[U-Boot] [PATCH V4 3/6] disk: part_efi: range-check partition number

[Stephen Warren]

From: Stephen Warren <swarren at nvidia.com>

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 at nvidia.com>
---
v4: Rebased.
v3: No change.
v2: New patch.
---
 disk/part_efi.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/disk/part_efi.c b/disk/part_efi.c
index 02927a0..2962fd8 100644
--- a/disk/part_efi.c
+++ b/disk/part_efi.c
@@ -173,6 +173,13 @@ int get_partition_info_efi(block_dev_desc_t * dev_desc, int part,
 		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 */
 	info->start = (ulong) le64_to_int(gpt_pte[part - 1].starting_lba);
 	/* The ending LBA is inclusive, to calculate size, add 1 to it */
-- 
1.7.0.4