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LibWasm: Limit the number of function locals

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It's possible for the module to request too many locals, we now reject
such modules instead of trying to allocate space for them.
The value itself is chosen arbitrarily, so future tweaks _might_ be
necessary.
Found by OSS-Fuzz: https://oss-fuzz.com/testcase?key=4755809098661888
This commit is contained in:
Ali Mohammad Pur 2021-08-30 23:37:29 +04:30 • committed by Andreas Kling
parent 05c65f9b5d
commit b64d6bb3a3
2 changed files with 5 additions and 1 deletions
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5
Userland/Libraries/LibWasm/Parser/Parser.cpp
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@ -1091,7 +1091,10 @@ ParseResult<Locals> Locals::parse(InputStream& stream)
size_t count;
if (!LEB128::read_unsigned(stream, count))
return with_eof_check(stream, ParseError::InvalidSize);
// TODO: Disallow too many entries.
if (count > Constants::max_allowed_function_locals_per_type)
return with_eof_check(stream, ParseError::HugeAllocationRequested);
auto type = ValueType::parse(stream);
if (type.is_error())
return type.error();