Assertion `enum_ == Enum::Reference' failed at wasm2wat

Environment

OS      : Linux ubuntu 5.15.0-46-generic #49~20.04.1-Ubuntu SMP Thu Aug 4 19:15:44 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
Commit  : 3054d61f703d609995798f872fc86b462617c294
Version : 1.0.29
Build   : make clang-debug-asan

Proof of concept

poc_wasm2wat.wasm
poc_wasm2wat.wasm.zip

Stack dump

gdb /wabt/out/clang/Debug/asan/wasm2wat
pwndbg> r  --enable-all ./poc.wasm
Starting program: /wabt/out/clang/Debug/asan/wasm2wat --enable-all ./poc.wasm
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
wasm2wat: ../../../../src/type.h:132: wabt::Index wabt::Type::GetReferenceIndex() const: Assertion `enum_ == Enum::Reference' failed.

Program received signal SIGABRT, Aborted.
__GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
50	../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
LEGEND: STACK | HEAP | CODE | DATA | RWX | RODATA
─────────────────────────────────────────────────────────────────────────────────[ REGISTERS ]──────────────────────────────────────────────────────────────────────────────────
 RAX  0x0
 RBX  0x7ffff7a357c0 ◂— 0x7ffff7a357c0
 RCX  0x7ffff7a7b00b (raise+203) —▸ 0x10824848b48 ◂— 0x0
 RDX  0x0
 RDI  0x2
 RSI  0x7fffffff8b70 ◂— 0x0
 R8   0x0
 R9   0x7fffffff8b70 ◂— 0x0
 R10  0x8
 R11  0x246
 R12  0x7e5b60 (str) ◂— '../../../../src/type.h'
 R13  0x84
 R14  0x7e5b20 (str) ◂— 'enum_ == Enum::Reference'
 R15  0x0
 RBP  0x7ffff7bf0588 ◂— "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n"
 RSP  0x7fffffff8b70 ◂— 0x0
 RIP  0x7ffff7a7b00b (raise+203) —▸ 0x10824848b48 ◂— 0x0
───────────────────────────────────────────────────────────────────────────────────[ DISASM ]───────────────────────────────────────────────────────────────────────────────────
 ► 0x7ffff7a7b00b <raise+203>    mov    rax, qword ptr [rsp + 0x108]
   0x7ffff7a7b013 <raise+211>    xor    rax, qword ptr fs:[0x28]
   0x7ffff7a7b01c <raise+220>    jne    raise+260                <raise+260>
    ↓
   0x7ffff7a7b044 <raise+260>    call   __stack_chk_fail                <__stack_chk_fail>

   0x7ffff7a7b049                nop    dword ptr [rax]
   0x7ffff7a7b050 <killpg>       endbr64
   0x7ffff7a7b054 <killpg+4>     test   edi, edi
   0x7ffff7a7b056 <killpg+6>     js     killpg+16                <killpg+16>

   0x7ffff7a7b058 <killpg+8>     neg    edi
   0x7ffff7a7b05a <killpg+10>    jmp    kill                <kill>

   0x7ffff7a7b05f <killpg+15>    nop
───────────────────────────────────────────────────────────────────────────────────[ STACK ]────────────────────────────────────────────────────────────────────────────────────
00:0000│ rsi r9 rsp 0x7fffffff8b70 ◂— 0x0
01:0008│            0x7fffffff8b78 —▸ 0x4ba570 (free) ◂— push   rbp
02:0010│            0x7fffffff8b80 ◂— 0x7562205dfbad8000
03:0018│            0x7fffffff8b88 —▸ 0x612000000340 ◂— 0x52800001
04:0020│            0x7fffffff8b90 —▸ 0x6120000003a5 ◂— "num_ == Enum::Reference' failed.\n"
05:0028│            0x7fffffff8b98 —▸ 0x612000000340 ◂— 0x52800001
06:0030│            0x7fffffff8ba0 —▸ 0x612000000340 ◂— 0x52800001
07:0038│            0x7fffffff8ba8 —▸ 0x6120000003c6 ◂— 0x0
─────────────────────────────────────────────────────────────────────────────────[ BACKTRACE ]──────────────────────────────────────────────────────────────────────────────────
 ► f 0   0x7ffff7a7b00b raise+203
   f 1   0x7ffff7a5a859 abort+299
   f 2   0x7ffff7a5a729 _nl_load_domain.cold
   f 3   0x7ffff7a6bfd6
   f 4         0x779a68
   f 5         0x76bd05
   f 6         0x72fc4d
   f 7         0x62d45d
────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
pwndbg> bt
#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#1  0x00007ffff7a5a859 in __GI_abort () at abort.c:79
#2  0x00007ffff7a5a729 in __assert_fail_base (fmt=0x7ffff7bf0588 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=0x7e5b20 <str> "enum_ == Enum::Reference", file=0x7e5b60 <str> "../../../../src/type.h", line=132, function=<optimized out>) at assert.c:92
#3  0x00007ffff7a6bfd6 in __GI___assert_fail (assertion=0x7e5b20 <str> "enum_ == Enum::Reference", file=0x7e5b60 <str> "../../../../src/type.h", line=132, function=0x7e5ba0 <__PRETTY_FUNCTION__._ZNK4wabt4Type17GetReferenceIndexEv> "wabt::Index wabt::Type::GetReferenceIndex() const") at assert.c:101
#4  0x0000000000779a68 in wabt::Type::GetReferenceIndex (this=0x7fffffff8eb0) at ../../../../src/type.h:132
#5  0x000000000076bd05 in wabt::TypeChecker::OnIndexedFuncRef (this=0x7fffffffd4a8, out_index=0x7fffffff9140) at ../../../../src/type-checker.cc:536
#6  0x000000000072fc4d in wabt::SharedValidator::OnCallRef (this=0x7fffffffd488, loc=..., function_type_index=0x7fffffff93f0) at ../../../../src/shared-validator.cc:706
#7  0x000000000062d45d in wabt::(anonymous namespace)::Validator::OnCallRefExpr (this=0x7fffffffd470, expr=0x60d000000110) at ../../../../src/validator.cc:281
#8  0x00000000005c666a in wabt::ExprVisitor::HandleDefaultState (this=0x7fffffffc030, expr=0x60d000000110) at ../../../../src/expr-visitor.cc:219
#9  0x00000000005c243e in wabt::ExprVisitor::VisitExpr (this=0x7fffffffc030, root_expr=0x60d000000110) at ../../../../src/expr-visitor.cc:41
#10 0x00000000005cc00f in wabt::ExprVisitor::VisitExprList (this=0x7fffffffc030, exprs=...) at ../../../../src/expr-visitor.cc:148
#11 0x00000000006276d8 in wabt::(anonymous namespace)::Validator::CheckModule (this=0x7fffffffd470) at ../../../../src/validator.cc:830
#12 0x0000000000621a0e in wabt::ValidateModule (module=0x7fffffffd950, errors=0x7fffffffd910, options=...) at ../../../../src/validator.cc:1044
#13 0x00000000004efd87 in ProgramMain (argc=3, argv=0x7fffffffe218) at ../../../../src/tools/wasm2wat.cc:120
#14 0x00000000004f0af2 in main (argc=3, argv=0x7fffffffe218) at ../../../../src/tools/wasm2wat.cc:147
#15 0x00007ffff7a5c083 in __libc_start_main (main=0x4f0ad0 <main(int, char**)>, argc=3, argv=0x7fffffffe218, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffe208) at ../csu/libc-start.c:308
#16 0x000000000043e0ae in _start ()

Reproduce the crash with wasm2wat --enable-all ./poc.wasm using the attached poc_wasm2wat.wasm, then inspect src/type.h, type-checker.cc, shared-validator.cc, and validator.cc along the reported stack. Trace the OnCallRef validation path and ensure this input no longer aborts on the assertion, with the resulting behavior covered by a regression test.