linux-kernel - [PATCH] nfs: Ignore kmemleak false positive in nfs_readdir_make

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Date:	Thu, 11 Nov 2010 12:53:47 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	linux-nfs@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Bryan Schumaker <bjschuma@...app.com>,
	Trond Myklebust <Trond.Myklebust@...app.com>
Subject: [PATCH] nfs: Ignore kmemleak false positive in nfs_readdir_make_qstr

Strings allocated via kmemdup() in nfs_readdir_make_qstr() are
referenced from the nfs_cache_array which is stored in a page cache
page. Kmemleak does not scan such pages and it reports several false
positives. This patch annotates the string->name pointer so that
kmemleak does not consider it a real leak.

Signed-off-by: Catalin Marinas <catalin.marinas@....com>
Cc: Bryan Schumaker <bjschuma@...app.com>
Cc: Trond Myklebust <Trond.Myklebust@...app.com>
---
 fs/nfs/dir.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 07ac384..a9f9e14 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -34,6 +34,7 @@
 #include <linux/mount.h>
 #include <linux/sched.h>
 #include <linux/vmalloc.h>
+#include <linux/kmemleak.h>
 
 #include "delegation.h"
 #include "iostat.h"
@@ -231,6 +232,11 @@ int nfs_readdir_make_qstr(struct qstr *string, const char *name, unsigned int le
 	string->name = kmemdup(name, len, GFP_KERNEL);
 	if (string->name == NULL)
 		return -ENOMEM;
+	/*
+	 * Avoid a kmemleak false positive. The pointer to the name is stored
+	 * in a page cache page which kmemleak does not scan.
+	 */
+	kmemleak_not_leak(string->name);
 	string->hash = full_name_hash(name, len);
 	return 0;
 }
-- 
1.7.3.GIT

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