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Re: [Wget-dev] wget2 | Fuzz test fails on 32bit build (with ASAN) (#477)


From: Tim Rühsen
Subject: Re: [Wget-dev] wget2 | Fuzz test fails on 32bit build (with ASAN) (#477)
Date: Mon, 30 Sep 2019 15:32:44 +0000



Tim Rühsen commented:


What I do see is (seemingly) a wrong pointer comparison:
```
#include <stdio.h>

void main(void) {
        char *a=0xf3e0080c;
        size_t n=235429897;

        printf("%p %p %d\n", a, a + n, a >= (char *)(a + n));

        char *b = a + n;
        printf("%p %p %d\n", a, b, a >= b);
}
```

Prints out
```
0xf3e0080c 0x1e86815 0
0xf3e0080c 0x1e86815 1
```

The second output is what I expected. Not sure if that is a C specialty. The 
`(char *)(a + n)` is a bit explicit - it originally was `a + n`. The check 
should find out about pointer overflow.

@darnir Any idea ?

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