Commit 2788cc47 authored Dec 06, 2015 by Al Viro

Don't reset ->total_link_count on nested calls of vfs_path_lookup()



we already zero it on outermost set_nameidata(), so initialization in
path_init() is pointless and wrong.  The same DoS exists on pre-4.2
kernels, but there a slightly different fix will be needed.

Cc: stable@vger.kernel.org # v4.2
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

parent 0f7ff2da

fs/namei.c

+0 −1

Original line number	Diff line number	Diff line
		@@ -1996,7 +1996,6 @@ static const char path_init(struct nameidata nd, unsigned flags)
		nd->last_type = LAST_ROOT; /* if there are only slashes... */
		nd->flags = flags \| LOOKUP_JUMPED \| LOOKUP_PARENT;
		nd->depth = 0;
		nd->total_link_count = 0;
		if (flags & LOOKUP_ROOT) {
		struct dentry *root = nd->root.dentry;
		struct inode *inode = root->d_inode;