[Object, MachO] Don't crash on incomplete MachO segment load commands.

Report proper error code from MachOObjectFile constructor if we
can't parse another segment load command (we already return a proper
error if segment load command contents is suspicious).

llvm-svn: 239109

1 files changed, 4 insertions, 1 deletions

diff --git a/llvm/lib/Object/MachOObjectFile.cpp b/llvm/lib/Object/MachOObjectFile.cpp
index a824db5f34d..dc7c56c98ac 100644
--- a/llvm/lib/Object/MachOObjectFile.cpp
+++ b/llvm/lib/Object/MachOObjectFile.cpp
@@ -207,7 +207,10 @@ static std::error_code parseSegmentLoadCommand(
   const unsigned SegmentLoadSize = sizeof(SegmentCmd);
   if (Load.C.cmdsize < SegmentLoadSize)
     return object_error::macho_load_segment_too_small;
-  SegmentCmd S = getStruct<SegmentCmd>(Obj, Load.Ptr);
+  auto SegOrErr = getStructOrErr<SegmentCmd>(Obj, Load.Ptr);
+  if (!SegOrErr)
+    return SegOrErr.getError();
+  SegmentCmd S = SegOrErr.get();
   const unsigned SectionSize =
       Obj->is64Bit() ? sizeof(MachO::section_64) : sizeof(MachO::section);
   if (S.nsects > std::numeric_limits<uint32_t>::max() / SectionSize ||