linux-kernel - Re: [PATCH 1/5] staging/lustre/lnet: fix potential null pointer dereference

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Date:	Sun, 27 Apr 2014 15:38:47 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Oleg Drokin <green@...uxhacker.ru>
Cc:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
	Dmitry Eremin <dmitry.eremin@...el.com>
Subject: Re: [PATCH 1/5] staging/lustre/lnet: fix potential null pointer
 dereference

On Sun, Apr 27, 2014 at 06:19:59PM -0400, Oleg Drokin wrote:
> On Apr 27, 2014, at 6:05 PM, One Thousand Gnomes wrote:
> 
> >> Reviewed-by: John L. Hammond <john.hammond@...el.com>
> >> Reviewed-by: Isaac Huang <he.huang@...el.com>
> >> Signed-off-by: Oleg Drokin <oleg.drokin@...el.com>
> >> ---
> >> drivers/staging/lustre/lnet/klnds/socklnd/socklnd.c | 4 ++--
> >> 1 file changed, 2 insertions(+), 2 deletions(-)
> >> 
> >> diff --git a/drivers/staging/lustre/lnet/klnds/socklnd/socklnd.c b/drivers/staging/lustre/lnet/klnds/socklnd/socklnd.c
> >> index 21d36ee..516f623 100644
> >> --- a/drivers/staging/lustre/lnet/klnds/socklnd/socklnd.c
> >> +++ b/drivers/staging/lustre/lnet/klnds/socklnd/socklnd.c
> >> @@ -829,14 +829,14 @@ ksocknal_select_ips(ksock_peer_t *peer, __u32 *peerips, int n_peerips)
> >> 				best_npeers = iface->ksni_npeers;
> >> 			}
> >> 
> >> +			LASSERT(best_iface != NULL);
> >> +
> > 
> > And this solves the problem how ???
> 
> This does not really solve anything.
> Just moves the check to where it's actually going to do anything instead of the check being guarded by the NULL pointer access earlier on.
> Could have been removed instead of course to just get an oops at all times.

Then please just remove it, or, even better yet, fix it properly if
there is a way that this pointer can be NULL.

greg k-h
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