From 1d6119baf0610f813eb9d9580eb4fd16de5b4ceb Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Mon, 2 Nov 2015 09:03:11 -0800 Subject: net: fix percpu memory leaks This patch fixes following problems : 1) percpu_counter_init() can return an error, therefore init_frag_mem_limit() must propagate this error so that inet_frags_init_net() can do the same up to its callers. 2) If ip[46]_frags_ns_ctl_register() fail, we must unwind properly and free the percpu_counter. Without this fix, we leave freed object in percpu_counters global list (if CONFIG_HOTPLUG_CPU) leading to crashes. This bug was detected by KASAN and syzkaller tool (http://github.com/google/syzkaller) Fixes: 6d7b857d541e ("net: use lib/percpu_counter API for fragmentation mem accounting") Signed-off-by: Eric Dumazet Reported-by: Dmitry Vyukov Cc: Hannes Frederic Sowa Cc: Jesper Dangaard Brouer Acked-by: Hannes Frederic Sowa Signed-off-by: David S. Miller --- net/ieee802154/6lowpan/reassembly.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) (limited to 'net/ieee802154') diff --git a/net/ieee802154/6lowpan/reassembly.c b/net/ieee802154/6lowpan/reassembly.c index 12e8cf4bda9f..6b437e8760d3 100644 --- a/net/ieee802154/6lowpan/reassembly.c +++ b/net/ieee802154/6lowpan/reassembly.c @@ -580,14 +580,19 @@ static int __net_init lowpan_frags_init_net(struct net *net) { struct netns_ieee802154_lowpan *ieee802154_lowpan = net_ieee802154_lowpan(net); + int res; ieee802154_lowpan->frags.high_thresh = IPV6_FRAG_HIGH_THRESH; ieee802154_lowpan->frags.low_thresh = IPV6_FRAG_LOW_THRESH; ieee802154_lowpan->frags.timeout = IPV6_FRAG_TIMEOUT; - inet_frags_init_net(&ieee802154_lowpan->frags); - - return lowpan_frags_ns_sysctl_register(net); + res = inet_frags_init_net(&ieee802154_lowpan->frags); + if (res) + return res; + res = lowpan_frags_ns_sysctl_register(net); + if (res) + inet_frags_uninit_net(&ieee802154_lowpan->frags); + return res; } static void __net_exit lowpan_frags_exit_net(struct net *net) -- cgit v1.2.3-58-ga151