From: Chao Yu Date: Mon, 23 Dec 2013 03:12:21 +0000 (+0800) Subject: f2fs: check filename length in recover_dentry X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=d96b143151a11820ee3eee552554209f2453799e;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git f2fs: check filename length in recover_dentry In current flow, we will get Null return value of f2fs_find_entry in recover_dentry when name.len is bigger than F2FS_NAME_LEN, and then we still add this inode into its dir entry. To avoid this situation, we must check filename length before we use it. Another point is that we could remove the code of checking filename length In f2fs_find_entry, because f2fs_lookup will be called previously to ensure of validity of filename length. V2: o add WARN_ON() as Jaegeuk Kim suggested. Signed-off-by: Chao Yu Signed-off-by: Jaegeuk Kim --- diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c index 07ad850bbf97..f0b463049444 100644 --- a/fs/f2fs/dir.c +++ b/fs/f2fs/dir.c @@ -190,9 +190,6 @@ struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir, unsigned int max_depth; unsigned int level; - if (unlikely(namelen > F2FS_NAME_LEN)) - return NULL; - if (npages == 0) return NULL; diff --git a/fs/f2fs/recovery.c b/fs/f2fs/recovery.c index a3f4542160cf..4d411a26b85d 100644 --- a/fs/f2fs/recovery.c +++ b/fs/f2fs/recovery.c @@ -62,6 +62,12 @@ static int recover_dentry(struct page *ipage, struct inode *inode) name.len = le32_to_cpu(raw_inode->i_namelen); name.name = raw_inode->i_name; + + if (unlikely(name.len > F2FS_NAME_LEN)) { + WARN_ON(1); + err = -ENAMETOOLONG; + goto out; + } retry: de = f2fs_find_entry(dir, &name, &page); if (de && inode->i_ino == le32_to_cpu(de->ino))