From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Guillaume Nault <gnault@redhat.com>,
Pablo Neira Ayuso <pablo@netfilter.org>,
Sasha Levin <sashal@kernel.org>,
netfilter-devel@vger.kernel.org, coreteam@netfilter.org,
netdev@vger.kernel.org
Subject: [PATCH AUTOSEL 5.1 36/95] netfilter: ipv6: nf_defrag: accept duplicate fragments again
Date: Wed, 26 Jun 2019 20:29:21 -0400 [thread overview]
Message-ID: <20190627003021.19867-36-sashal@kernel.org> (raw)
In-Reply-To: <20190627003021.19867-1-sashal@kernel.org>
From: Guillaume Nault <gnault@redhat.com>
[ Upstream commit 8a3dca632538c550930ce8bafa8c906b130d35cf ]
When fixing the skb leak introduced by the conversion to rbtree, I
forgot about the special case of duplicate fragments. The condition
under the 'insert_error' label isn't effective anymore as
nf_ct_frg6_gather() doesn't override the returned value anymore. So
duplicate fragments now get NF_DROP verdict.
To accept duplicate fragments again, handle them specially as soon as
inet_frag_queue_insert() reports them. Return -EINPROGRESS which will
translate to NF_STOLEN verdict, like any accepted fragment. However,
such packets don't carry any new information and aren't queued, so we
just drop them immediately.
Fixes: a0d56cb911ca ("netfilter: ipv6: nf_defrag: fix leakage of unqueued fragments")
Signed-off-by: Guillaume Nault <gnault@redhat.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/ipv6/netfilter/nf_conntrack_reasm.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c
index 5b3f65e29b6f..8951de8b568f 100644
--- a/net/ipv6/netfilter/nf_conntrack_reasm.c
+++ b/net/ipv6/netfilter/nf_conntrack_reasm.c
@@ -265,8 +265,14 @@ static int nf_ct_frag6_queue(struct frag_queue *fq, struct sk_buff *skb,
prev = fq->q.fragments_tail;
err = inet_frag_queue_insert(&fq->q, skb, offset, end);
- if (err)
+ if (err) {
+ if (err == IPFRAG_DUP) {
+ /* No error for duplicates, pretend they got queued. */
+ kfree_skb(skb);
+ return -EINPROGRESS;
+ }
goto insert_error;
+ }
if (dev)
fq->iif = dev->ifindex;
@@ -304,8 +310,6 @@ static int nf_ct_frag6_queue(struct frag_queue *fq, struct sk_buff *skb,
return -EINPROGRESS;
insert_error:
- if (err == IPFRAG_DUP)
- goto err;
inet_frag_kill(&fq->q);
err:
skb_dst_drop(skb);
--
2.20.1
next prev parent reply other threads:[~2019-06-27 0:53 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20190627003021.19867-1-sashal@kernel.org>
2019-06-27 0:28 ` [PATCH AUTOSEL 5.1 08/95] bpf: fix out-of-bounds read in __bpf_skc_lookup Sasha Levin
2019-06-27 0:28 ` [PATCH AUTOSEL 5.1 09/95] samples, bpf: fix to change the buffer size for read() Sasha Levin
2019-06-27 0:28 ` [PATCH AUTOSEL 5.1 10/95] samples, bpf: suppress compiler warning Sasha Levin
2019-06-27 0:28 ` [PATCH AUTOSEL 5.1 11/95] bpf, riscv: clear target register high 32-bits for and/or/xor on ALU32 Sasha Levin
2019-06-27 0:28 ` [PATCH AUTOSEL 5.1 12/95] bpf: sockmap, restore sk_write_space when psock gets dropped Sasha Levin
2019-06-27 0:28 ` [PATCH AUTOSEL 5.1 13/95] mac80211: fix rate reporting inside cfg80211_calculate_bitrate_he() Sasha Levin
2019-06-27 0:28 ` [PATCH AUTOSEL 5.1 14/95] bpf: sockmap, fix use after free from sleep in psock backlog workqueue Sasha Levin
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 19/95] mac80211: mesh: fix RCU warning Sasha Levin
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 20/95] mac80211: free peer keys before vif down in mesh Sasha Levin
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 22/95] mwifiex: Fix possible buffer overflows at parsing bss descriptor Sasha Levin
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 23/95] mwifiex: Abort at too short BSS descriptor element Sasha Levin
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 24/95] bpf, riscv: clear high 32 bits for ALU32 add/sub/neg/lsh/rsh/arsh Sasha Levin
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 25/95] iwlwifi: fix load in rfkill flow for unified firmware Sasha Levin
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 26/95] iwlwifi: clear persistence bit according to device family Sasha Levin
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 27/95] iwlwifi: fix AX201 killer sku loading firmware issue Sasha Levin
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 28/95] iwlwifi: Fix double-free problems in iwl_req_fw_callback() Sasha Levin
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 29/95] mwifiex: Fix heap overflow in mwifiex_uap_parse_tail_ies() Sasha Levin
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 30/95] bpf: udp: ipv6: Avoid running reuseport's bpf_prog from __udp6_lib_err Sasha Levin
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 31/95] bpf: udp: Avoid calling reuseport's bpf_prog from udp_gro Sasha Levin
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 32/95] netfilter: ipv6: nf_defrag: fix leakage of unqueued fragments Sasha Levin
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 33/95] tools: bpftool: Fix JSON output when lookup fails Sasha Levin
2019-06-27 0:29 ` Sasha Levin [this message]
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 37/95] dt-bindings: can: mcp251x: add mcp25625 support Sasha Levin
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 38/95] can: mcp251x: add support for mcp25625 Sasha Levin
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 39/95] can: m_can: implement errata "Needless activation of MRAF irq" Sasha Levin
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 40/95] can: af_can: Fix error path of can_init() Sasha Levin
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 41/95] can: flexcan: Remove unneeded registration message Sasha Levin
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 42/95] net: phy: rename Asix Electronics PHY driver Sasha Levin
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 43/95] ibmvnic: Do not close unopened driver during reset Sasha Levin
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 44/95] ibmvnic: Refresh device multicast list after reset Sasha Levin
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 45/95] ibmvnic: Fix unchecked return codes of memory allocations Sasha Levin
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 48/95] bpf: lpm_trie: check left child of last leftmost node for NULL Sasha Levin
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 54/95] xdp: check device pointer before clearing Sasha Levin
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 56/95] mlxsw: spectrum: Disallow prio-tagged packets when PVID is removed Sasha Levin
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 58/95] bpf: fix div64 overflow tests to properly detect errors Sasha Levin
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 64/95] mac80211: only warn once on chanctx_conf being NULL Sasha Levin
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 65/95] mac80211: do not start any work during reconfigure flow Sasha Levin
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 66/95] cfg80211: util: fix bit count off by one Sasha Levin
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 67/95] cfg80211: report measurement start TSF correctly Sasha Levin
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 68/95] bpf, devmap: Fix premature entry free on destroying map Sasha Levin
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 69/95] bpf, devmap: Add missing bulk queue free Sasha Levin
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 70/95] bpf, devmap: Add missing RCU read lock on flush Sasha Levin
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 71/95] bpf, x64: fix stack layout of JITed bpf code Sasha Levin
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 72/95] qmi_wwan: add support for QMAP padding in the RX path Sasha Levin
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 73/95] qmi_wwan: avoid RCU stalls on device disconnect when in QMAP mode Sasha Levin
2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 74/95] qmi_wwan: extend permitted QMAP mux_id value range Sasha Levin
2019-06-27 0:30 ` [PATCH AUTOSEL 5.1 75/95] bpf: fix nested bpf tracepoints with per-cpu data Sasha Levin
2019-06-27 0:30 ` [PATCH AUTOSEL 5.1 84/95] bnx2x: Check if transceiver implements DDM before access Sasha Levin
2019-06-27 0:30 ` [PATCH AUTOSEL 5.1 86/95] ip6_tunnel: allow not to count pkts on tstats by passing dev as NULL Sasha Levin
2019-06-27 0:30 ` [PATCH AUTOSEL 5.1 87/95] net: lio_core: fix potential sign-extension overflow on large shift Sasha Levin
2019-06-27 0:30 ` [PATCH AUTOSEL 5.1 92/95] net: dsa: mv88e6xxx: fix shift of FID bits in mv88e6185_g1_vtu_loadpurge() Sasha Levin
2019-06-27 0:30 ` [PATCH AUTOSEL 5.1 95/95] net :sunrpc :clnt :Fix xps refcount imbalance on the error path Sasha Levin
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