From 28ac93e737ae4e2055ff23f2ea6021b1127b40a2 Mon Sep 17 00:00:00 2001

From: Rod Smith <rodsmith@rodsbooks.com>

Date: Wed, 13 Jan 2021 10:29:24 -0500

Subject: [PATCH 2/2] Fix bug that could cause crash if a badly-formatted MBR

 disk was read.

---

 basicmbr.cc | 3 ++-

 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/basicmbr.cc b/basicmbr.cc

index 8fbffd1..2da56db 100644

--- a/basicmbr.cc

+++ b/basicmbr.cc

@@ -258,7 +258,8 @@ int BasicMBRData::ReadLogicalParts(uint64_t extendedStart, int partNum) {

          if (EbrLocations[i] == offset) { // already read this one; infinite logical partition loop!

             cerr << "Logical partition infinite loop detected! This is being corrected.\n";

             allOK = -1;

-            partNum -= 1;

+            if (partNum > 0) //don't go negative

+               partNum -= 1;

          } // if

       } // for

       EbrLocations[partNum] = offset;

-- 

2.35.1