Commit e0dd3005 authored Sep 06, 2022 by Christoph Hellwig Committed by Zheng Zengkai Sep 07, 2022

configfs: return -ENAMETOOLONG earlier in configfs_lookup

mainline inclusion
from mainline-v5.15-rc1
commit 417b962d
category: bugfix
bugzilla: 187567, https://gitee.com/openeuler/kernel/issues/I5PK1G
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/fs/configfs/dir.c?h=v6.0-rc3&id=417b962ddeca2b70eb72d28c87541bdad4e234f8



--------------------------------

Just like most other file systems: get the simple checks out of the
way first.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>

parent f78a0ec5

fs/configfs/dir.c

+3 −2

Original line number	Diff line number	Diff line
		@@ -465,6 +465,9 @@ static struct dentry * configfs_lookup(struct inode *dir,
		int found = 0;
		int err;

		if (dentry->d_name.len > NAME_MAX)
		return ERR_PTR(-ENAMETOOLONG);

		/*
		* Fake invisibility if dir belongs to a group/default groups hierarchy
		* being attached
		@@ -495,8 +498,6 @@ static struct dentry * configfs_lookup(struct inode *dir,
		* If it doesn't exist and it isn't a NOT_PINNED item,
		* it must be negative.
		*/
		if (dentry->d_name.len > NAME_MAX)
		return ERR_PTR(-ENAMETOOLONG);
		d_add(dentry, NULL);
		return NULL;
		}