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Message-Id: <1381488130-30235-64-git-send-email-luis.henriques@canonical.com> Date: Fri, 11 Oct 2013 11:41:33 +0100 From: Luis Henriques <luis.henriques@...onical.com> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org, kernel-team@...ts.ubuntu.com Cc: Salam Noureddine <noureddine@...stanetworks.com>, "David S. Miller" <davem@...emloft.net>, Luis Henriques <luis.henriques@...onical.com> Subject: [PATCH 063/100] ipv6 mcast: use in6_dev_put in timer handlers instead of __in6_dev_put 3.5.7.23 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Salam Noureddine <noureddine@...stanetworks.com> commit 9260d3e1013701aa814d10c8fc6a9f92bd17d643 upstream. It is possible for the timer handlers to run after the call to ipv6_mc_down so use in6_dev_put instead of __in6_dev_put in the handler function in order to do proper cleanup when the refcnt reaches 0. Otherwise, the refcnt can reach zero without the inet6_dev being destroyed and we end up leaking a reference to the net_device and see messages like the following, unregister_netdevice: waiting for eth0 to become free. Usage count = 1 Tested on linux-3.4.43. Signed-off-by: Salam Noureddine <noureddine@...stanetworks.com> Signed-off-by: David S. Miller <davem@...emloft.net> [ luis: backported to 3.5 (based on davem backport to 3.4): - dropped changes to mld_dad_timer_expire() ] Signed-off-by: Luis Henriques <luis.henriques@...onical.com> --- net/ipv6/mcast.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c index 2e97228..4441a0f 100644 --- a/net/ipv6/mcast.c +++ b/net/ipv6/mcast.c @@ -2149,7 +2149,7 @@ static void mld_gq_timer_expire(unsigned long data) idev->mc_gq_running = 0; mld_send_report(idev, NULL); - __in6_dev_put(idev); + in6_dev_put(idev); } static void mld_ifc_timer_expire(unsigned long data) @@ -2162,7 +2162,7 @@ static void mld_ifc_timer_expire(unsigned long data) if (idev->mc_ifc_count) mld_ifc_start_timer(idev, idev->mc_maxdelay); } - __in6_dev_put(idev); + in6_dev_put(idev); } static void mld_ifc_event(struct inet6_dev *idev) -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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