Re: [PATCH ima-evm-utils] evmctl: fix memory leak in get_password

[Mimi Zohar <zohar@linux.ibm.com>]

On Wed, 2021-08-11 at 13:51 -0300, Bruno Meneguele wrote:
> On Wed, Aug 11, 2021 at 10:52:00AM -0400, Mimi Zohar wrote:
> 
> > > 
> > > -	return pwd;
> > > +	return password;
> > 
> > Wouldn't a simpler fix be to test "pwd" here?
> >         if (!pwd)
> >                 free(password);
> >         return pwd;
> > 
> 
> The problem is on success, when 'pwd' is actually not NULL.
> With that, I can't free(password). I would need to asprintf(pwd, ...) or
> strndup(password). Because of that, I thought it would be cleaner to
> remove 'password' completely.

I see.  So instead of "return pwd" as suggested above,

        if (!pwd) {
                free(password);
                password = NULL;  <== set or return NULL
        }

        return password;

thanks,

Mimi