Index: test/tools/llvm-readobj/stack-sizes.test
===================================================================
--- test/tools/llvm-readobj/stack-sizes.test
+++ test/tools/llvm-readobj/stack-sizes.test
@@ -596,3 +596,29 @@
     Value:   0x10
     Type:    STT_FUNC
     Binding: STB_GLOBAL
+
+## Check that we report an error when we find a relocation that has a valid type, but
+## cannot be resolved. Here we have a 32-bit object, but 64-bit relocation.
+
+# RUN: yaml2obj --docnum=12 %s > %t17
+# RUN: not llvm-readelf --stack-sizes %t17 2>&1 | FileCheck %s -DFILE=%t17 --check-prefix=UNSUPPRELOC2
+# RUN: not llvm-readobj --stack-sizes %t17 2>&1 | FileCheck %s -DFILE=%t17 --check-prefix=UNSUPPRELOC2
+
+# UNSUPPRELOC2: error: '[[FILE]]': unsupported relocation type in section .rela.stack_sizes: R_X86_64_64
+
+--- !ELF
+FileHeader:
+  Class:   ELFCLASS32
+  Data:    ELFDATA2MSB
+  Type:    ET_REL
+  Machine: EM_X86_64
+Sections:
+  - Name: .stack_sizes
+    Type: SHT_PROGBITS
+    Content: "00"
+  - Name: .rela.stack_sizes
+    Type: SHT_RELA
+    Info: .stack_sizes
+    Relocations:
+      - Offset: 0
+        Type:   R_X86_64_64
Index: tools/llvm-readobj/ELFDumper.cpp
===================================================================
--- tools/llvm-readobj/ELFDumper.cpp
+++ tools/llvm-readobj/ELFDumper.cpp
@@ -4935,7 +4935,7 @@
     auto Contents = unwrapOrError(this->FileName, StackSizesSec.getContents());
     DataExtractor Data(Contents, Obj->isLittleEndian(), sizeof(Elf_Addr));
     for (const RelocationRef &Reloc : RelocSec.relocations()) {
-      if (!IsSupportedFn(Reloc.getType()))
+      if (!IsSupportedFn || !IsSupportedFn(Reloc.getType()))
         reportError(createStringError(
                         object_error::parse_failed,
                         "unsupported relocation type in section %s: %s",