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Segmentation Fault while copying unsigned int values in C


Segmentation Fault while copying unsigned int values in C

By : user2185263
Date : November 21 2020, 04:01 AM
Hope this helps In your code, pu8RetVal does not point to any valid memory. Being an automatic local scoped variable, the initial content of pu8RetVal is indeterminate - thus you are using the invalid memory which leads to undefined behaviour.
Before you can read to write to the address pointed by any pointer, you need to make sure that the pointer points to some valid memory.
code :
tSNMP_COUNTER64_TYPE pu8RetVal;


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Segmentation fault in 2D array unsigned char using calloc in C

Segmentation fault in 2D array unsigned char using calloc in C


By : user3743777
Date : March 29 2020, 07:55 AM
Hope that helps There is a typo in this statement. Instead of sizeof( unsigned char ) you have to use sizeof( unsigned char * )
code :
newmatriz = (unsigned char**) calloc(width, sizeof(unsigned char *));
                                                            ^^^^^^
if ( newmatriz[j] = calloc(witdh, sizeof(unsigned char) ) == NULL){
if ( ( newmatriz[j] = calloc(witdh, sizeof(unsigned char) ) ) == NULL){
for (i=0;i<width;i++)
{
    for(j=0;j<width;j++)
    {
        newmatriz[i][j] = 0;
    }
}
Getting segmentation fault after performing arithmetic on unsigned int

Getting segmentation fault after performing arithmetic on unsigned int


By : Sunny.hoe
Date : March 29 2020, 07:55 AM
This might help you The code is given below. I'm getting segmentation fault can't understand why. I think it's because of the arithmetic I'm doing on the variables t and k(both are unsigned int), can anyone explain why this segmentation fault is occurring. , I think that the problem is related to this if statement
code :
    if(t-k>0)
        printf("%u\n",a[t-k]);
    else
        printf("%u\n",a[t-k+n]);
printf("%u\n",a[t-k+n]);
if(t-k>0)
if ( t > k )
Segmentation fault when try to get data from point unsigned char

Segmentation fault when try to get data from point unsigned char


By : Calin Bunea
Date : March 29 2020, 07:55 AM
around this issue You push to the queue a pointer to a local object (created on the stack):
code :
for (U32 i = 0; i < k; ++i)
{
    //...
    CData data(buf, dataLen);     // CData object created on the stack
    res.push(&data);              // A pointer to this object is pushed to the queue
}                                 // CData object is destroyed, as we goes out of scope
memcpy unsigned int to unsigned char segmentation fault

memcpy unsigned int to unsigned char segmentation fault


By : Mike Higgins
Date : March 29 2020, 07:55 AM
wish of those help Assuming your call to test_result actually should be calling get_result, then you have two big problems.
The first and most serious is that you pass in uninitialized local variables as arguments to the function. Uninitialized local variables have indeterminate values. For a pointer, it means it can point just about anywhere, and trying to dereference it will lead to undefined behavior. You need to actually make these pointers point somewhere valid for it to work. This goes for both variables.
code :
unsigned char buf[256] = { 0 };  // Arbitrary size, all initialized to zero
unsigned short size = 0; // To make sure it's properly initialized

get_result(buf + 4, &size);  // Note use of & to pass a pointer to the variable size
Segmentation fault 11 on Mac, C++ unsigned int declaration

Segmentation fault 11 on Mac, C++ unsigned int declaration


By : Harvey
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , cipher and message seem to be arrays of characters. I guess that MAX_LEN is their size.
If so, you are going out of range in decrypt() : you address element i+3 of c and m, where i can be MAX_LEN-1. So you write 3 elements beyond the array's boundary. This is a buffer overflow and the most probable causes of your segfault.
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