C中的内存分配运行时错误
我创建了以下代码，一个简单的暴力程序，用于可打印ascii。用户传入起始密码短语长度和结束密码短语长度的参数。当我的程序运行时，出现以下错误： 输入：C中的内存分配运行时错误,c,memory-management,runtime-error,C,Memory Management,Runtime Error,我创建了以下代码，一个简单的暴力程序，用于可打印ascii。用户传入起始密码短语长度和结束密码短语长度的参数。当我的程序运行时，出现以下错误： 输入： ~$ Enter START length & END length ex:(8 10): 2 3 ... (more output above) ~| ~} ~~ *** glibc detected *** ./wordgen: double free or corruption (out): 0x0916e008 *** ===
~$ Enter START length & END length ex:(8 10): 2 3
... (more output above)
~|
~}
~~
*** glibc detected *** ./wordgen: double free or corruption (out): 0x0916e008 ***
======= Backtrace: =========
/lib/i386-linux-gnu/libc.so.6(+0x6cbe1)[0x874be1]
/lib/i386-linux-gnu/libc.so.6(+0x6e50b)[0x87650b]
/lib/i386-linux-gnu/libc.so.6(cfree+0x6d)[0x87969d]
./wordgen[0x80486f4]
/lib/i386-linux-gnu/libc.so.6(__libc_start_main+0xe7)[0x81ee37]
./wordgen[0x8048471]
======= Memory map: ========
00110000-0012a000 r-xp 00000000 08:06 3408733 /lib/i386-linux-gnu/libgcc_s.so.1Aborted
==11050== Invalid read of size 1
==11050== at 0x804866F: main (wordgen.c:37)
==11050== Address 0x41a2027 is 1 bytes before a block of size 3 alloc'd
==11050== at 0x4026864: malloc (vg_replace_malloc.c:236)
==11050== by 0x8048600: main (wordgen.c:28)
==11050==
==11050== Invalid write of size 1
==11050== at 0x8048675: main (wordgen.c:37)
==11050== Address 0x41a2027 is 1 bytes before a block of size 3 alloc'd
==11050== at 0x4026864: malloc (vg_replace_malloc.c:236)
==11050== by 0x8048600: main (wordgen.c:28)
==11050==
==11050== Invalid read of size 1
==11050== at 0x8048689: main (wordgen.c:38)
==11050== Address 0x41a2027 is 1 bytes before a block of size 3 alloc'd
==11050== at 0x4026864: malloc (vg_replace_malloc.c:236)
==11050== by 0x8048600: main (wordgen.c:28)
==11050==
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main(int argc, char *argv[]) {
int sLen = 1;
int eLen = 0;
printf("Enter START length & END length ex:(8 10): ");
scanf("%d %d", &sLen, &eLen);
int cLen = sLen;
while (cLen <= eLen) {
/* Allocate Memory for String & Initialize */
char *outStr = malloc(cLen + 1);
memset(outStr, ' ', cLen);
outStr[cLen] = 0;
int outerControl = 1;
while (outerControl == 1) {
int cMod = 1;
int innerControl = 1;
while(innerControl == 1) {
outStr[cLen-cMod] += 1;
if((int)outStr[cLen-cMod] == 127) {
//Exit Condition Where The Error Occurred
if(cLen - cMod == 0) { outerControl = 0; }
outStr[cLen-cMod] = 32;
cMod += 1;
}
else { innerControl = 0; }
}
printf("%s\n",outStr);
}
free(outStr); // Possible source of Error?
cLen += 1;
}
return 0;
}
~$ Enter START length & END length ex:(8 10): 2 3
... (more output above)
~|
~}
~~
*** glibc detected *** ./wordgen: double free or corruption (out): 0x0916e008 ***
======= Backtrace: =========
/lib/i386-linux-gnu/libc.so.6(+0x6cbe1)[0x874be1]
/lib/i386-linux-gnu/libc.so.6(+0x6e50b)[0x87650b]
/lib/i386-linux-gnu/libc.so.6(cfree+0x6d)[0x87969d]
./wordgen[0x80486f4]
/lib/i386-linux-gnu/libc.so.6(__libc_start_main+0xe7)[0x81ee37]
./wordgen[0x8048471]
======= Memory map: ========
00110000-0012a000 r-xp 00000000 08:06 3408733 /lib/i386-linux-gnu/libgcc_s.so.1Aborted
==11050== Invalid read of size 1
==11050== at 0x804866F: main (wordgen.c:37)
==11050== Address 0x41a2027 is 1 bytes before a block of size 3 alloc'd
==11050== at 0x4026864: malloc (vg_replace_malloc.c:236)
==11050== by 0x8048600: main (wordgen.c:28)
==11050==
==11050== Invalid write of size 1
==11050== at 0x8048675: main (wordgen.c:37)
==11050== Address 0x41a2027 is 1 bytes before a block of size 3 alloc'd
==11050== at 0x4026864: malloc (vg_replace_malloc.c:236)
==11050== by 0x8048600: main (wordgen.c:28)
==11050==
==11050== Invalid read of size 1
==11050== at 0x8048689: main (wordgen.c:38)
==11050== Address 0x41a2027 is 1 bytes before a block of size 3 alloc'd
==11050== at 0x4026864: malloc (vg_replace_malloc.c:236)
==11050== by 0x8048600: main (wordgen.c:28)
==11050==
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main(int argc, char *argv[]) {
int sLen = 1;
int eLen = 0;
printf("Enter START length & END length ex:(8 10): ");
scanf("%d %d", &sLen, &eLen);
int cLen = sLen;
while (cLen <= eLen) {
/* Allocate Memory for String & Initialize */
char *outStr = malloc(cLen + 1);
memset(outStr, ' ', cLen);
outStr[cLen] = 0;
int outerControl = 1;
while (outerControl == 1) {
int cMod = 1;
int innerControl = 1;
while(innerControl == 1) {
outStr[cLen-cMod] += 1;
if((int)outStr[cLen-cMod] == 127) {
//Exit Condition Where The Error Occurred
if(cLen - cMod == 0) { outerControl = 0; }
outStr[cLen-cMod] = 32;
cMod += 1;
}
else { innerControl = 0; }
}
printf("%s\n",outStr);
}
free(outStr); // Possible source of Error?
cLen += 1;
}
return 0;
}
~$ Enter START length & END length ex:(8 10): 2 3
... (more output above)
~|
~}
~~
*** glibc detected *** ./wordgen: double free or corruption (out): 0x0916e008 ***
======= Backtrace: =========
/lib/i386-linux-gnu/libc.so.6(+0x6cbe1)[0x874be1]
/lib/i386-linux-gnu/libc.so.6(+0x6e50b)[0x87650b]
/lib/i386-linux-gnu/libc.so.6(cfree+0x6d)[0x87969d]
./wordgen[0x80486f4]
/lib/i386-linux-gnu/libc.so.6(__libc_start_main+0xe7)[0x81ee37]
./wordgen[0x8048471]
======= Memory map: ========
00110000-0012a000 r-xp 00000000 08:06 3408733 /lib/i386-linux-gnu/libgcc_s.so.1Aborted
==11050== Invalid read of size 1
==11050== at 0x804866F: main (wordgen.c:37)
==11050== Address 0x41a2027 is 1 bytes before a block of size 3 alloc'd
==11050== at 0x4026864: malloc (vg_replace_malloc.c:236)
==11050== by 0x8048600: main (wordgen.c:28)
==11050==
==11050== Invalid write of size 1
==11050== at 0x8048675: main (wordgen.c:37)
==11050== Address 0x41a2027 is 1 bytes before a block of size 3 alloc'd
==11050== at 0x4026864: malloc (vg_replace_malloc.c:236)
==11050== by 0x8048600: main (wordgen.c:28)
==11050==
==11050== Invalid read of size 1
==11050== at 0x8048689: main (wordgen.c:38)
==11050== Address 0x41a2027 is 1 bytes before a block of size 3 alloc'd
==11050== at 0x4026864: malloc (vg_replace_malloc.c:236)
==11050== by 0x8048600: main (wordgen.c:28)
==11050==
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main(int argc, char *argv[]) {
int sLen = 1;
int eLen = 0;
printf("Enter START length & END length ex:(8 10): ");
scanf("%d %d", &sLen, &eLen);
int cLen = sLen;
while (cLen <= eLen) {
/* Allocate Memory for String & Initialize */
char *outStr = malloc(cLen + 1);
memset(outStr, ' ', cLen);
outStr[cLen] = 0;
int outerControl = 1;
while (outerControl == 1) {
int cMod = 1;
int innerControl = 1;
while(innerControl == 1) {
outStr[cLen-cMod] += 1;
if((int)outStr[cLen-cMod] == 127) {
//Exit Condition Where The Error Occurred
if(cLen - cMod == 0) { outerControl = 0; }
outStr[cLen-cMod] = 32;
cMod += 1;
}
else { innerControl = 0; }
}
printf("%s\n",outStr);
}
free(outStr); // Possible source of Error?
cLen += 1;
}
return 0;
}
~$ Enter START length & END length ex:(8 10): 2 3
... (more output above)
~|
~}
~~
*** glibc detected *** ./wordgen: double free or corruption (out): 0x0916e008 ***
======= Backtrace: =========
/lib/i386-linux-gnu/libc.so.6(+0x6cbe1)[0x874be1]
/lib/i386-linux-gnu/libc.so.6(+0x6e50b)[0x87650b]
/lib/i386-linux-gnu/libc.so.6(cfree+0x6d)[0x87969d]
./wordgen[0x80486f4]
/lib/i386-linux-gnu/libc.so.6(__libc_start_main+0xe7)[0x81ee37]
./wordgen[0x8048471]
======= Memory map: ========
00110000-0012a000 r-xp 00000000 08:06 3408733 /lib/i386-linux-gnu/libgcc_s.so.1Aborted
==11050== Invalid read of size 1
==11050== at 0x804866F: main (wordgen.c:37)
==11050== Address 0x41a2027 is 1 bytes before a block of size 3 alloc'd
==11050== at 0x4026864: malloc (vg_replace_malloc.c:236)
==11050== by 0x8048600: main (wordgen.c:28)
==11050==
==11050== Invalid write of size 1
==11050== at 0x8048675: main (wordgen.c:37)
==11050== Address 0x41a2027 is 1 bytes before a block of size 3 alloc'd
==11050== at 0x4026864: malloc (vg_replace_malloc.c:236)
==11050== by 0x8048600: main (wordgen.c:28)
==11050==
==11050== Invalid read of size 1
==11050== at 0x8048689: main (wordgen.c:38)
==11050== Address 0x41a2027 is 1 bytes before a block of size 3 alloc'd
==11050== at 0x4026864: malloc (vg_replace_malloc.c:236)
==11050== by 0x8048600: main (wordgen.c:28)
==11050==
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main(int argc, char *argv[]) {
int sLen = 1;
int eLen = 0;
printf("Enter START length & END length ex:(8 10): ");
scanf("%d %d", &sLen, &eLen);
int cLen = sLen;
while (cLen <= eLen) {
/* Allocate Memory for String & Initialize */
char *outStr = malloc(cLen + 1);
memset(outStr, ' ', cLen);
outStr[cLen] = 0;
int outerControl = 1;
while (outerControl == 1) {
int cMod = 1;
int innerControl = 1;
while(innerControl == 1) {
outStr[cLen-cMod] += 1;
if((int)outStr[cLen-cMod] == 127) {
//Exit Condition Where The Error Occurred
if(cLen - cMod == 0) { outerControl = 0; }
outStr[cLen-cMod] = 32;
cMod += 1;
}
else { innerControl = 0; }
}
printf("%s\n",outStr);
}
free(outStr); // Possible source of Error?
cLen += 1;
}
return 0;
}
#包括
#包括
#包括
int main（int argc，char*argv[]）{
int-sLen=1；
int-eLen=0；
printf（“输入起始长度和结束长度ex:（8 10）：”；
scanf（“%d%d”，&sLen，&eLen）；
int-cLen=sLen；
while（cLen你在你的的每一次传球中都有自由的出击）while（cLen你在的每一次传球中都有自由的出击）while（cLen你的问题是：
while(innerControl == 1) {
printf("%d %d\n", cLen, cMod);
outStr[cLen-cMod] += 1; // <-- this here
if((int)outStr[cLen-cMod] == 127) {
//Exit Condition Where The Error Occurred
if(cLen - cMod == 0) { outerControl = 0; }
outStr[cLen-cMod] = 32;
cMod += 1;
}
else { innerControl = 0; }
}
…似乎是为了防止出现这种情况，但只有在（int）outtr[cLen cMod]==127时才会执行。您可能应该添加如下内容：
if (cMod > cLen)
break;
outStr[cLen-cMod] += 1;
你的问题是：
while(innerControl == 1) {
printf("%d %d\n", cLen, cMod);
outStr[cLen-cMod] += 1; // <-- this here
if((int)outStr[cLen-cMod] == 127) {
//Exit Condition Where The Error Occurred
if(cLen - cMod == 0) { outerControl = 0; }
outStr[cLen-cMod] = 32;
cMod += 1;
}
else { innerControl = 0; }
}
…似乎是为了防止出现这种情况，但只有在（int）outtr[cLen cMod]==127时才会执行。您可能应该添加如下内容：
if (cMod > cLen)
break;
outStr[cLen-cMod] += 1;
尝试使用-Wall-g
参数编译并使用valgrind
。我确实使用了valgrind，它抑制了运行时错误。当我在没有valgrind的情况下运行时，出现了错误。尝试使用-Wall-g
参数编译并使用valgrind
。我确实使用了valgrind，它抑制了运行时错误。当我在没有valgrind的情况下运行时，它抑制了运行时错误错误发生了。我真的发现了这一点，回来创建答案，你已经发布了；）将条件更改为如果（cLen-cMod==0）{outerControl=0；innerControl=0；}
@awashburn:你把我错当成了别人，我没有编辑答案；-，不管怎样，很高兴你找到了它。：）我真的刚刚弄明白了这一点，回来创建了答案，你已经发布了；）将条件更改为如果（cLen-cMod==0）{outerControl=0；innerControl=0；}
@awashburn:你把我错当成别人了，我没有编辑答案；-，不管怎样，很高兴你找到了。：）