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igmp: fix incorrect unsolicit report count when join group 

commit 4fb7253e4f9a8f06a986a3b317e2f79d9b43d552 upstream.

We should not start timer if im->unsolicit_count equal to 0 after decrease.
Or we will send one more unsolicit report message. i.e. 3 instead of 2 by
default.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
This commit is contained in:
Hangbin Liu 2018-08-29 18:06:08 +08:00 committed by syphyr
parent 39a1d7828f
commit 76f77a4dcf
1 changed files with 2 additions and 3 deletions
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5
net/ipv4/igmp.c
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@ -779,10 +779,9 @@ static void igmp_timer_expire(unsigned long data)
spin_lock(&im->lock);
im->tm_running = 0;
if (im->unsolicit_count) {
im->unsolicit_count--;
if (im->unsolicit_count && --im->unsolicit_count)
igmp_start_timer(im, unsolicited_report_interval(in_dev));
}
im->reporter = 1;
spin_unlock(&im->lock);