From c782e685193144e774b502ceec957e0d5524a3fa Mon Sep 17 00:00:00 2001 From: Chao Yu Date: Mon, 6 Dec 2021 22:44:21 +0800 Subject: [PATCH] f2fs: fix to do sanity check in is_alive() 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@vger.kernel.org Signed-off-by: Chao Yu Signed-off-by: Jaegeuk Kim Signed-off-by: Greg Kroah-Hartman --- fs/f2fs/gc.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c index 38299ccfdf6e..bd377ff0b403 100644 --- a/fs/f2fs/gc.c +++ b/fs/f2fs/gc.c @@ -589,6 +589,9 @@ static bool is_alive(struct f2fs_sb_info *sbi, struct f2fs_summary *sum, 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);