Examples of errors detected by the V649 diagnostic

V649. Two 'if' statements with identical conditional expressions. The first 'if' statement contains function return. This means that the second 'if' statement is senseless.

RunAsAdmin Explorer Shim

V649 There are two 'if' statements with identical conditional expressions. The first 'if' statement contains function return. This means that the second 'if' statement is senseless. Check lines: 67, 70. cannonical_xml.h 70


class xmlInputCharData {
public:
  static bool isBaseChar(wchar_t l) {
    ....
    if (l >= 0x06BA && l <= 0x06BE) return true;
    if (l >= 0x06C0 && l <= 0x06CE) return true;
    if (l >= 0x06D0 && l <= 0x06D3) return true;
    if (l == 0x06D5) return true;                  // <=
    if (l >= 0x06E5 && l <= 0x06E6) return true;
    if (l >= 0x0905 && l <= 0x0939) return true;
    if (l == 0x06D5) return true;                  // <=
    if (l >= 0x0958 && l <= 0x0961) return true;
    if (l >= 0x0985 && l <= 0x098C) return true;
    if (l >= 0x098F && l <= 0x0990) return true;
    ....
  }

Miranda IM


int CLUIFramesGetalClientFrame(void)
{
  int i;

  if(alclientFrame!=-1)
    return alclientFrame;

  if(alclientFrame!=-1)
  {
    /* this value could become invalid if RemoveItemFromList
     * was called, so we double-check */
    ....
  }
}

Similar errors can be found in some other places:

V649 There are two 'if' statements with identical conditional expressions. The first 'if' statement contains function return. This means that the second 'if' statement is senseless. Check lines: 147, 148. init.c 148
V649 There are two 'if' statements with identical conditional expressions. The first 'if' statement contains function return. This means that the second 'if' statement is senseless. Check lines: 909, 915. icq_direct.cpp 915
V649 There are two 'if' statements with identical conditional expressions. The first 'if' statement contains function return. This means that the second 'if' statement is senseless. Check lines: 343, 347. jabber_rc.cpp 347

Wolfenstein 3D


#define REFLAG_FULL_LOD     8   // force a FULL lod
#define REFLAG_FORCE_LOD    8   // force a low lod

float R_CalcMDSLod(....)
{
  ....
  if ( refent->reFlags & REFLAG_FULL_LOD )
  {
    return 1.0f;
  }
  ....
  if ( refent->reFlags & REFLAG_FORCE_LOD )
  {
    flod *= 0.5;
  }
  ....
}

Coin3D


int
SbProfilingData::operator == (const SbProfilingData & rhs) const
{
  if (this->actionType != rhs.actionType) return FALSE;
  if (this->actionStartTime != rhs.actionStopTime) return FALSE;
  if (this->actionStartTime != rhs.actionStopTime) return FALSE;
  ....
}

Micro-Manager


int AFC::Initialize()
{
  int ret = DEVICE_OK;
  ....
  if (ret != DEVICE_OK)
    return ret;
  AddAllowedValue("DichroicMirrorIn", "0", 0);
  AddAllowedValue("DichroicMirrorIn", "1", 1);
  if (ret != DEVICE_OK)
    return ret;
  ....
}

Not terrible, but second if() does not make sense.

Similar errors can be found in some other places:

V649 There are two 'if' statements with identical conditional expressions. The first 'if' statement contains function return. This means that the second 'if' statement is senseless. Check lines: 192, 198. AAAOTF.cpp 198
V649 There are two 'if' statements with identical conditional expressions. The first 'if' statement contains function return. This means that the second 'if' statement is senseless. Check lines: 507, 513. AAAOTF.cpp 513
V649 There are two 'if' statements with identical conditional expressions. The first 'if' statement contains function return. This means that the second 'if' statement is senseless. Check lines: 1060, 1073. LeicaDMI.cpp 1073
And 12 additional diagnostic messages.

Blender


bool BKE_ffmpeg_alpha_channel_is_supported(RenderData *rd)
{
    int codec = rd->ffcodecdata.codec;
    if (codec == AV_CODEC_ID_QTRLE)
        return true;
    if (codec == AV_CODEC_ID_PNG)
        return true;
    if (codec == AV_CODEC_ID_PNG)
        return true;
    ....
}

Blender


static void writedata_do_write(....)
{
  if ((wd == NULL) || wd->error ||
      (mem == NULL) || memlen < 1) return;
  if (wd->error) return;
  ....
}

LLVM/Clang


static bool print_class_ro64_t(....) {
  ....
  const char *r;
  uint32_t offset, xoffset, left;
  ....
  r = get_pointer_64(p, offset, left, S, info);
  if (r == nullptr || left < sizeof(struct class_ro64_t))   // <=
    return false;                                           // <=
  memset(&cro, '\0', sizeof(struct class_ro64_t));
  if (left < sizeof(struct class_ro64_t)) {                 // <=
    memcpy(&cro, r, left);
    outs() << "   (class_ro_t entends past the .......)\n";
  } else
    memcpy(&cro, r, sizeof(struct class_ro64_t));
  ....
}

EFL Core Libraries


static Eina_Bool
_ecore_con_cl_handler(void *data,
                      Ecore_Fd_Handler *fd_handler)
{
   Ecore_Con_Server *obj = data;
   Eina_Bool want_read, want_write;
   Ecore_Con_Server_Data *svr =
     eo_data_scope_get(obj, ECORE_CON_SERVER_CLASS);

   if (svr->delete_me)
     return ECORE_CALLBACK_RENEW;

   if (svr->delete_me)
     return ECORE_CALLBACK_RENEW;
  ....
}

Chromium

V649 CWE-561 There are two 'if' statements with identical conditional expressions. The first 'if' statement contains function return. This means that the second 'if' statement is senseless. Check lines: 67, 71. tsf_input_scope.cc 71


STDMETHOD(GetInputScopes)(InputScope** input_scopes,
                          UINT* count) override
{
  if (!count || !input_scopes)
    return E_INVALIDARG;
  *input_scopes = static_cast<InputScope*>(CoTaskMemAlloc(
      sizeof(InputScope) * input_scopes_.size()));
  if (!input_scopes) {
    *count = 0;
    return E_OUTOFMEMORY;
  }
  ....
}

Most likely, a developer forgot to dereference a pointer and the code should actually look like this: if (!*input_scopes) {

Skia Graphics Engine


bool SkPathRef::isValid() const {
  ....
  if (nullptr == fPoints && 0 != fFreeSpace) {
    return false;
  }
  if (nullptr == fPoints && 0 != fFreeSpace) {
    return false;
  }
  ....
}

The same check is performed twice. Or the second check is redundant. Or one forgot to check out something else.

LibreOffice


STDMETHODIMP CAccTable::get_columnDescription(long column, BSTR * description)
{
    SolarMutexGuard g;

    ENTER_PROTECTED_BLOCK

    // #CHECK#
    if(description == nullptr)
        return E_INVALIDARG;

    // #CHECK XInterface#
    if(!pRXTable.is())
        return E_FAIL;
    ....
    SAFE_SYSFREESTRING(*description);
    *description = SysAllocString(o3tl::toW(ouStr.getStr()));
    if(description==nullptr) // <=
        return E_FAIL;
    return S_OK;

    LEAVE_PROTECTED_BLOCK
}

Similar errors can be found in some other places:

V649 There are two 'if' statements with identical conditional expressions. The first 'if' statement contains function return. This means that the second 'if' statement is senseless. Check lines: 344, 356. acctable.cxx 356
V649 There are two 'if' statements with identical conditional expressions. The first 'if' statement contains function return. This means that the second 'if' statement is senseless. Check lines: 213, 219. trvlfrm.cxx 219

CodeLite


bool clTreeCtrlModel::GetRange(....) const
{
  items.clear();

  if (from == nullptr || to == nullptr)
  {
    return false;
  }

  if (from == nullptr)
  {
    items.push_back(to);
    return true;
  }

  if (to == nullptr)
  {
    items.push_back(from);
    return true;
  }
  ....
}

Similar errors can be found in some other places:

V649 There are two 'if' statements with identical conditional expressions. The first 'if' statement contains function return. This means that the second 'if' statement is senseless. Check lines: 1998, 2000. ShapeCanvas.cpp:2000, ShapeCanvas.cpp:1998

Examples of errors detected by the V649 diagnostic

RunAsAdmin Explorer Shim

Miranda IM

Wolfenstein 3D

Coin3D

Micro-Manager

Blender

Blender

LLVM/Clang

EFL Core Libraries

Chromium

Skia Graphics Engine

LibreOffice

CodeLite

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