linux-kernel - [PATCH 3.16 365/370] igmp, mld: Fix memory leak in igmpv3/mld_del

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Date:   Fri, 10 Mar 2017 11:46:23 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Daniel Borkmann" <daniel@...earbox.net>,
        "Hangbin Liu" <liuhangbin@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.16 365/370] igmp, mld: Fix memory leak in
 igmpv3/mld_del_delrec()

3.16.42-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Hangbin Liu <liuhangbin@...il.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@...earbox.net>
Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.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);
 }