小编Gre*_*per的帖子

我有以下代码：

#include <stdlib.h>

#define STRING_LENGTH 50

typedef struct entry {
    char name[STRING_LENGTH];
} datum;

int main(void) {
    datum *entries = NULL;
    entries = (datum*) malloc(sizeof(datum)) ;
    char *buffer_ = (char*) malloc(1);
    free(buffer_);
    void *hz = realloc(entries , 2 * sizeof(datum));
    free(entries);

    return 0;
}

但是，如果我编译此代码并运行二进制文件，则会出现以下错误：

*** Error in `./a.out': double free or corruption (fasttop): 0x00005572b0381010 ***
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x70bfb)[0x7ff4b3842bfb]
/lib/x86_64-linux-gnu/libc.so.6(+0x76fc6)[0x7ff4b3848fc6]
/lib/x86_64-linux-gnu/libc.so.6(+0x7780e)[0x7ff4b384980e]
./a.out(+0x799)[0x5572af4ca799]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf1)[0x7ff4b37f22e1]
./a.out(+0x63a)[0x5572af4ca63a]
======= Memory map: ========
5572af4ca000-5572af4cb000 r-xp 00000000 00:29 13267238517                a.out
5572af6ca000-5572af6cb000 r--p 00000000 00:29 13267238517 …