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buffer: properly apply dst offset and src length on fast path #54391

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Aug 15, 2024
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buffer: properly apply dst offset and src length on fast path #54391

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7 changes: 4 additions & 3 deletions src/node_buffer.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -1479,11 +1479,12 @@ uint32_t FastWriteString(Local<Value> receiver,
CHECK(offset <= dst.length());
CHECK(dst.length() - offset <= std::numeric_limits<uint32_t>::max());

max_length = std::min<uint32_t>(dst.length() - offset, max_length);
const auto size = std::min(
{static_cast<uint32_t>(dst.length() - offset), max_length, src.length});

memcpy(dst_data, src.data, max_length);
memcpy(dst_data + offset, src.data, size);

return max_length;
return size;
}

static v8::CFunction fast_write_string(v8::CFunction::Make(FastWriteString));
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