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“Buffer Overflow - Array Index Out of Bounds” when arrays sizes are correctly managed

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-3

1

I'm getting "Buffer Overflow - Array Index Out of Bounds" for the following code :

typedef struct 
 char apn[100 + 1];
 char user[22 + 1];
 char pass[22 + 1];
 GprsParam_t;
typedef struct IfConfig_s 
 Eth_t eth;
 Gprs_t gprs;
 Wifi_t wifi;
 IfConfig_t;
typedef struct 
 char apn[64];
 char user[32];
 char pass[16];
 Gprs_t;
gprsParam_t accessPoint;
memset(accessPoint, 0x00, sizeof(accessPoint);
memcpy(accessPoint.apn, gprs.accessPoint.apn, sizeof(accessPoint.apn));

I'm trying to copy the value of apn in Gprs_t struct to apn in gprsParam_t
when the sizeof accessPoint.apn is 100 while the sizeof gprs.accessPoint.apn is 64. but it's causing klockwork issue :
Array 'apn' of size 64 may use index value(s) 64..100

I need help understanding this issue.

c buffer-overflow klocwork

share|improve this question

edited Mar 22 at 8:48

kessi

asked Mar 22 at 8:39

kessikessi

14212

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  What is accessPoint.apn? What is gprs.accessPoint.apn? Please create a Minimal, Complete, and Verifiable example that replicates your problem to show us. Also please take some time to refresh how to ask good questions, as well as this question checklist.
  
  – Some programmer dude
  Mar 22 at 8:40
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  We need to see a Minimal, Complete, and Verifiable example for this problem.
  
  – Sourav Ghosh
  Mar 22 at 8:40
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Your compiler is informing you that you are copying bytes beyond the limits of gprs.accessPoint.apn into accessPoint.apn. Try memcpy(accessPoint.apn, gprs.accessPoint.apn, sizeof(accessPoint.apn)<sizeof(gprs.accessPoint.apn)?sizeof(accessPoint.apn):sizeof(gprs.accessPoint.apn));
  
  – Gunther Schulz
  Mar 22 at 8:44
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  it's not a compilation error it's risen from klocwork static
  
  – kessi
  Mar 22 at 8:55
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The message is rather straight forward. You access the smaller array with the length of the larger array. You need to use the minimum of both sizes and handle the extra elements in the destination separately.
  
  – Gerhardh
  Mar 22 at 11:31
  

  
  
  
  

add a comment | 

-3

1

I'm getting "Buffer Overflow - Array Index Out of Bounds" for the following code :

typedef struct 
 char apn[100 + 1];
 char user[22 + 1];
 char pass[22 + 1];
 GprsParam_t;
typedef struct IfConfig_s 
 Eth_t eth;
 Gprs_t gprs;
 Wifi_t wifi;
 IfConfig_t;
typedef struct 
 char apn[64];
 char user[32];
 char pass[16];
 Gprs_t;
gprsParam_t accessPoint;
memset(accessPoint, 0x00, sizeof(accessPoint);
memcpy(accessPoint.apn, gprs.accessPoint.apn, sizeof(accessPoint.apn));

I'm trying to copy the value of apn in Gprs_t struct to apn in gprsParam_t
when the sizeof accessPoint.apn is 100 while the sizeof gprs.accessPoint.apn is 64. but it's causing klockwork issue :
Array 'apn' of size 64 may use index value(s) 64..100

I need help understanding this issue.

c buffer-overflow klocwork

share|improve this question

edited Mar 22 at 8:48

kessi

asked Mar 22 at 8:39

kessikessi

14212

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  What is accessPoint.apn? What is gprs.accessPoint.apn? Please create a Minimal, Complete, and Verifiable example that replicates your problem to show us. Also please take some time to refresh how to ask good questions, as well as this question checklist.
  
  – Some programmer dude
  Mar 22 at 8:40
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  We need to see a Minimal, Complete, and Verifiable example for this problem.
  
  – Sourav Ghosh
  Mar 22 at 8:40
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Your compiler is informing you that you are copying bytes beyond the limits of gprs.accessPoint.apn into accessPoint.apn. Try memcpy(accessPoint.apn, gprs.accessPoint.apn, sizeof(accessPoint.apn)<sizeof(gprs.accessPoint.apn)?sizeof(accessPoint.apn):sizeof(gprs.accessPoint.apn));
  
  – Gunther Schulz
  Mar 22 at 8:44
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  it's not a compilation error it's risen from klocwork static
  
  – kessi
  Mar 22 at 8:55
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The message is rather straight forward. You access the smaller array with the length of the larger array. You need to use the minimum of both sizes and handle the extra elements in the destination separately.
  
  – Gerhardh
  Mar 22 at 11:31
  

  
  
  
  

add a comment | 

I'm getting "Buffer Overflow - Array Index Out of Bounds" for the following code :

typedef struct 
 char apn[100 + 1];
 char user[22 + 1];
 char pass[22 + 1];
 GprsParam_t;
typedef struct IfConfig_s 
 Eth_t eth;
 Gprs_t gprs;
 Wifi_t wifi;
 IfConfig_t;
typedef struct 
 char apn[64];
 char user[32];
 char pass[16];
 Gprs_t;
gprsParam_t accessPoint;
memset(accessPoint, 0x00, sizeof(accessPoint);
memcpy(accessPoint.apn, gprs.accessPoint.apn, sizeof(accessPoint.apn));

I'm trying to copy the value of apn in Gprs_t struct to apn in gprsParam_t
when the sizeof accessPoint.apn is 100 while the sizeof gprs.accessPoint.apn is 64. but it's causing klockwork issue :
Array 'apn' of size 64 may use index value(s) 64..100

I need help understanding this issue.

c buffer-overflow klocwork

share|improve this question

edited Mar 22 at 8:48

kessi

asked Mar 22 at 8:39

kessikessi

14212

typedef struct 
 char apn[100 + 1];
 char user[22 + 1];
 char pass[22 + 1];
 GprsParam_t;
typedef struct IfConfig_s 
 Eth_t eth;
 Gprs_t gprs;
 Wifi_t wifi;
 IfConfig_t;
typedef struct 
 char apn[64];
 char user[32];
 char pass[16];
 Gprs_t;
gprsParam_t accessPoint;
memset(accessPoint, 0x00, sizeof(accessPoint);
memcpy(accessPoint.apn, gprs.accessPoint.apn, sizeof(accessPoint.apn));

share|improve this question

edited Mar 22 at 8:48

kessi

asked Mar 22 at 8:39

kessikessi

14212

share|improve this question

edited Mar 22 at 8:48

kessi

asked Mar 22 at 8:39

kessikessi

14212

asked Mar 22 at 8:39

kessikessi

14212

asked Mar 22 at 8:39

kessikessi

14212