[PATCH 3.16 365/370] igmp, mld: Fix memory leak in igmpv3/mld_del_delrec()

Ben Hutchings
2017-03-10T12:10:36Z

From: Hangbin Liu <liuhangbin@gmail.com>

commit 9c8bb163ae784be4f79ae504e78c862806087c54 upstream.

In function igmpv3/mld_add_delrec() we allocate pmc and put it in
idev->mc_tomb, so we should free it when we don't need it in del_delrec().
But I removed kfree(pmc) incorrectly in latest two patches. Now fix it.

Fixes: 24803f38a5c0 ("igmp: do not remove igmp souce list info when ...")
Fixes: 1666d49e1d41 ("mld: do not remove mld souce list info when ...")
Reported-by: Daniel Borkmann <daniel@iogearbox.net>
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>
---
net/ipv4/igmp.c | 1 +
net/ipv6/mcast.c | 1 +
2 files changed, 2 insertions(+)

--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -1145,6 +1145,7 @@ static void igmpv3_del_delrec(struct in_
psf->sf_crcount = im->crcount;
}
in_dev_put(pmc->interface);
+ kfree(pmc);
}
spin_unlock_bh(&im->lock);
}
--- a/net/ipv6/mcast.c
+++ b/net/ipv6/mcast.c
@@ -814,6 +814,7 @@ static void mld_del_delrec(struct inet6_
psf->sf_crcount = im->mca_crcount;
}
in6_dev_put(pmc->idev);
+ kfree(pmc);
}
spin_unlock_bh(&im->mca_lock);
}