From 1562f147ac2b30c85ce09a86f7c480c740e6b37a Mon Sep 17 00:00:00 2001 From: Kirill Tkhai Date: Tue, 6 Mar 2018 18:46:39 +0300 Subject: [PATCH] net: Fix hlist corruptions in inet_evict_bucket() [ Upstream commit a560002437d3646dafccecb1bf32d1685112ddda ] inet_evict_bucket() iterates global list, and several tasks may call it in parallel. All of them hash the same fq->list_evictor to different lists, which leads to list corruption. This patch makes fq be hashed to expired list only if this has not been made yet by another task. Since inet_frag_alloc() allocates fq using kmem_cache_zalloc(), we may rely on list_evictor is initially unhashed. The problem seems to exist before async pernet_operations, as there was possible to have exit method to be executed in parallel with inet_frags::frags_work, so I add two Fixes tags. This also may go to stable. Fixes: d1fe19444d82 "inet: frag: don't re-use chainlist for evictor" Fixes: f84c6821aa54 "net: Convert pernet_subsys, registered from inet_init()" Signed-off-by: Kirill Tkhai Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/ipv4/inet_fragment.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/ipv4/inet_fragment.c b/net/ipv4/inet_fragment.c index 631c0d0..8effac0 100644 --- a/net/ipv4/inet_fragment.c +++ b/net/ipv4/inet_fragment.c @@ -119,6 +119,9 @@ out: static bool inet_fragq_should_evict(const struct inet_frag_queue *q) { + if (!hlist_unhashed(&q->list_evictor)) + return false; + return q->net->low_thresh == 0 || frag_mem_limit(q->net) >= q->net->low_thresh; } -- 2.7.4