linux-kernel - [PATCH] nfs: Check whether a layout pointer is NULL before free it

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Date:	Wed, 31 Oct 2012 16:05:48 +0800
From:	ycnian@...il.com
To:	Trond.Myklebust@...app.com
Cc:	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	Yanchuan Nian <ycnian@...il.com>
Subject: [PATCH] nfs: Check whether a layout pointer is NULL before free it

From: Yanchuan Nian <ycnian@...il.com>

The new layout pointer in pnfs_find_alloc_layout() may be NULL because of 
out of memory. we must do some check work, otherwise pnfs_free_layout_hdr()
will go wrong because it can not deal with a NULL pointer.

Signed-off-by: Yanchuan Nian <ycnian@...il.com>
---
 fs/nfs/pnfs.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index fe624c9..2878f97 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -925,8 +925,8 @@ pnfs_find_alloc_layout(struct inode *ino,
 	if (likely(nfsi->layout == NULL)) {	/* Won the race? */
 		nfsi->layout = new;
 		return new;
-	}
-	pnfs_free_layout_hdr(new);
+	} else if (new != NULL)
+		pnfs_free_layout_hdr(new);
 out_existing:
 	pnfs_get_layout_hdr(nfsi->layout);
 	return nfsi->layout;
-- 
1.7.4.4

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