On Mon, 2012-01-09 at 22:04 +0000, Ben Hutchings wrote:
> Commit 5b7c84066733c5dfb0e4016d939757b38de189e4 ('ipv4: correct IGMP
> behavior on v3 query during v2-compatibility mode') added yet another
> case for query parsing, which can result in max_delay = 0. Substitute
> a value of 1, as in the usual v3 case.
This has been assigned CVE-2012-0207.
Ben.
> Reported-by: Simon McVittie <smcv@debian.org>
> References: http://bugs.debian.org/654876
> Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
> ---
> net/ipv4/igmp.c | 2 ++
> 1 files changed, 2 insertions(+), 0 deletions(-)
>
> diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
> index d577199..e0d42db 100644
> --- a/net/ipv4/igmp.c
> +++ b/net/ipv4/igmp.c
> @@ -875,6 +875,8 @@ static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
> * to be intended in a v3 query.
> */
> max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
> + if (!max_delay)
> + max_delay = 1; /* can't mod w/ 0 */
> } else { /* v3 */
> if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
> return;
--
Ben Hutchings
Life is what happens to you while you're busy making other plans.
- John Lennon
Attachment:
signature.asc
Description: This is a digitally signed message part