-stable review patch. If anyone has any objections, please let us know.
------------------
From: YOSHIFUJI Hideaki <[EMAIL PROTECTED]>
[IPv6]: Fix incorrect length check in rawv6_sendmsg()
In article <[EMAIL PROTECTED]> (at Thu, 29 Mar 2007 14:26:44 -0700 (PDT)),
David Miller <[EMAIL PROTECTED]> says:
> From: Sridhar Samudrala <[EMAIL PROTECTED]>
> 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 <[EMAIL PROTECTED]>
Acked-by: Sridhar Samudrala <[EMAIL PROTECTED]>
Signed-off-by: David S. Miller <[EMAIL PROTECTED]>
Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]>
---
net/ipv6/raw.c | 4 ++--
net/ipv6/udp.c | 2 +-
2 files changed, 3 insertions(+), 3 deletions(-)
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -688,9 +688,9 @@ static int rawv6_sendmsg(struct kiocb *i
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 */
--- 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;
--
-
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