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authorAl Viro <viro@zeniv.linux.org.uk>2012-08-17 23:54:15 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2012-09-26 21:08:49 -0400
commit28407630513b1a86133db0ef8b39fabad6c494af (patch)
treee7b44dc7d4690eb9f66dab7042a66fe04af2e61b /net/socket.c
parent5905db5ca0ac9a6d5bfe87f86b87cd1bdec3755a (diff)
downloadlinux-28407630513b1a86133db0ef8b39fabad6c494af.tar.gz
take descriptor handling from sock_alloc_file() to callers
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'net/socket.c')
-rw-r--r--net/socket.c62
1 files changed, 40 insertions, 22 deletions
diff --git a/net/socket.c b/net/socket.c
index edc3c4af908..a14ec19164b 100644
--- 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)