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Examples of errors detected by the V100…

Examples of errors detected by the V1001 diagnostic

V1001. The variable is assigned but is not used by the end of the function.


EFL Core Libraries

V1001 The 'address_shadow' variable is assigned but is not used until the end of the function. elocation.c 1122


static Elocation_Address *address = NULL;

EAPI Eina_Bool
elocation_address_get(Elocation_Address *address_shadow)
{
   if (!address) return EINA_FALSE;
   if (address == address_shadow) return EINA_TRUE;

   address_shadow = address;
   return EINA_TRUE;
}

Most likely this is what should be written here: *address_shadow = *address;

Similar errors can be found in some other places:

  • V1001 The 'screen' variable is assigned but is not used until the end of the function. ecore_x_xinerama.c 92
  • V1001 The 'ret' variable is assigned but is not used until the end of the function. edje_edit.c 12774
  • V1001 The 'ret' variable is assigned but is not used until the end of the function. edje_edit.c 15884
  • And 2 additional diagnostic messages.

MuseScore

V1001 The 'ontime' variable is assigned but is not used until the end of the function. rendermidi.cpp 1176


bool renderNoteArticulation(....)
{
  int ontime    = 0;
  ....
  // render the suffix
  for (int j = 0; j < s; j++)
    ontime = makeEvent(suffix[j], ontime, tieForward(j,suffix));
  // render graceNotesAfter
  ontime = graceExtend(note->pitch(), ...., ontime);
  return true;
}

Skia Graphics Engine

V1001 CWE-563 The 'allDone' variable is assigned but is not used until the end of the function. skopcontour.cpp 40


SkOpSpan* SkOpContour::undoneSpan() {
  SkOpSegment* testSegment = &fHead;
  bool allDone = true;
  do {
    if (testSegment->done()) {
      continue;
    }
    allDone = false;
    return testSegment->undoneSpan();
  } while ((testSegment = testSegment->next()));
  if (allDone) {
    fDone = true;
  }
  return nullptr;
}

Very suspicious code, but it is difficult for me to understand what is the actual error here.


XNU kernel

V1001 CWE-563 The 'a' variable is assigned but is not used until the end of the function. sha1mod.c 120


__private_extern__ void
YSHA1Transform(u_int32_t state[5],
               const unsigned char buffer[64])
{
  u_int32_t a, b, c, d, e;
  ....
  state[0] += a;
  state[1] += b;
  state[2] += c;
  state[3] += d;
  state[4] += e;
  /* Wipe variables */
  a = b = c = d = e = 0;
}

The compiler can delete code "a = b = c = d = e = 0;" in terms of optimization.


Android

V1001 CWE-563 The 'a' variable is assigned but is not used until the end of the function. sha1.c 213


void SHA1Transform(uint32_t state[5], const uint8_t buffer[64])
{
  uint32_t a, b, c, d, e;
  ....
  /* Wipe variables */
  a = b = c = d = e = 0;
}

LibreOffice

V1001 The 'DL' variable is assigned but is not used by the end of the function. cipher.cxx 811


static void BF_updateECB(
    CipherContextBF    *ctx,
    rtlCipherDirection  direction,
    const sal_uInt8    *pData,
    sal_uInt8          *pBuffer,
    sal_Size            nLength)
{
    CipherKeyBF *key;
    sal_uInt32   DL, DR;

    key = &(ctx->m_key);
    if (direction == rtl_Cipher_DirectionEncode)
    {
        RTL_CIPHER_NTOHL64(pData, DL, DR, nLength);

        BF_encode(key, &DL, &DR);

        RTL_CIPHER_HTONL(DL, pBuffer);
        RTL_CIPHER_HTONL(DR, pBuffer);
    }
    else
    {
        RTL_CIPHER_NTOHL(pData, DL);
        RTL_CIPHER_NTOHL(pData, DR);

        BF_decode(key, &DL, &DR);

        RTL_CIPHER_HTONL64(DL, DR, pBuffer, nLength);
    }
    DL = DR = 0;
}

Similar errors can be found in some other places:

  • V1001 The 'DL' variable is assigned but is not used by the end of the function. cipher.cxx 860

LLVM/Clang

V1001 [CWE-563] The 'Mode' variable is assigned but is not used by the end of the function. SIModeRegister.cpp 48


struct Status {
  unsigned Mask;
  unsigned Mode;

  Status() : Mask(0), Mode(0){};

  Status(unsigned Mask, unsigned Mode) : Mask(Mask), Mode(Mode) {
    Mode &= Mask;
  };
  ....
};

LLVM/Clang

V1001 [CWE-563] The 'Size' variable is assigned but is not used by the end of the function. Object.cpp 424


class SectionBase {
  ....
  uint64_t Size = 0;
  ....
};

class SymbolTableSection : public SectionBase {
  ....
};

void SymbolTableSection::addSymbol(Twine Name, uint8_t Bind, uint8_t Type,
                                   SectionBase *DefinedIn, uint64_t Value,
                                   uint8_t Visibility, uint16_t Shndx,
                                   uint64_t Size) {
  ....
  Sym.Value = Value;
  Sym.Visibility = Visibility;
  Sym.Size = Size;
  Sym.Index = Symbols.size();
  Symbols.emplace_back(llvm::make_unique<Symbol>(Sym));
  Size += this->EntrySize;
}

TON

V1001 The 'tmp_info' variable is assigned but is not used by the end of the function. analyzer.cpp 140


bool Op::set_var_info_except(const VarDescrList& new_var_info,
                        const std::vector<var_idx_t>& var_list) {
  if (!var_list.size()) {
    return set_var_info(new_var_info);
  }
  VarDescrList tmp_info{new_var_info};
  tmp_info -= var_list;
  return set_var_info(new_var_info);     // <=
}

Zephyr

V1001 The 'len' variable is assigned but is not used by the end of the function. lwm2m_rw_oma_tlv.c 338


static size_t put_end_tlv(struct lwm2m_output_context *out, u16_t mark_pos,
        u8_t *writer_flags, u8_t writer_flag,
        int tlv_type, int tlv_id)
{
  struct tlv_out_formatter_data *fd;
  struct oma_tlv tlv;
  u32_t len = 0U;

  fd = engine_get_out_user_data(out);
  if (!fd) {
    return 0;
  }

  *writer_flags &= ~writer_flag;

  len = out->out_cpkt->offset - mark_pos;

  /* use stored location */
  fd->mark_pos = mark_pos;

  /* set instance length */
  tlv_setup(&tlv, tlv_type, tlv_id, len);
  len = oma_tlv_put(&tlv, out, NULL, true) - tlv.length;

  return 0;
}

Universal

V1001 The 'scaledVector' variable is assigned but is not used by the end of the function. vector.hpp 124


template<typename Scalar>
vector<Scalar> operator*(double scalar, const vector<Scalar>& v) {
  vector<Scalar> scaledVector(v);
  scaledVector *= scalar;
  return v;
}

Similar errors can be found in some other places:

  • V1001 The 'normalizedVector' variable is assigned but is not used by the end of the function. vector.hpp 131

LLVM/Clang

V1001 The 'T' variable is assigned but is not used by the end of the function. CommonArgs.cpp 87


const char *tools::SplitDebugName(const ArgList &Args, const InputInfo &Input,
                                  const InputInfo &Output) {
  if (Arg *A = Args.getLastArg(options::OPT_gsplit_dwarf_EQ))
    if (StringRef(A->getValue()) == "single")
      return Args.MakeArgString(Output.getFilename());

  Arg *FinalOutput = Args.getLastArg(options::OPT_o);
  if (FinalOutput && Args.hasArg(options::OPT_c)) {
    SmallString<128> T(FinalOutput->getValue());
    llvm::sys::path::replace_extension(T, "dwo");
    return Args.MakeArgString(T);
  } else {
    // Use the compilation dir.
    SmallString<128> T(
        Args.getLastArgValue(options::OPT_fdebug_compilation_dir));
    SmallString<128> F(llvm::sys::path::stem(Input.getBaseInput()));
    llvm::sys::path::replace_extension(F, "dwo");
    T += F;
    return Args.MakeArgString(F);       // <=
  }
}

Snort

V1001 The 'ptr' variable is assigned but is not used by the end of the function. spp_sfportscan.c 596


static int PortscanAlertTcp(PS_PROTO *proto, ....)
{
  ....
  int portsweep = 0;

  if (!proto)
    return -1;

  switch (proto->alerts)
  {
  case PS_ALERT_ONE_TO_ONE:
    ....
    break;

  case PS_ALERT_ONE_TO_ONE_DECOY:
    ....
    break;

  case PS_ALERT_PORTSWEEP:
    ....
    portsweep = 1;
    break;

  case PS_ALERT_DISTRIBUTED:
    ....
    break;

  case PS_ALERT_ONE_TO_ONE_FILTERED:
    ....
    break;

  case PS_ALERT_ONE_TO_ONE_DECOY_FILTERED:
    ....
    break;

  case PS_ALERT_PORTSWEEP_FILTERED:
    ....
    portsweep = 1;
    return 0;

  case PS_ALERT_DISTRIBUTED_FILTERED:
    ....
    break;

  default:
    return 0;
  }

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