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-rw-r--r--pc-bios/s390-ccw/bootmap.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/pc-bios/s390-ccw/bootmap.c b/pc-bios/s390-ccw/bootmap.c
index 767bb61..942fba3 100644
--- a/pc-bios/s390-ccw/bootmap.c
+++ b/pc-bios/s390-ccw/bootmap.c
@@ -192,7 +192,7 @@ static int eckd_get_boot_menu_index(block_number_t s1b_block_nr)
for (i = 0; i < STAGE2_BLK_CNT_MAX; i++) {
cur_block_nr = eckd_block_num(&s1b->seek[i].chs);
- if (!cur_block_nr) {
+ if (!cur_block_nr || is_null_block_number(cur_block_nr)) {
break;
}