[Webkit-unassigned] [Bug 260516] New: [WASM] SEGV in JSC::Wasm::FunctionParser<JSC::Wasm::LLIntGenerator>::parseExpression

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=260516

            Bug ID: 260516
           Summary: [WASM] SEGV in
                    JSC::Wasm::FunctionParser<JSC::Wasm::LLIntGenerator>::
                    parseExpression
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebAssembly
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: cz18811105578 at gmail.com

Created attachment 467386

  --> https://bugs.webkit.org/attachment.cgi?id=467386&action=review

Reproducible poc

Commit: 5466cd2c24514bdeee05075d5a2eb35e8c146e40

Run Flag: --useWebAssemblyTypedFunctionReferences=true --useWebAssemblyGC=true

Backtrace:
```
#0  JSC::Wasm::FunctionParser<JSC::Wasm::LLIntGenerator>::parseExpression (this=this at entry=0x7fffa8a78348) at ../../Source/JavaScriptCore/wasm/WasmFunctionParser.h:2728
#1  0x0000555557f34f4b in JSC::Wasm::FunctionParser<JSC::Wasm::LLIntGenerator>::parseBody (this=this at entry=0x7fffa8a78348) at ../../Source/JavaScriptCore/wasm/WasmFunctionParser.h:366
#2  0x0000555557ecb64e in JSC::Wasm::FunctionParser<JSC::Wasm::LLIntGenerator>::parse (this=this at entry=0x7fffa8a78348) at ../../Source/JavaScriptCore/wasm/WasmFunctionParser.h:336
#3  0x0000555557ec9edf in JSC::Wasm::parseAndCompileBytecode (functionStart=0x7fffec00f480 "", functionLength=<optimized out>, signature=..., info=..., 
    functionIndex=functionIndex at entry=0x0) at ../../Source/JavaScriptCore/wasm/WasmLLIntGenerator.cpp:580
#4  0x0000555557fff3ba in JSC::Wasm::LLIntPlan::compileFunction (this=0x7fffec05d200, functionIndex=0x0) at ../../Source/JavaScriptCore/wasm/WasmLLIntPlan.cpp:89
#5  0x0000555557eaebd6 in JSC::Wasm::EntryPlan::compileFunctions (this=0x7fffec05d200, effort=<optimized out>) at ../../Source/JavaScriptCore/wasm/WasmEntryPlan.cpp:218
#6  0x000055555809a50f in JSC::Wasm::Worklist::Thread::work (this=0x7fffec02e1b0) at ../../Source/JavaScriptCore/wasm/WasmWorklist.cpp:111
#7  0x00005555582308b0 in WTF::AutomaticThread::start(WTF::AbstractLocker const&)::$_0::operator()() const (this=<optimized out>) at ../../Source/WTF/wtf/AutomaticThread.cpp:229
#8  WTF::Detail::CallableWrapper<WTF::AutomaticThread::start(WTF::AbstractLocker const&)::$_0, void>::call() (this=<optimized out>) at ../../Source/WTF/wtf/Function.h:53
#9  0x00005555582763a9 in WTF::Function<void ()>::operator()() const (this=<optimized out>) at ../../Source/WTF/wtf/Function.h:82
#10 WTF::Thread::entryPoint (newThreadContext=0x7fffec02ebb0) at ../../Source/WTF/wtf/Threading.cpp:250
#11 0x0000555558339543 in WTF::wtfThreadEntryPoint (context=0x5555587a53bc) at ../../Source/WTF/wtf/posix/ThreadingPOSIX.cpp:242
#12 0x00007ffff5fd8609 in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#13 0x00007ffff5ba5133 in clone () from /lib/x86_64-linux-gnu/libc.so.6
```

Segment fault when visitng the field of object inlineSignature while it is NULL.

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