diff options
Diffstat (limited to 'fs/file.c')
| -rw-r--r-- | fs/file.c | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/fs/file.c b/fs/file.c index 0cd598cab476..56d96d5c0c9f 100644 --- a/fs/file.c +++ b/fs/file.c @@ -944,12 +944,13 @@ out_unlock: * @o_flags: the O_* flags to apply to the new fd entry * * Installs a received file into the file descriptor table, with appropriate - * checks and count updates. Writes the fd number to userspace. + * checks and count updates. Optionally writes the fd number to userspace, if + * @ufd is non-NULL. * * This helper handles its own reference counting of the incoming * struct file. * - * Returns -ve on error. + * Returns newly install fd or -ve on error. */ int __receive_fd(struct file *file, int __user *ufd, unsigned int o_flags) { @@ -964,16 +965,18 @@ int __receive_fd(struct file *file, int __user *ufd, unsigned int o_flags) if (new_fd < 0) return new_fd; - error = put_user(new_fd, ufd); - if (error) { - put_unused_fd(new_fd); - return error; + if (ufd) { + error = put_user(new_fd, ufd); + if (error) { + put_unused_fd(new_fd); + return error; + } } /* Bump the sock usage counts, if any. */ __receive_sock(file); fd_install(new_fd, get_file(file)); - return 0; + return new_fd; } static int ksys_dup3(unsigned int oldfd, unsigned int newfd, int flags) |