[PATCH] fs: cifs: cifsencrypt.c: Cleaning up missing null-terminate in conjunction with strncpy

[Rickard Strandqvist]

2014-08-02 19:33 GMT+02:00 Joe Perches <joe at perches.com>:
> On Sat, 2014-08-02 at 11:55 -0500, Shirish Pargaonkar wrote:
>> Acked-by: Shirish Pargaonkar <spargaonkar at suse.com>
> []
>> > diff --git a/fs/cifs/cifsencrypt.c b/fs/cifs/cifsencrypt.c
> []
>> > @@ -307,7 +307,7 @@ int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
>> >
>> >         memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
>> >         if (password)
>> > -               strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE);
>> > +               strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE - 1);
>
>
> Is this always correct?


Hi

Because password_with_pad gets set to all zeros above, the character,
I do not guarantee a copy terminating null.
Unless it is so that you do not want any terminating null.


Kind regards
Rickard Strandqvist