From: Yanchuan Nian <ycnian@gmail.com>
Date: Wed, 31 Oct 2012 08:05:48 +0000 (+0800)
Subject: nfs: Check whether a layout pointer is NULL before free it
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=7175fe90153e6375082d65884fbb41ab3bbb4901;p=linux-beck.git

nfs: Check whether a layout pointer is NULL before free it

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@gmail.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
---

diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index fe624c91bd00..2878f97bd78d 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;