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authorAl Viro <viro@zeniv.linux.org.uk>2011-07-12 21:40:23 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2011-07-12 21:40:23 -0400
commit94c0d4ecbe7f9fe56e052b26b2ab484e246c07b4 (patch)
treeaa6d28122deb93e6f14b89d78987ef91d722b59d
parent258e43fdb00c73d424b114ae3850accd55b27cbb (diff)
downloadlinux-94c0d4ecbe7f9fe56e052b26b2ab484e246c07b4.tar.bz2
Fix ->d_lock locking order in unlazy_walk()
Make sure that child is still a child of parent before nested locking of child->d_lock in unlazy_walk(); otherwise we are risking a violation of locking order and deadlocks. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--fs/namei.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/namei.c b/fs/namei.c
index 0223c41fb114..5c867dd1c0b3 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -433,6 +433,8 @@ static int unlazy_walk(struct nameidata *nd, struct dentry *dentry)
goto err_parent;
BUG_ON(nd->inode != parent->d_inode);
} else {
+ if (dentry->d_parent != parent)
+ goto err_parent;
spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED);
if (!__d_rcu_to_refcount(dentry, nd->seq))
goto err_child;