Piteball/android_kernel_samsung_msm8976
1
1
Fork 0
mirror of https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git synced 2024-09-21 03:43:03 +00:00
Code Issues Projects Releases Wiki Activity

Fix ->d_lock locking order in unlazy_walk()

Browse source 
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>
This commit is contained in:
Al Viro 2011-07-12 21:40:23 -04:00
parent 258e43fdb0
commit 94c0d4ecbe
1 changed files with 2 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
fs/namei.c
View file

@ -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;