[I] BUG: SIGABRT in quantiles_sketch::deserialize(): dereferencing empty std::optional (libc++ verbose_abort) [datasketches-cpp]

["MaheshGPai (via GitHub)" <gi...@apache.org>]

MaheshGPai opened a new issue, #477:
URL: https://github.com/apache/datasketches-cpp/issues/477

   
   Some deserialization paths use `std::optional<T> tmp;` as if it were “allocated but uninitialized storage” and then pass `&*tmp` to `serde::deserialize(...)`. When `tmp` is disengaged, `operator*` is undefined behavior; with libc++ hardening enabled it triggers an assertion and aborts the process (SIGABRT).
   
   This results in **process termination** instead of a normal error (exception) when deserializing malformed/short buffers (and potentially other edge cases).
   
   ## Expected behavior
   
   Deserialization should either:
   - succeed, or
   - throw/return a normal error (e.g. `std::invalid_argument`, `std::runtime_error`)
   
   It should **not** abort the process.
   
   ## Actual behavior
   
   With libc++ hardening enabled, the process aborts with:
   
   - `optional operator* called on a disengaged value`
   - `Abort trap: 6` / SIGABRT
   
   The abort points to `std::optional<T>::operator*` used on an empty optional.


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Re: [I] BUG: SIGABRT in quantiles_sketch::deserialize(): dereferencing empty std::optional (libc++ verbose_abort) [datasketches-cpp]

["leerho (via GitHub)" <gi...@apache.org>]

leerho closed issue #477: BUG: SIGABRT in quantiles_sketch::deserialize(): dereferencing empty std::optional (libc++ verbose_abort)
URL: https://github.com/apache/datasketches-cpp/issues/477


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