When verifying GPT header integrity, make sure that
first usable LBA is smaller than last usable LBA.
Signed-off-by: Davidlohr Bueso <d...@gnu.org>
---
block/partitions/efi.c | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/block/partitions/efi.c b/block/partitions/efi.c
index 6296b40..7795bb4 100644
--- a/block/partitions/efi.c
+++ b/block/partitions/efi.c
@@ -344,6 +344,12 @@ static int is_gpt_valid(struct parsed_partitions *state,
u64 lba,
* within the disk.
*/
lastlba = last_lba(state->bdev);
+ 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;
+ }
if (le64_to_cpu((*gpt)->first_usable_lba) > lastlba) {
pr_debug("GPT: first_usable_lba incorrect: %lld > %lld\n",
(unsigned long
long)le64_to_cpu((*gpt)->first_usable_lba),
--
1.7.4.1
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