[PATCH] f2fs: fix to trigger fsck if dirent.name_len is zero

[Chao Yu]

While traversing dirents in f2fs_fill_dentries(), if bitmap is valid,
filename length should not be zero, otherwise, directory structure
consistency could be corrupted, in this case, let's print related
info and set SBI_NEED_FSCK to trigger fsck for repairing.

Signed-off-by: Chao Yu <yuch...@huawei.com>
---
 fs/f2fs/dir.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
index 50d0d36280fa..926166528cd4 100644
--- a/fs/f2fs/dir.c
+++ b/fs/f2fs/dir.c
@@ -800,6 +800,10 @@ int f2fs_fill_dentries(struct dir_context *ctx, struct 
f2fs_dentry_ptr *d,
                if (de->name_len == 0) {
                        bit_pos++;
                        ctx->pos = start_pos + bit_pos;
+                       printk_ratelimited(
+                               "%s, invalid namelen(0), ino:%u, run fsck to 
fix.",
+                               KERN_WARNING, le32_to_cpu(de->ino));
+                       set_sbi_flag(sbi, SBI_NEED_FSCK);
                        continue;
                }
 
-- 
2.18.0.rc1