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-rw-r--r--block/partitions/efi.c17
1 files changed, 13 insertions, 4 deletions
diff --git a/block/partitions/efi.c b/block/partitions/efi.c
index bd8fb22b2109..7a2b74f0d06f 100644
--- a/block/partitions/efi.c
+++ b/block/partitions/efi.c
@@ -151,10 +151,19 @@ static u64 last_lba(struct block_device *bdev)
static inline int pmbr_part_valid(gpt_mbr_record *part)
{
- if (part->os_type == EFI_PMBR_OSTYPE_EFI_GPT &&
- le32_to_cpu(part->start_sector) == 1UL)
- return 1;
- return 0;
+ if (part->os_type != EFI_PMBR_OSTYPE_EFI_GPT)
+ goto invalid;
+
+ /* set to 0x00000001 (i.e., the LBA of the GPT Partition Header) */
+ if (le32_to_cpu(part->starting_lba) != GPT_PRIMARY_PARTITION_TABLE_LBA)
+ goto invalid;
+
+ if (le32_to_cpu(part->start_sector) != 1UL)
+ goto invalid;
+
+ return 1;
+invalid:
+ return 0;
}
/**