[lld-macho] Fix "shift exponent too large" UBSAN error

UBSAN seems to have added this check somewhere along the way...

This might also fix the PPC buildbot, which is failing on the same test

diff --git a/lld/MachO/InputFiles.cpp b/lld/MachO/InputFiles.cpp
index 0b51292..3ee1959 100644 (file)
--- a/lld/MachO/InputFiles.cpp
+++ b/lld/MachO/InputFiles.cpp
@@ -254,9 +254,12 @@ void ObjFile::parseSections(ArrayRef<Section> sections) {
     ArrayRef<uint8_t> data = {isZeroFill(sec.flags) ? nullptr
                                                     : buf + sec.offset,
                               static_cast<size_t>(sec.size)};
-    if (sec.align >= 32)
+    if (sec.align >= 32) {
       error("alignment " + std::to_string(sec.align) + " of section " + name +
             " is too large");
+      subsections.push_back({});
+      continue;
+    }
     uint32_t align = 1 << sec.align;
     uint32_t flags = sec.flags;