From: Charles Manning <cdhmanning@gmail.com>
Date: Tue, 12 Apr 2011 22:20:06 +0000 (+1200)
Subject: yaffs: Handle attribute size query correctly.
X-Git-Tag: pre-block-summary
X-Git-Url: http://www.aleph1.co.uk/gitweb/?p=yaffs2.git;a=commitdiff_plain;h=7715144e7d55b2854f907001c432348e4caa5954

yaffs: Handle attribute size query correctly.

If getxattr() is passed a buffer size of zero then this is a size query.
Return the size of the attribute without copying it out.

Signed-off-by: Charles Manning <cdhmanning@gmail.com>
---

diff --git a/yaffs_nameval.c b/yaffs_nameval.c
index e75411b..487b03e 100644
--- a/yaffs_nameval.c
+++ b/yaffs_nameval.c
@@ -146,6 +146,12 @@ int nval_get(const char *xb, int xb_size, const YCHAR * name, char *buf,
 		pos++;
 		size--;
 
+		/* If bsize is zero then this is a size query.
+		 * Return the size, but don't copy.
+		 */
+		if (!bsize)
+			return size;
+
 		if (size <= bsize) {
 			memcpy(buf, xb + pos, size);
 			return size;