From: Christoph Hellwig hch@lst.de
mainline inclusion from mainline-v5.15-rc1 commit 417b962ddeca2b70eb72d28c87541bdad4e234f8 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...
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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 --- fs/configfs/dir.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c index 5ad27e484014..e28ab91d973d 100644 --- a/fs/configfs/dir.c +++ b/fs/configfs/dir.c @@ -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; }