-			f_setown(sock->file, pid, 1);
-			err = 0;
+			err = f_setown(sock->file, pid, 1);
 			break;
 		case FIOGETOWN:
 		case SIOCGPGRP:
-- 
2.13.1