netdev - Re: [net-next:master 14/17] net/bridge/br_mdb.c:330 br_mdb_add_group() error: potential null dereference 'mp'. (br_multicast_new

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Date:	Thu, 13 Dec 2012 15:15:05 +0800
From:	Cong Wang <amwang@...hat.com>
To:	kbuild test robot <fengguang.wu@...el.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [net-next:master 14/17] net/bridge/br_mdb.c:330
 br_mdb_add_group() error: potential null dereference 'mp'.
 (br_multicast_new_group returns null)

On Thu, 2012-12-13 at 03:21 +0800, kbuild test robot wrote:
> tree:   git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git master
> head:   520dfe3a3645257bf83660f672c47f8558f3d4c4
> commit: cfd567543590f71ca0af397437e2554f9756d750 [14/17] bridge: add support of adding and deleting mdb entries
> 
> 
> smatch warnings:
> 
> + net/bridge/br_mdb.c:330 br_mdb_add_group() error: potential null dereference 'mp'.  (br_multicast_new_group returns null)

br_multicast_new_group() seems impossible to return NULL, it either
returns a valid pointer (non-NULL) or some errno pointer.

OTOH, br_multicast_add_group() doesn't check for NULL either.

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