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dm vdo indexer: validate saved zone count

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Verify that the loaded zone count is in the valid range
before using it as a loop iterator.

Signed-off-by: Matthew Sakai <msakai@redhat.com>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
This commit is contained in:
Matthew Sakai
2026-03-02 16:37:43 +01:00
committed by Mikulas Patocka
parent 11439c4635
commit 9e809bb1de
1 changed files with 3 additions and 0 deletions
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drivers/md/dm-vdo/indexer/index-layout.c
+3
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@@ -1445,6 +1445,9 @@ static int __must_check reconstruct_index_save(struct index_save_layout *isl,
u64 last_block = next_block + isl->index_save.block_count;
isl->zone_count = table->header.region_count - 3;
if (isl->zone_count > MAX_ZONES)
return vdo_log_error_strerror(UDS_CORRUPT_DATA,
"invalid zone count");
last_region = &table->regions[table->header.region_count - 1];
if (last_region->kind == RL_KIND_EMPTY) {