Re: [PATCH] Fix NULL pointer deref. on no default_rng

[Pierre <pinaraf@pinaraf.info>]

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On Sunday, November 12, 2017 8:16:27 PM CET PrasannaKumar Muralidharan wrote:
> Hi Pierre,
> 
> On 12 November 2017 at 19:54, Pierre Ducroquet <pinaraf@pinaraf.info> wrote:
> > If crypto_get_default_rng returns an error, the
> > function ecc_gen_privkey should return an error.
> > Instead, it currently tries to use the default_rng
> > nevertheless, thus creating a kernel panic with a
> > NULL pointer dereference.
> > Returning the error directly, as was supposedly
> > intended when looking at the code, fixes this.
> > 
> > Signed-off-by: Pierre Ducroquet <pinaraf@pinaraf.info>
> > ---
> > 
> >  crypto/ecc.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/crypto/ecc.c b/crypto/ecc.c
> > index 633a9bcdc574..18f32f2a5e1c 100644
> > --- a/crypto/ecc.c
> > +++ b/crypto/ecc.c
> > @@ -964,7 +964,7 @@ int ecc_gen_privkey(unsigned int curve_id, unsigned
> > int ndigits, u64 *privkey)> 
> >          * DRBG with a security strength of 256.
> >          */
> >         
> >         if (crypto_get_default_rng())
> > 
> > -               err = -EFAULT;
> > +               return -EFAULT;
> > 
> >         err = crypto_rng_get_bytes(crypto_default_rng, (u8 *)priv,
> >         nbytes);
> >         crypto_put_default_rng();
> > 
> > --
> > 2.15.0
> 
> Looks good to me.
> 
> Reviewed-by: PrasannaKumar Muralidharan <prasannatsmkumar@gmail.com>
> 
> Regards,
> PrasannaKumar

Hi

Thanks for your review.
Is there anything I should do to have this merged ? It fixes a kernel panic at 
boot on my computer, so I suppose other people may have that too.

Regards
 Pierre


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