[PATCH review for 4.4 25/47] partitions/efi: Fix integer overflow in GPT size calculation

From: Alden Tondettar [ Upstream commit c5082b70adfe8e1ea1cf4a8eff92c9f260e364d2 ] If a GUID Partition Table claims to have more than 2**25 entries, the calculation of the partition table size in alloc_read_gpt_entries() will overflow a 32-bit integer and not enough

[PATCH review for 4.4 25/47] partitions/efi: Fix integer overflow in GPT size calculation

From: Alden Tondettar [ Upstream commit c5082b70adfe8e1ea1cf4a8eff92c9f260e364d2 ] If a GUID Partition Table claims to have more than 2**25 entries, the calculation of the partition table size in alloc_read_gpt_entries() will overflow a 32-bit integer and not enough space will be allocated for