Pointer übergabe führt zum Absturz?

int8_t srchCmd(char *inBuff, char *srchCmd)

{

     char *cmdBeginn   = NULL;

     char *cmdEnd       = NULL;

     char *rawData    = NULL;    

   char cmdStrLen      = strlen(srchCmd);

   char inBuffStrLen  = strlen(inBuff);

   char rawData_    = 0;

   if(inBuffStrLen < cmdStrLen)

   return -1;

   /*

   *  how much raw data we will received?

   */

   rawData = strchr(srchCmd,'x');   

   if(rawData != NULL)

   {

     while(*rawData++ == 'x'){rawData_++;}

   }

     /*

     *    search first character from our string without nx

     */

   char *cmdBeginn_ = malloc(sizeof(char)*cmdStrLen);

   strcpy(cmdBeginn_,srchCmd);

     /*

     *  mask the nx out

     */ 

   cmdBeginn_ += (cmdStrLen-rawData_);

     *cmdBeginn_ = '\0';

     cmdBeginn_ -= (cmdStrLen-rawData_);

     cmdBeginn = strstr(inBuff,cmdBeginn_);

   if(cmdBeginn == NULL)

     return -2;

     /*

     *    search last character from our string

     */     

     cmdEnd = strrchr(cmdBeginn,cmdBeginn_[cmdStrLen-rawData_]);

     if(cmdEnd == NULL)

     return -3;

     /*

     *    terminate end of serached string

     */

     cmdBeginn+=cmdStrLen;

     *cmdBeginn = '\0';

     cmdBeginn-=cmdStrLen;

     /*

     *    copy the command to "inBuff"

     */

     strcpy(inBuff,cmdBeginn);

     return 0;

}

int main(int argc, char *argv[]){

  char *inBuff = "+ADDR:1234:56:abcdef";  

  printf("Function Result.: %d\r\n",srchCmd(inBuff,"+ADDR:xxxxxxxxxxxxxx"));

  return 0;

}

int main(int argc, char *argv[]){

  char *inBuff = malloc(sizeof(char)*50);

  strcpy(inBuff,"+ADDR:1234:56:abcdef");

  printf("Function Result.: %d\r\n",srchCmd(inBuff,"+ADDR:xxxxxxxxxxxxxx"));

  printf(getBlthAddr(inBuff));

  return 0;

}

... srchCmd(char *inBuff, const char* const srchCmd)...