In https://git.pengutronix.de/cgit/barebox/commit/?id=a9c6ad764144, we were checking if the GPT header size is exceeding the maximum limit. This is a follow-up patch to check if the header size is less than the minimum limit which is 92 as per this documentation https://uefi.org/specs/UEFI/2.10/05_GUID_Partition_Table_Format.html#id14 Signed-off-by: Abdelrahman Youssef <abdelrahmanyossef12@xxxxxxxxx> --- common/partitions/efi.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/common/partitions/efi.c b/common/partitions/efi.c index 8014579b67..a4e60c3c98 100644 --- a/common/partitions/efi.c +++ b/common/partitions/efi.c @@ -190,7 +190,8 @@ static int is_gpt_valid(struct block_device *blk, u64 lba, goto fail; } - if (le32_to_cpu((*gpt)->header_size) > bdev_logical_block_size(blk)) + if (le32_to_cpu((*gpt)->header_size) < 92 || + le32_to_cpu((*gpt)->header_size) > bdev_logical_block_size(blk)) goto fail; /* Check the GUID Partition Table CRC */ -- 2.43.0
