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

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Date:	Mon, 14 May 2012 09:53:15 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	hans.schillstrom@...csson.com, dan.carpenter@...cle.com,
	pablo@...filter.org, kaber@...sh.net,
	netfilter-devel@...r.kernel.org, netfilter@...r.kernel.org,
	coreteam@...filter.org, netdev@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [patch] netfilter: potential NULL dereference in
 get_inner_hdr()

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




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