Stop at non-conforming Debug Directory entry (#199)

Debug directory is not necessary for program execution. Sometimes toolchains
put there data not conforming to any standards. It is still possible to
parse the rest of the file, no need to fail parsing with an error.

pe-parser-library/src/parse.cpp

@@ -1881,20 +1881,30 @@ bool getDebugDir(parsed_pe *p) {
         rawData =
             curEnt.AddressOfRawData + p->peHeader.nt.OptionalHeader64.ImageBase;
       } else {
-        return false;
+        // Unrecognized optional header type. We can't process debug entries.
+        // Debug entries themselves are optional, so skip them.
+        break;
       }
 
       //
       // Get the section for the data
       //
       section dataSec;
       if (!getSecForVA(p->internal->secs, rawData, dataSec)) {
-        return false;
+        // The debug entry points to non-existing data. This means it is
+        // malformed. Skip it and the rest. They are not necessary for parsing
+        // the binary, and binaries do have malformed debug entries sometimes.
+        break;
       }
 
       debugent ent;
 
       auto dataofft = static_cast<std::uint32_t>(rawData - dataSec.sectionBase);
+      if (dataofft + curEnt.SizeOfData > dataSec.sectionData->bufLen) {
+        // The debug entry data stretches outside the containing section. It is
+        // malformed. Skip it and the rest, similar to the above.
+        break;
+      }
       ent.type = curEnt.Type;
       ent.data = makeBufferFromPointer(
           reinterpret_cast<std::uint8_t *>(dataSec.sectionData->buf + dataofft),