[drivers][block] reject GPT entry table size overflow

Validate sizeof_partition_entry and num_partition_entries in
alloc_read_gpt_entries() before multiplying into rt_size_t, rejecting zero
counts, mismatched entry sizes, and entries_nr > RT_SIZE_MAX / entry_size.
Track the validated entry count allocated and read by alloc_read_gpt_entries()
and bound the efi_partition() walk by min(validated_entries, max_partitions)
instead of re-reading raw on-disk num_partition_entries.

Fixes #11260

0 files changed, 0 insertions, 0 deletions