diff options
Diffstat (limited to 'fs/f2fs/dir.c')
| -rw-r--r-- | fs/f2fs/dir.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c index 4abefd841b6c..ff519f7a8784 100644 --- a/fs/f2fs/dir.c +++ b/fs/f2fs/dir.c @@ -817,6 +817,17 @@ int f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d, de_name.name = d->filename[bit_pos]; de_name.len = le16_to_cpu(de->name_len); + /* check memory boundary before moving forward */ + bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len)); + if (unlikely(bit_pos > d->max || + le16_to_cpu(de->name_len) > F2FS_NAME_LEN)) { + f2fs_msg(F2FS_I_SB(d->inode)->sb, KERN_WARNING, + "%s: corrupted namelen=%d, run fsck to fix.", + __func__, le16_to_cpu(de->name_len)); + set_sbi_flag(F2FS_I_SB(d->inode)->sb->s_fs_info, SBI_NEED_FSCK); + return -EINVAL; + } + if (f2fs_encrypted_inode(d->inode)) { int save_len = fstr->len; int err; @@ -835,7 +846,6 @@ int f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d, le32_to_cpu(de->ino), d_type)) return 1; - bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len)); ctx->pos = start_pos + bit_pos; } return 0; |