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Examples of errors detected by the V526…

Examples of errors detected by the V526 diagnostic

V526. The 'strcmp' function returns 0 if corresponding strings are equal. Consider inspecting the condition for mistakes.


wxWidgets

V526 The 'strcmp' function returns 0 if corresponding strings are equal. Consider examining the condition for mistakes. wxscintilla lexerlang.cxx 204


static void ColouriseErlangDoc(....) {
{
  ....
  } else if (erlangBIFs.InList(cur)
             && strcmp(cur,"erlang:")){
    style = SCE_ERLANG_BIFS;
  }
  ....
}

Everywhere in the other files a construct of the strcmp() == 0 or strcmp() != 0 kind is used. Most likely this is what should be written here: strcmp(cur,"erlang:") == 0


Network Security Services (NSS)

V526 The 'memcmp' function returns 0 if corresponding buffers are equal. Consider examining the condition for mistakes. ssl3con.c 10533


static SECStatus
ssl3_SendEncryptedExtensions(sslSocket *ss)
{
  static const unsigned char P256_SPKI_PREFIX[] = {
    0x30, 0x59, 0x30, 0x13, 0x06, 0x07, 0x2a, 0x86,
    0x48, 0xce, 0x3d, 0x02, 0x01, 0x06, 0x08, 0x2a,
    0x86, 0x48, 0xce, 0x3d, 0x03, 0x01, 0x07, 0x03,
    0x42, 0x00, 0x04
  };
  ....
  if (.... ||
      memcmp(spki->data, P256_SPKI_PREFIX,
             sizeof(P256_SPKI_PREFIX) != 0))
  {
    PORT_SetError(SSL_ERROR_INVALID_CHANNEL_ID_KEY);
    rv = SECFailure;
    goto loser;
  }
  ....
}

This is what should have been written here: memcmp(spki->data, P256_SPKI_PREFIX, sizeof(P256_SPKI_PREFIX)) != 0)


PostgreSQL Database Management System

V526 The 'memcmp' function returns 0 if corresponding buffers are equal. Consider examining the condition for mistakes. postgres pgstatfuncs.c 712


Datum
pg_stat_get_activity(PG_FUNCTION_ARGS)
{
  ....
  if (memcmp(&(beentry->st_clientaddr), &zero_clientaddr,
             sizeof(zero_clientaddr) == 0))
  ....
}

Similar errors can be found in some other places:

  • V526 The 'memcmp' function returns 0 if corresponding buffers are equal. Consider examining the condition for mistakes. postgres pgstatfuncs.c 976
  • V526 The 'memcmp' function returns 0 if corresponding buffers are equal. Consider examining the condition for mistakes. postgres pgstatfuncs.c 1023

Micro-Manager

V526 The 'memcmp' function returns 0 if corresponding buffers are equal. Consider examining the condition for mistakes. MotorStage.cpp 385


const unsigned char stopSgn[2] = {0x04, 0x66};

int MotorStage::Stop()
{
  ....
  if (memcmp(stopSgn, answer, sizeof(stopSgn) != 0))
    return ERR_UNRECOGNIZED_ANSWER;
  ....
}

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