[LTP] [PATCH v3] mmap01: fix check_file() test for file corruption

[Cyril Hrubis]

Hi!
> diff --git a/testcases/kernel/syscalls/mmap/mmap01.c b/testcases/kernel/syscalls/mmap/mmap01.c
> index c93c37ceda52..ffbe6485a09c 100644
> --- a/testcases/kernel/syscalls/mmap/mmap01.c
> +++ b/testcases/kernel/syscalls/mmap/mmap01.c
> @@ -35,19 +35,23 @@ static void check_file(void)
>  {
>  	int i, fildes, buf_len = sizeof(STRING) + 3;
>  	char buf[buf_len];
> +	ssize_t len;
>  
>  	fildes = SAFE_OPEN(TEMPFILE, O_RDONLY);
> -	SAFE_READ(0, fildes, buf, sizeof(buf));
> -
> -	for (i = 0; i < buf_len; i++)
> +	len = SAFE_READ(0, fildes, buf, sizeof(buf));
> +	if (len != strlen(STRING)) {
> +		tst_res(TFAIL, "Read %zi expected %zu", len, strlen(STRING));
> +		goto out;
> +	}
> +	for (i = 0; i < len; i++)
>  		if (buf[i] == 'X' || buf[i] == 'Y' || buf[i] == 'Z')
>  			break;
>  
> -	if (i == buf_len)
> +	if (i == len)
>  		tst_res(TPASS, "Specified pattern not found in file");
>  	else
>  		tst_res(TFAIL, "Specified pattern found in file");
> -
> +out:
>  	SAFE_CLOSE(fildes);

We could close the file right after the read, that would have avoided
the goto, but I guess that the patch is good enough now.

Reviewed-by: Cyril Hrubis <chrubis@suse.cz>

-- 
Cyril Hrubis
chrubis@suse.cz