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Fix issue#2445 Null Pointer Deref #2461

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Fix issue#2445 Null Pointer Deref #2461

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haruki3hhh
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Fix issue 2445:
#2445

sbc100
sbc100 reviewed Sep 11, 2024
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src/wast-parser.cc
@@ -3439,7 +3439,11 @@ Result WastParser::ParseModuleCommand(Script* script, CommandPtr* out_command) {
error.loc.offset, error.message.c_str());
}
}
*module = std::move(*m.get());
if (m) {
*module = std::move(*m.get());
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Is it possible for ParseWatModule above to succeed without *m being set?

Would this work instead:

if (errors.length()) { 
  return Result::Error;
}
assert(*m);

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doesn't ParseWatModule also return a Result? probably a good idea to check that instead.

@haruki3hhh
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Hi,
After adding this patch, execute the poc, it shows:

# ./wat2wasm ../@POC@
../@POC@:1:2: error: error in quoted module: @0x100000001: unexpected token "|", expected a module field or a module.
(module quote "\7c")
 ^^^^^^

And ASAN is not triggered.

Do you think we should make some further improvements about it?
I'm glad to do it, if needed.

@sbc100
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sbc100 commented Sep 11, 2024

It would be good to add that as a test case I think. Seems like the kind of test that could also be upstreamed to the wasm spec test suite too (once it lands here).

@haruki3hhh
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If I want to add it into test case, should I directly add a .txt file to https://github.com/WebAssembly/wabt/tree/main/test/parse?

@haruki3hhh
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@sbc100 @SoniEx2 Hi folks, I added a testcase, could you also please take a look at it?

https://github.com/WebAssembly/wabt/pull/2461/files#diff-198b0c14be90b6dbd98ff0d8d3289a686f4daa9733c748db3dadfaa5c55635fd

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SoniEx2 commented Sep 15, 2024 •
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the test looks great. wonder if it would make sense to upstream it...

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@haruki3hhh @sbc100 @SoniEx2