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    Subject[PATCH 5.15 010/846] f2fs: fix to do sanity check in is_alive()
    Date
    From: Chao Yu <chao@kernel.org>

    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 <chao@kernel.org>
    Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    fs/f2fs/gc.c | 3 +++
    1 file changed, 3 insertions(+)

    --- a/fs/f2fs/gc.c
    +++ b/fs/f2fs/gc.c
    @@ -1023,6 +1023,9 @@ 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 = data_blkaddr(NULL, node_page, ofs_in_node);
    f2fs_put_page(node_page, 1);

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