Re: [PATCH] kernel: auditfilter: looping issue, memory leak if has 2 or more AUDIT_FILTERKEYs

[Eric Paris <eparis@redhat.com>]

----- Original Message -----
> 
>   also for function audit_list_rules:
>     when call audit_make_reply fails (will return NULL).
>     we also need process data->buf, not only data itself.
> 
>   please help check, thanks.

struct audit_rule_data {
[...]
        char            buf[0]; /* string fields buffer */
};

The last element in the struct is 0 length.  But the allocation in audit_krule_to_data() looks like:

data = kmalloc(sizeof(*data) + krule->buflen, GFP_KERNEL);

So now data->buf appears as an allocation of size krule->buflen.

We do not need to free it separately.  This is a pretty common C trick.

-Eric