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  1. Qt
  2. QTBUG-111740

Corelib text function fromLatin1 corrupted output

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    • Icon: Bug Bug
    • Resolution: Unresolved
    • Icon: P1: Critical P1: Critical
    • None
    • 5.15.8, 6.4.2
    • Core: QString and Unicode
    • None
    • os: OpenWrt 22.03.0 // mipsel_24kc // ramips/mt7621 // Xiaomi R3G
      cross compiled on Linux debian 5.10.0-21-amd64 #1 SMP Debian 5.10.162-1 (2023-01-21) x86_64 GNU/Linux

      QString::fromLatin1 produces corrupted output in the case source address is misaligned by uneven number. Every 8th character gets 'randomly' replaced. Actually only first occurrence is random and the replacing char comes from the string being converted at offset of -11

      The culprit is:

      qtbase/src/corelib/text/qstring_mips_dsp_asm.S:326

      #if defined(__mips_dspr2)
          prepend t1, t2, 8
      #else
          sll    t4, t4, 24
          srl    t1, t1, 8
          or     t1, t1, t4
      #endif

       

      The correct is:

      sll t4, t2, 24

       

       

       

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            thiago Thiago Macieira
            pikappa Adam Wroński
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              Created:
              Updated:

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