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  1. // buggy.c
  2. #include <stdio.h>
  3. #include <stdlib.h>
  4. #include <string.h>
  5.  
  6. void copy_input(const char *input) {
  7.     char *buffer = (char *)malloc(100);
  8.     strcpy(buffer, input);  // Possible overflow
  9.     printf("Copied: %s\n", buffer);
  10.     free(buffer);
  11. }
  12.  
  13. void call_uninit() {
  14.     char *p=malloc(100);
  15.     strcpy(p, "Danger!");  // Using uninitialized pointer
  16. }
  17.  
  18. int main() {
  19.     copy_input("This input is too long for the buffer!");
  20.     call_uninit();
  21.  
  22.     char *leak = malloc(100);
  23.     strcpy(leak, "Memory not freed");  // Leak here
  24.  
  25.     return 0;
  26. }
  27.  
Success #stdin #stdout 0s 5324KB
comments (?)
stdin
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1
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10
42
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stdout
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Copied: This input is too long for the buffer!
https://ideone.com/KuFyBB
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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