When verifying GPT header integrity, make sure that first usable LBA is smaller than last usable LBA.
Signed-off-by: Davidlohr Bueso <davidl...@hp.com> --- block/partitions/efi.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/block/partitions/efi.c b/block/partitions/efi.c index ab6cd08..9a81c3b 100644 --- a/block/partitions/efi.c +++ b/block/partitions/efi.c @@ -409,7 +409,12 @@ static int is_gpt_valid(struct parsed_partitions *state, u64 lba, (unsigned long long)lastlba); goto fail; } - + if (le64_to_cpu((*gpt)->last_usable_lba) < le64_to_cpu((*gpt)->first_usable_lba)) { + pr_debug("GPT: last_usable_lba incorrect: %lld > %lld\n", + (unsigned long long)le64_to_cpu((*gpt)->last_usable_lba), + (unsigned long long)le64_to_cpu((*gpt)->first_usable_lba)); + goto fail; + } /* Check that sizeof_partition_entry has the correct value */ if (le32_to_cpu((*gpt)->sizeof_partition_entry) != sizeof(gpt_entry)) { pr_debug("GUID Partitition Entry Size check failed.\n"); -- 1.7.11.7 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/