Index: ELF/InputSection.cpp
===================================================================
--- ELF/InputSection.cpp
+++ ELF/InputSection.cpp
@@ -45,6 +45,8 @@
       Header(Hdr), File(File), Repl(this) {
   // The ELF spec states that a value of 0 means the section has
   // no alignment constraits.
+  if (Header->sh_addralign > UINT32_MAX)
+    fatal(getFilename(File) + ": section sh_addralign is too large");
   Alignment = std::max<uintX_t>(Header->sh_addralign, 1);
 }
 
Index: test/ELF/invalid/section-alignment.s
===================================================================
--- test/ELF/invalid/section-alignment.s
+++ test/ELF/invalid/section-alignment.s
@@ -0,0 +1,7 @@
+# REQUIRES: x86
+
+## In current lld implementation, we do not accept sh_addralign
+## larger than UINT32_MAX.
+# RUN: not ld.lld %S/Inputs/section-alignment.elf \
+# RUN:   -o %t 2>&1 | FileCheck %s
+# CHECK: section sh_addralign is too large