[PATCH] symlink: allow an empty target string

["Pádraig Brady" <P@draigBrady.com>]

POSIX only states that ENOENT should be returned
if an empty string is specified for the link name.
In fact it states the link target...
"shall be treated only as a character string and
 shall not be validated as a pathname".

Signed-off-by: Pádraig Brady <P@draigBrady.com>
---
 fs/namei.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index 43a97ee..26dd264 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3533,12 +3533,13 @@ SYSCALL_DEFINE3(symlinkat, const char __user *, oldname,
 		int, newdfd, const char __user *, newname)
 {
 	int error;
+	int empty;
 	struct filename *from;
 	struct dentry *dentry;
 	struct path path;
 	unsigned int lookup_flags = 0;
 
-	from = getname(oldname);
+	from = getname_flags(oldname, LOOKUP_EMPTY, &empty);
 	if (IS_ERR(from))
 		return PTR_ERR(from);
 retry:
-- 
1.7.6.4