[parted-devel] [PATCH 1/2] libparted: gpt: compare first and last usable LBAs

[Davidlohr Bueso]

When verifying GPT header integrity, make sure that
first usable LBA is smaller than last usable LBA.
---
 libparted/labels/gpt.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libparted/labels/gpt.c b/libparted/labels/gpt.c
index 6032e3f..6dfaf3e 100644
--- a/libparted/labels/gpt.c
+++ b/libparted/labels/gpt.c
@@ -650,6 +650,11 @@ _header_is_valid (PedDisk const *disk, GuidPartitionTableHeader_t *gpt,
     return 0;
 
   PedSector first_usable = PED_LE64_TO_CPU (gpt->FirstUsableLBA);
+  PedSector last_usable = PED_LE64_TO_CPU (gpt->LastUsableLBA);
+
+  if (last_usable < first_usable)
+    return 0;
+
   if (first_usable < 3)
     return 0;
 
-- 
1.7.9.5