http://llvm.org/bugs/show_bug.cgi?id=21596
Bug ID: 21596
Summary: Pointer to an address returned from function does not
correlate to pointer to address in function. This
causes access to different place in memory, than was
expected.
Product: clang
Version: 3.5
Hardware: Macintosh
OS: MacOS X
Status: NEW
Severity: release blocker
Priority: P
Component: -New Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Version of llvm:
Apple LLVM version 6.0 (clang-600.0.54) (based on LLVM 3.5svn)
Code that shows the error:
#include <stdio.h>
#include <stdlib.h>
int ** create_2d_array (int size) {
int ** array = (int **)malloc(sizeof(int)*size);
printf("Address: 0x%llx\n", (long long) &array);
for (int i = 0; i < size; i++) {
array[i] = (int *)malloc(sizeof(int)*size);
for (int j = 0; j < size; j++) {
array[i][j] = 100;
printf("%5d ", array[i][j]);
}
printf("\n");
}
return array;
}
void print_2d_array(int ** array, int size) {
for (int i = 0; i < size; i++) {
for (int j = 0; j < size; j++) {
printf("%5d ", array[i][j]);
}
printf("\n");
}
}
int main(int argc, const char * argv[]) {
int ** array = create_2d_array(3);
printf("Address: 0x%llx\n", (long long) &array);
print_2d_array(array, 3);
return 0;
}
Expected output is:
Address: something
100 100 100
100 100 100
100 100 100
Address: something
100 100 100
100 100 100
100 100 100
I've got:
Address: 0x7fff5fbff760
100 100 100
100 100 100
100 100 100
Address: 0x7fff5fbff788
1070432 1 100
100 100 100
100 100 100
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