net: Remove the err argument from sock_from_file
Currently, the sock_from_file prototype takes an "err" pointer that is
either not set or set to -ENOTSOCK IFF the returned socket is NULL. This
makes the error redundant and it is ignored by a few callers.
This patch simplifies the API by letting callers deduce the error based
on whether the returned socket is NULL or not.
Suggested-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Florent Revest <revest@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: KP Singh <kpsingh@google.com>
Link: https://lore.kernel.org/bpf/20201204113609.1850150-1-revest@google.com
diff --git a/net/socket.c b/net/socket.c
index bfef11b..9a240b4 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -445,17 +445,15 @@ static int sock_map_fd(struct socket *sock, int flags)
/**
* sock_from_file - Return the &socket bounded to @file.
* @file: file
- * @err: pointer to an error code return
*
- * On failure returns %NULL and assigns -ENOTSOCK to @err.
+ * On failure returns %NULL.
*/
-struct socket *sock_from_file(struct file *file, int *err)
+struct socket *sock_from_file(struct file *file)
{
if (file->f_op == &socket_file_ops)
return file->private_data; /* set in sock_map_fd */
- *err = -ENOTSOCK;
return NULL;
}
EXPORT_SYMBOL(sock_from_file);
@@ -484,9 +482,11 @@ struct socket *sockfd_lookup(int fd, int *err)
return NULL;
}
- sock = sock_from_file(file, err);
- if (!sock)
+ sock = sock_from_file(file);
+ if (!sock) {
+ *err = -ENOTSOCK;
fput(file);
+ }
return sock;
}
EXPORT_SYMBOL(sockfd_lookup);
@@ -498,11 +498,12 @@ static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
*err = -EBADF;
if (f.file) {
- sock = sock_from_file(f.file, err);
+ sock = sock_from_file(f.file);
if (likely(sock)) {
*fput_needed = f.flags & FDPUT_FPUT;
return sock;
}
+ *err = -ENOTSOCK;
fdput(f);
}
return NULL;
@@ -1693,9 +1694,11 @@ int __sys_accept4_file(struct file *file, unsigned file_flags,
if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
- sock = sock_from_file(file, &err);
- if (!sock)
+ sock = sock_from_file(file);
+ if (!sock) {
+ err = -ENOTSOCK;
goto out;
+ }
err = -ENFILE;
newsock = sock_alloc();
@@ -1818,9 +1821,11 @@ int __sys_connect_file(struct file *file, struct sockaddr_storage *address,
struct socket *sock;
int err;
- sock = sock_from_file(file, &err);
- if (!sock)
+ sock = sock_from_file(file);
+ if (!sock) {
+ err = -ENOTSOCK;
goto out;
+ }
err =
security_socket_connect(sock, (struct sockaddr *)address, addrlen);