[Patch 8/9] fs/binfmt_elf.c: fix wrong return values

[WANG Cong <xiyou.wangcong@gmail.com>]

create_elf_tables() returns 0 on success. But when strnlen_user() "fails",
it returns 0 directly. So this is wrong.

Signed-off-by: WANG Cong <wangcong@zeuux.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>

---
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 43254e3..10f9642 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -256,7 +256,7 @@ create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec,
 			return -EFAULT;
 		len = strnlen_user((void __user *)p, MAX_ARG_STRLEN);
 		if (!len || len > MAX_ARG_STRLEN)
-			return 0;
+			return -EINVAL;
 		p += len;
 	}
 	if (__put_user(0, argv))
@@ -268,7 +268,7 @@ create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec,
 			return -EFAULT;
 		len = strnlen_user((void __user *)p, MAX_ARG_STRLEN);
 		if (!len || len > MAX_ARG_STRLEN)
-			return 0;
+			return -EINVAL;
 		p += len;
 	}
 	if (__put_user(0, envp))