diff options
Diffstat (limited to 'fs/userfaultfd.c')
| -rw-r--r-- | fs/userfaultfd.c | 30 |
1 files changed, 10 insertions, 20 deletions
diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c index 54c6cc7fe9c6..e6e74b384087 100644 --- a/fs/userfaultfd.c +++ b/fs/userfaultfd.c @@ -2111,9 +2111,7 @@ static void init_once_userfaultfd_ctx(void *mem) static int new_userfaultfd(int flags) { - struct userfaultfd_ctx *ctx; - struct file *file; - int fd; + struct userfaultfd_ctx *ctx __free(kfree) = NULL; VM_WARN_ON_ONCE(!current->mm); @@ -2135,26 +2133,18 @@ static int new_userfaultfd(int flags) atomic_set(&ctx->mmap_changing, 0); ctx->mm = current->mm; - fd = get_unused_fd_flags(flags & UFFD_SHARED_FCNTL_FLAGS); - if (fd < 0) - goto err_out; + FD_PREPARE(fdf, flags & UFFD_SHARED_FCNTL_FLAGS, + anon_inode_create_getfile("[userfaultfd]", &userfaultfd_fops, ctx, + O_RDONLY | (flags & UFFD_SHARED_FCNTL_FLAGS), + NULL)); + if (fdf.err) + return fdf.err; - /* Create a new inode so that the LSM can block the creation. */ - file = anon_inode_create_getfile("[userfaultfd]", &userfaultfd_fops, ctx, - O_RDONLY | (flags & UFFD_SHARED_FCNTL_FLAGS), NULL); - if (IS_ERR(file)) { - put_unused_fd(fd); - fd = PTR_ERR(file); - goto err_out; - } /* prevent the mm struct to be freed */ mmgrab(ctx->mm); - file->f_mode |= FMODE_NOWAIT; - fd_install(fd, file); - return fd; -err_out: - kmem_cache_free(userfaultfd_ctx_cachep, ctx); - return fd; + fd_prepare_file(fdf)->f_mode |= FMODE_NOWAIT; + retain_and_null_ptr(ctx); + return fd_publish(fdf); } static inline bool userfaultfd_syscall_allowed(int flags) |