take descriptor handling from sock_alloc_file() to callers

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/net/socket.c b/net/socket.c
index edc3c4a..a14ec19 100644 (file)
--- a/net/socket.c
+++ b/net/socket.c
@@ -346,22 +346,15 @@ static struct file_system_type sock_fs_type = {
  *     but we take care of internal coherence yet.
  */
 
-static int sock_alloc_file(struct socket *sock, struct file **f, int flags)
+static struct file *sock_alloc_file(struct socket *sock, int flags)
 {
        struct qstr name = { .name = "" };
        struct path path;
        struct file *file;
-       int fd;
-
-       fd = get_unused_fd_flags(flags);
-       if (unlikely(fd < 0))
-               return fd;
 
        path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name);
-       if (unlikely(!path.dentry)) {
-               put_unused_fd(fd);
-               return -ENOMEM;
-       }
+       if (unlikely(!path.dentry))
+               return ERR_PTR(-ENOMEM);
        path.mnt = mntget(sock_mnt);
 
        d_instantiate(path.dentry, SOCK_INODE(sock));
@@ -373,28 +366,31 @@ static int sock_alloc_file(struct socket *sock, struct file **f, int flags)
                /* drop dentry, keep inode */
                ihold(path.dentry->d_inode);
                path_put(&path);
-               put_unused_fd(fd);
-               return -ENFILE;
+               return ERR_PTR(-ENFILE);
        }
 
        sock->file = file;
        file->f_flags = O_RDWR | (flags & O_NONBLOCK);
        file->f_pos = 0;
        file->private_data = sock;
-
-       *f = file;
-       return fd;
+       return file;
 }
 
 int sock_map_fd(struct socket *sock, int flags)
 {
        struct file *newfile;
-       int fd = sock_alloc_file(sock, &newfile, flags);
+       int fd = get_unused_fd_flags(flags);
+       if (unlikely(fd < 0))
+               return fd;
 
-       if (likely(fd >= 0))
+       newfile = sock_alloc_file(sock, flags);
+       if (likely(!IS_ERR(newfile))) {
                fd_install(fd, newfile);
+               return fd;
+       }
 
-       return fd;
+       put_unused_fd(fd);
+       return PTR_ERR(newfile);
 }
 EXPORT_SYMBOL(sock_map_fd);
 
@@ -1394,17 +1390,32 @@ SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
        if (err < 0)
                goto out_release_both;
 
-       fd1 = sock_alloc_file(sock1, &newfile1, flags);
+       fd1 = get_unused_fd_flags(flags);
        if (unlikely(fd1 < 0)) {
                err = fd1;
                goto out_release_both;
        }
-
-       fd2 = sock_alloc_file(sock2, &newfile2, flags);
+       fd2 = get_unused_fd_flags(flags);
        if (unlikely(fd2 < 0)) {
                err = fd2;
+               put_unused_fd(fd1);
+               goto out_release_both;
+       }
+
+       newfile1 = sock_alloc_file(sock1, flags);
+       if (unlikely(IS_ERR(newfile1))) {
+               err = PTR_ERR(newfile1);
+               put_unused_fd(fd1);
+               put_unused_fd(fd2);
+               goto out_release_both;
+       }
+
+       newfile2 = sock_alloc_file(sock2, flags);
+       if (IS_ERR(newfile2)) {
+               err = PTR_ERR(newfile2);
                fput(newfile1);
                put_unused_fd(fd1);
+               put_unused_fd(fd2);
                sock_release(sock2);
                goto out;
        }
@@ -1536,12 +1547,19 @@ SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
         */
        __module_get(newsock->ops->owner);
 
-       newfd = sock_alloc_file(newsock, &newfile, flags);
+       newfd = get_unused_fd_flags(flags);
        if (unlikely(newfd < 0)) {
                err = newfd;
                sock_release(newsock);
                goto out_put;
        }
+       newfile = sock_alloc_file(newsock, flags);
+       if (unlikely(IS_ERR(newfile))) {
+               err = PTR_ERR(newfile);
+               put_unused_fd(newfd);
+               sock_release(newsock);
+               goto out_put;
+       }
 
        err = security_socket_accept(sock, newsock);
        if (err)