问Valgrind内存泄漏日志

EN

==15788== 480 bytes in 20 blocks are definitely lost in loss record 5,016 of 5,501    

==20901== 112 (48 direct, 64 indirect) bytes in 2 blocks are definitely lost in loss record 3,501 of 5,122 

==20901== 1,375,296 bytes in 78 blocks are possibly lost in loss record 5,109 of 5,122

==20901== Conditional jump or move depends on uninitialised value(s)    

==20901== Use of uninitialised value of size 8

char *data = new char[somebigSize];
memset(data, '\0', somebigSize);
int sizeInt = sizeof(int);
int length = 20; //some value obtained
int position = 10; 
char *newPtrVar = new char[sizeInt + 1];
memset(newPtrVar, '\0', sizeInt + 1);
memcpy(newPtrVar, &length, sizeInt);
memcpy(&data[position], newPtrVar, sizeInt);