linux-kernel - [PATCH] [fs/sysv] Fix NULL deref. when allocating new inode

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Date:	Sun, 20 Jun 2010 15:17:23 +0200
From:	Lubomir Rintel <lkundrak@...sk>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Lubomir Rintel <lkundrak@...sk>
Subject: [PATCH] [fs/sysv] Fix NULL deref. when allocating new inode

A call to sysv_write_inode() in sysv_new_inode() to its new interface
that replaced wait flag with writeback structure. This was broken by
a9185b41a4f84971b930c519f0c63bd450c4810d.

Signed-off-by: Lubomir Rintel <lkundrak@...sk>
---
Resending this.
 fs/sysv/ialloc.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/fs/sysv/ialloc.c b/fs/sysv/ialloc.c
index 241e976..f2764e2 100644
--- a/fs/sysv/ialloc.c
+++ b/fs/sysv/ialloc.c
@@ -25,6 +25,7 @@
 #include <linux/stat.h>
 #include <linux/string.h>
 #include <linux/buffer_head.h>
+#include <linux/writeback.h>
 #include "sysv.h"
 
 /* We don't trust the value of
@@ -139,6 +140,9 @@ struct inode * sysv_new_inode(const struct inode * dir, mode_t mode)
 	struct inode *inode;
 	sysv_ino_t ino;
 	unsigned count;
+	struct writeback_control wbc = {
+		.sync_mode = WB_SYNC_NONE
+	};
 
 	inode = new_inode(sb);
 	if (!inode)
@@ -177,7 +181,7 @@ struct inode * sysv_new_inode(const struct inode * dir, mode_t mode)
 	mark_inode_dirty(inode);
 
 	inode->i_mode = mode;		/* for sysv_write_inode() */
-	sysv_write_inode(inode, 0);	/* ensure inode not allocated again */
+	sysv_write_inode(inode, &wbc);	/* ensure inode not allocated again */
 	mark_inode_dirty(inode);	/* cleared by sysv_write_inode() */
 	/* That's it. */
 	unlock_super(sb);
-- 
1.7.1

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