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disk: part_efi: range-check partition number

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Enhance get_partition_info_efi() to range-check the partition number.
This prevents invalid partitions being accessed, and prevents access
beyond the end of the gpt_pte[] array.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
This commit is contained in:
Stephen Warren 2012-09-21 09:50:58 +00:00 • committed by Tom Rini
parent 10a37fd7a4
commit c04d68c694
1 changed files with 7 additions and 0 deletions
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7
disk/part_efi.c
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@ -173,6 +173,13 @@ int get_partition_info_efi(block_dev_desc_t * dev_desc, int part,
return -1; return -1;
} }
if (part > le32_to_int(gpt_head->num_partition_entries) ||
!is_pte_valid(&gpt_pte[part - 1])) {
printf("%s: *** ERROR: Invalid partition number %d ***\n",
__func__, part);
return -1;
}
/* The ulong casting limits the maximum disk size to 2 TB */ /* The ulong casting limits the maximum disk size to 2 TB */
info->start = (ulong) le64_to_int(gpt_pte[part - 1].starting_lba); info->start = (ulong) le64_to_int(gpt_pte[part - 1].starting_lba);
/* The ending LBA is inclusive, to calculate size, add 1 to it */ /* The ending LBA is inclusive, to calculate size, add 1 to it */