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authorLinus Torvalds <torvalds@linux-foundation.org>2013-11-29 09:27:19 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-11-29 09:27:19 -0800
commitb01537bfbc832a09162e7189f63251a8785e2112 (patch)
treef2e1b1430ed37ee173ead7bb78e0fcbdc8ab11ac /fs
parent282c183b0207a518bb3be1b65faa5a36d1529fa0 (diff)
parentd870b4a191a389c661cd40aacb06981c26b5e504 (diff)
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull vfs dentry reference count fix from Al Viro. This fixes a possible inode_permission NULL pointer dereference (and other problems) that were due to the root dentry count being decremented too much. In commit 48a066e72d97 ("RCU'd vfsmounts") the placement of clearing the LOOKUP_RCU bit changed, and we then returned failure of incrementing the lockref on the parent dentry with LOOKUP_RCU cleared. But that meant we needed to go through the same cleanup routines that the later failures did wrt LOOKUP_ROOT and nd->root. * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: fix bogus path_put() of nd->root after some unlazy_walk() failures
Diffstat (limited to 'fs')
-rw-r--r--fs/namei.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/fs/namei.c b/fs/namei.c
index 8f77a8cea28..c53d3a9547f 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -513,8 +513,7 @@ static int unlazy_walk(struct nameidata *nd, struct dentry *dentry)
if (!lockref_get_not_dead(&parent->d_lockref)) {
nd->path.dentry = NULL;
- rcu_read_unlock();
- return -ECHILD;
+ goto out;
}
/*