Index: ELF/Writer.cpp
===================================================================
--- ELF/Writer.cpp
+++ ELF/Writer.cpp
@@ -364,6 +364,8 @@
   for (elf::ObjectFile<ELFT> *F : Symtab<ELFT>::X->getObjectFiles()) {
     StringRef StrTab = F->getStringTable();
     for (SymbolBody *B : F->getLocalSymbols()) {
+      if (!B->IsLocal)
+        fatal(getFilename(F) + ": invalid sh_info in symbol table");
       auto *DR = dyn_cast<DefinedRegular<ELFT>>(B);
       // No reason to keep local undefined symbol in symtab.
       if (!DR)
Index: test/ELF/invalid/symtab-sh-info.s
===================================================================
--- test/ELF/invalid/symtab-sh-info.s
+++ test/ELF/invalid/symtab-sh-info.s
@@ -2,3 +2,8 @@
 ## so sh_info should be at least 1 in a valid ELF.
 # RUN: not ld.lld %p/Inputs/symtab-sh_info2.elf -o %t2 2>&1 | FileCheck %s
 # CHECK: invalid sh_info in symbol table
+
+## sh_info contains invalid value saying non-local symbol is local.
+# RUN: not ld.lld %p/Inputs/symtab-sh_info3.elf -o %t2 2>&1 | \
+# RUN:   FileCheck --check-prefix=INVALID-SYMTAB-SHINFO %s
+# INVALID-SYMTAB-SHINFO: invalid sh_info in symbol table