diff options
| author | YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> | 2007-04-10 13:31:20 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-04-13 13:47:04 -0700 |
| commit | cda778fcf66a3d1ea47fa86e979c12996bcfbc8f (patch) | |
| tree | 3966d9db0ee2d8bcaf6fab47dbf10acb0dd3f4f4 | |
| parent | 1e3769dc9ac7559010cfad5400896f24f1d33ad3 (diff) | |
Fix length validation in rawv6_sendmsg()
[IPv6]: Fix incorrect length check in rawv6_sendmsg()
In article <20070329.142644.70222545.davem@davemloft.net> (at Thu, 29 Mar 2007 14:26:44 -0700 (PDT)), David Miller <davem@davemloft.net> says:
> From: Sridhar Samudrala <sri@us.ibm.com>
> Date: Thu, 29 Mar 2007 14:17:28 -0700
>
> > The check for length in rawv6_sendmsg() is incorrect.
> > As len is an unsigned int, (len < 0) will never be TRUE.
> > I think checking for IPV6_MAXPLEN(65535) is better.
> >
> > Is it possible to send ipv6 jumbo packets using raw
> > sockets? If so, we can remove this check.
>
> I don't see why such a limitation against jumbo would exist,
> does anyone else?
>
> Thanks for catching this Sridhar. A good compiler should simply
> fail to compile "if (x < 0)" when 'x' is an unsigned type, don't
> you think :-)
Dave, we use "int" for returning value,
so we should fix this anyway, IMHO;
we should not allow len > INT_MAX.
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Acked-by: Sridhar Samudrala <sri@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | net/ipv6/raw.c | 4 | ||||
| -rw-r--r-- | net/ipv6/udp.c | 2 |
2 files changed, 3 insertions, 3 deletions
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c index 4ae1b19ada5..9479fbd223c 100644 --- a/net/ipv6/raw.c +++ b/net/ipv6/raw.c @@ -688,9 +688,9 @@ static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk, int err; /* Rough check on arithmetic overflow, - better check is made in ip6_build_xmit + better check is made in ip6_append_data(). */ - if (len < 0) + if (len > INT_MAX) return -EMSGSIZE; /* Mirror BSD error message compatibility */ diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c index f52a5c3cc0a..b5dc5dbf186 100644 --- a/net/ipv6/udp.c +++ b/net/ipv6/udp.c @@ -616,7 +616,7 @@ do_udp_sendmsg: return udp_sendmsg(iocb, sk, msg, len); /* Rough check on arithmetic overflow, - better check is made in ip6_build_xmit + better check is made in ip6_append_data(). */ if (len > INT_MAX - sizeof(struct udphdr)) return -EMSGSIZE; |