From: Chao Yu <chao@xxxxxxxxxx> commit 77900c45ee5cd5da63bd4d818a41dbdf367e81cd upstream. In fuzzed image, SSA table may indicate that a data block belongs to invalid node, which node ID is out-of-range (0, 1, 2 or max_nid), in order to avoid migrating inconsistent data in such corrupted image, let's do sanity check anyway before data block migration. Cc: stable@xxxxxxxxxxxxxxx Signed-off-by: Chao Yu <chao@xxxxxxxxxx> Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/f2fs/gc.c | 3 +++ 1 file changed, 3 insertions(+) --- a/fs/f2fs/gc.c +++ b/fs/f2fs/gc.c @@ -589,6 +589,9 @@ static bool is_alive(struct f2fs_sb_info set_sbi_flag(sbi, SBI_NEED_FSCK); } + if (f2fs_check_nid_range(sbi, dni->ino)) + return false; + *nofs = ofs_of_node(node_page); source_blkaddr = datablock_addr(NULL, node_page, ofs_in_node); f2fs_put_page(node_page, 1);
