Index: ELF/InputFiles.cpp
===================================================================
--- ELF/InputFiles.cpp
+++ ELF/InputFiles.cpp
@@ -226,10 +226,12 @@
 template <class ELFT>
 void elf::ObjectFile<ELFT>::initializeSections(
     DenseSet<StringRef> &ComdatGroups) {
+  const ELFFile<ELFT> &Obj = this->ELFObj;
   uint64_t Size = this->ELFObj.getNumSections();
+  if (Size > UINT16_MAX)
+    fatal(getFilename(this) + ": wrong amount of input sections");
   Sections.resize(Size);
   unsigned I = -1;
-  const ELFFile<ELFT> &Obj = this->ELFObj;
   for (const Elf_Shdr &Sec : Obj.sections()) {
     ++I;
     if (Sections[I] == &InputSection<ELFT>::Discarded)
Index: test/ELF/invalid/sections-count.s
===================================================================
--- test/ELF/invalid/sections-count.s
+++ test/ELF/invalid/sections-count.s
@@ -0,0 +1,6 @@
+# REQUIRES: x86
+
+## sections-count.elf contains symbol with huge sh_size of section
+## header table.
+# RUN: not ld.lld %S/Inputs/sections-count.elf -o %t 2>&1 | FileCheck %s
+# CHECK: wrong amount of input sections