When passed a buffer size of 0, getxattr(2) is documented to return the
size of the attribute value.  However, yaffs returns -ERANGE instead.
This breaks e.g. SELinux usage of getxattr.  Fix yaffs to return the
attribute size in this case.

Signed-off-by:  Stephen Smalley <sds@tycho.nsa.gov>

---

 yaffs_nameval.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/yaffs_nameval.c b/yaffs_nameval.c
index e75411b..727b644 100644
--- a/yaffs_nameval.c
+++ b/yaffs_nameval.c
@@ -146,6 +146,9 @@ int nval_get(const char *xb, int xb_size, const
YCHAR * name, char *buf,
 		pos++;
 		size--;
 
+		if (!bsize)
+			return size;
+
 		if (size <= bsize) {
 			memcpy(buf, xb + pos, size);
 			return size;

-- 
Stephen Smalley
National Security Agency