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avoid use of uninitialized value in tdefl_record_literal

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In tdefl_record_literal, the following expression may read an uninitialized
value in the m_pLZ_flags field:

*d->m_pLZ_flags = (mz_uint8)(*d->m_pLZ_flags >> 1);

By explicitly initializing it, we avoid possible undefined behaviors.
Issue found with Frama-C.
This commit is contained in:
Andre Maroneze
2021-05-25 15:23:35 +02:00
parent 9edb278d22
commit cf2833fdc1
1 changed files with 1 additions and 0 deletions
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miniz_tdef.c
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@@ -1333,6 +1333,7 @@ tdefl_status tdefl_init(tdefl_compressor *d, tdefl_put_buf_func_ptr pPut_buf_fun
d->m_output_flush_ofs = d->m_output_flush_remaining = d->m_finished = d->m_block_index = d->m_bit_buffer = d->m_wants_to_finish = 0;
d->m_pLZ_code_buf = d->m_lz_code_buf + 1;
d->m_pLZ_flags = d->m_lz_code_buf;
*d->m_pLZ_flags = 0;
d->m_num_flags_left = 8;
d->m_pOutput_buf = d->m_output_buf;
d->m_pOutput_buf_end = d->m_output_buf;