On 01/23/2012 09:47 AM, Andy Whitcroft wrote:

From: Ben Hutchings<ben@decadent.org.uk>

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.

Reported-by: Simon McVittie<smcv@debian.org>
References: http://bugs.debian.org/654876
Signed-off-by: Ben Hutchings<ben@decadent.org.uk>
Signed-off-by: David S. Miller<davem@davemloft.net>

(cherry picked from commit a8c1f65c79cbbb2f7da782d4c9d15639a9b94b27)
CVE-2012-0207
BugLink: http://bugs.launchpad.net/bugs/917848
Signed-off-by: Andy Whitcroft<apw@canonical.com>
---
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 d9d5130..f574cf6 100644
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -892,6 +892,8 @@ 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;



--
Tim Gardner tim.gardner@canonical.com

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On 23.01.2012 17:47, Andy Whitcroft wrote:
> From: Ben Hutchings <ben@decadent.org.uk>
>
> 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.
>
> Reported-by: Simon McVittie <smcv@debian.org>
> References: http://bugs.debian.org/654876
> Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
> Signed-off-by: David S. Miller <davem@davemloft.net>
>
> (cherry picked from commit a8c1f65c79cbbb2f7da782d4c9d15639a9b94b27)
> CVE-2012-0207
> BugLink: http://bugs.launchpad.net/bugs/917848
> Signed-off-by: Andy Whitcroft <apw@canonical.com>
> ---
> 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 d9d5130..f574cf6 100644
> --- a/net/ipv4/igmp.c
> +++ b/net/ipv4/igmp.c
> @@ -892,6 +892,8 @@ 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;


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