netdev - Re: [patch] netfilter: potential NULL dereference in get_inner

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Date:	Mon, 14 May 2012 10:00:00 +0200
From:	Hans Schillstrom <hans.schillstrom@...csson.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	David Miller <davem@...emloft.net>,
	"dan.carpenter@...cle.com" <dan.carpenter@...cle.com>,
	"pablo@...filter.org" <pablo@...filter.org>,
	"kaber@...sh.net" <kaber@...sh.net>,
	"netfilter-devel@...r.kernel.org" <netfilter-devel@...r.kernel.org>,
	"netfilter@...r.kernel.org" <netfilter@...r.kernel.org>,
	"coreteam@...filter.org" <coreteam@...filter.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>
Subject: Re: [patch] netfilter: potential NULL dereference in get_inner_hdr()

On Monday 14 May 2012 09:53:15 Eric Dumazet wrote:
> On Mon, 2012-05-14 at 03:38 -0400, David Miller wrote:
> 
> > He said what he's using, "sparse", the semantic parser, which
> > is largely arch agnostic.
> > 
> > I guarantee you will see the warnings if you run it on your
> > system on this code.
> 
> Some more info :
> 
> http://lwn.net/Articles/205624/
> 
> make C=2 CF=-D__CHECK_ENDIAN__ net/netfilter/xt_HMARK.o
>   CHECK   net/netfilter/xt_HMARK.c
> net/netfilter/xt_HMARK.c:87:21: warning: incorrect type in assignment (different base types)
> net/netfilter/xt_HMARK.c:87:21:    expected unsigned short [unsigned] [usertype] src
> net/netfilter/xt_HMARK.c:87:21:    got restricted __be16 [usertype] all
> net/netfilter/xt_HMARK.c:88:21: warning: incorrect type in assignment (different base types)
> net/netfilter/xt_HMARK.c:88:21:    expected unsigned short [unsigned] [usertype] dst
> net/netfilter/xt_HMARK.c:88:21:    got restricted __be16 [usertype] all
> net/netfilter/xt_HMARK.c:170:27: warning: incorrect type in argument 2 (different signedness)
> net/netfilter/xt_HMARK.c:170:27:    expected int *offset
> net/netfilter/xt_HMARK.c:170:27:    got unsigned int *<noident>
> net/netfilter/xt_HMARK.c:181:28: warning: incorrect type in argument 1 (different base types)
> net/netfilter/xt_HMARK.c:181:28:    expected unsigned int const [usertype] *addr32
> net/netfilter/xt_HMARK.c:181:28:    got restricted __be32 *<noident>
> net/netfilter/xt_HMARK.c:182:28: warning: incorrect type in argument 1 (different base types)
> net/netfilter/xt_HMARK.c:182:28:    expected unsigned int const [usertype] *addr32
> net/netfilter/xt_HMARK.c:182:28:    got restricted __be32 *<noident>
> net/netfilter/xt_HMARK.c:261:9: warning: invalid assignment: &=
> net/netfilter/xt_HMARK.c:261:9:    left side has type unsigned int
> net/netfilter/xt_HMARK.c:261:9:    right side has type restricted __be32
> net/netfilter/xt_HMARK.c:262:9: warning: invalid assignment: &=
> net/netfilter/xt_HMARK.c:262:9:    left side has type unsigned int
> net/netfilter/xt_HMARK.c:262:9:    right side has type restricted __be32
> 

Thanks 
I'll try to fix the warnings

-- 
Regards
Hans Schillstrom <hans.schillstrom@...csson.com>
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