Fix crash entering secret level with music on, and no songs
If music is configured as built-in, and no secret songs are configured,
then BIMSecretSongs is set to a non-null pointer to a zero-element
array. This triggers a divide-by-zero when the array length is used in
a modulus operation.
Fix this by adding a special case that initializing from an empty vector
calls `reset()`, which causes the underlying unique_ptr to store
`nullptr` instead of `new bim_song_info[0]`.
Reported-by: Daniel-Leontiev <https://github.com/dxx-rebirth/dxx-rebirth/issues/465>
Fixes: c355e207fe
("Refactor song loading")
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@ -83,6 +83,20 @@ public:
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void user_configured_level_songs::operator=(std::vector<bim_song_info> &&v)
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{
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if (v.empty())
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{
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/* If the vector is empty, use `reset` so that this object
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* stores `nullptr` instead of a pointer to a zero-length array.
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* Storing `nullptr` causes `operator bool()` to return false.
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* Storing a zero-length array causes `operator bool()` to
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* return true.
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*
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* A true return causes a divide-by-zero later when the object
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* is considered true, but then reports a length of zero.
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*/
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reset();
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return;
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}
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resize(v.size());
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std::move(v.begin(), v.end(), &this->operator[](0u));
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}
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