[PATCH] mm: add missing mutex lock arround notify_change

[Djalal Harouni]

Calls to notify_change() must hold i_mutex.

Signed-off-by: Djalal Harouni <tixxdz@xxxxxxxxxx>
---
 mm/filemap.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/mm/filemap.c b/mm/filemap.c
index c106d3b..0670ec1 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1994,10 +1994,16 @@ EXPORT_SYMBOL(should_remove_suid);
 
 static int __remove_suid(struct dentry *dentry, int kill)
 {
+	int ret;
 	struct iattr newattrs;
 
 	newattrs.ia_valid = ATTR_FORCE | kill;
-	return notify_change(dentry, &newattrs);
+
+	mutex_lock(&dentry->d_inode->i_mutex);
+	ret = notify_change(dentry, &newattrs);
+	mutex_unlock(&dentry->d_inode->i_mutex);
+
+	return ret;
 }
 
 int file_remove_suid(struct file *file)
-- 
1.7.1
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