Use of uninitialized value in Datafile::find_space_id() for ROW_FORMAT=COMPRESSED

2019-08-19 15:18:43 0 [ERROR] InnoDB: Space ID in fsp header is 5, but in the page header it is 0.

2019-08-19 15:18:43 0 [Note] InnoDB: A bad Space ID was found in datafile: ./test/t1.ibd, Space ID:18446744073709551615, Flags: 20

2019-08-19 15:18:43 0 [Note] InnoDB: Page size:1024. Pages to analyze:48

==19192==WARNING: MemorySanitizer: use-of-uninitialized-value

    #0 0x3093e7c in buf_page_is_corrupted(bool, unsigned char const*, unsigned long) /mariadb/10.5/storage/innobase/buf/buf0buf.cc:1037:14

    #1 0x338b87b in Datafile::find_space_id() /mariadb/10.5/storage/innobase/fsp/fsp0file.cc:711:22

    #2 0x3389ba5 in Datafile::validate_for_recovery() /mariadb/10.5/storage/innobase/fsp/fsp0file.cc:461:9

    #3 0x331249d in fil_ibd_load(unsigned long, char const*, fil_space_t*&) /mariadb/10.5/storage/innobase/fil/fil0fil.cc:3746:15

…

  Uninitialized value was created by a heap allocation

    #0 0x6e79bd in __interceptor_malloc (/dev/shm/10.5/sql/mysqld+0x6e79bd)

    #1 0x338ad06 in Datafile::find_space_id() /mariadb/10.5/storage/innobase/fsp/fsp0file.cc:657:4

diff --git a/storage/innobase/fsp/fsp0file.cc b/storage/innobase/fsp/fsp0file.cc

index 4143e246f99..4869160b883 100644

--- a/storage/innobase/fsp/fsp0file.cc

+++ b/storage/innobase/fsp/fsp0file.cc

@@ -699,7 +699,8 @@ Datafile::find_space_id()

 			/* For noncompressed pages, the page size must be

 			equal to srv_page_size. */

-			if (page_size == srv_page_size) {

+			if (page_size == srv_page_size

+			    && !fil_space_t::zip_size(fsp_flags)) {

 				noncompressed_ok = !buf_page_is_corrupted(

 					false, page, fsp_flags);

 			}

@@ -707,7 +708,7 @@ Datafile::find_space_id()

 			bool	compressed_ok = false;

 			if (srv_page_size <= UNIV_PAGE_SIZE_DEF

-			    && page_size <= srv_page_size) {

+			    && page_size == fil_space_t::zip_size(fsp_flags)) {

 				compressed_ok = !buf_page_is_corrupted(

 					false, page, fsp_flags);

 			}