igmp: Avoid zero delay when receiving odd mixture of IGMP queries
Commit 5b7c840667
('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>
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1 changed files with 2 additions and 0 deletions
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@ -880,6 +880,8 @@ static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
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* to be intended in a v3 query.
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*/
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max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
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if (!max_delay)
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max_delay = 1; /* can't mod w/ 0 */
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} else { /* v3 */
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if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
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return;
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