From: Greg Kroah-Hartman Date: Sat, 17 Oct 2020 11:03:30 +0000 (+0200) Subject: 4.14-stable patches X-Git-Tag: v4.4.241~64 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=c37680f9b2df2eac4016ee1f0cc42fe86c6bb8d1;p=thirdparty%2Fkernel%2Fstable-queue.git 4.14-stable patches added patches: ibmveth-identify-ingress-large-send-packets.patch ibmveth-switch-order-of-ibmveth_helper-calls.patch ipv4-restore-flowi4_oif-update-before-call-to-xfrm_lookup_route.patch mlx4-handle-non-napi-callers-to-napi_poll.patch net-ipv4-always-honour-route-mtu-during-forwarding.patch net-usb-qmi_wwan-add-cellient-mpl200-card.patch r8169-fix-data-corruption-issue-on-rtl8402.patch tipc-fix-the-skb_unshare-in-tipc_buf_append.patch --- diff --git a/queue-4.14/ibmveth-identify-ingress-large-send-packets.patch b/queue-4.14/ibmveth-identify-ingress-large-send-packets.patch new file mode 100644 index 00000000000..18b2f556313 --- /dev/null +++ b/queue-4.14/ibmveth-identify-ingress-large-send-packets.patch @@ -0,0 +1,57 @@ +From foo@baz Sat Oct 17 01:00:22 PM CEST 2020 +From: David Wilder +Date: Tue, 13 Oct 2020 16:20:14 -0700 +Subject: ibmveth: Identify ingress large send packets. + +From: David Wilder + +[ Upstream commit 413f142cc05cb03f2d1ea83388e40c1ddc0d74e9 ] + +Ingress large send packets are identified by either: +The IBMVETH_RXQ_LRG_PKT flag in the receive buffer +or with a -1 placed in the ip header checksum. +The method used depends on firmware version. Frame +geometry and sufficient header validation is performed by the +hypervisor eliminating the need for further header checks here. + +Fixes: 7b5967389f5a ("ibmveth: set correct gso_size and gso_type") +Signed-off-by: David Wilder +Reviewed-by: Thomas Falcon +Reviewed-by: Cristobal Forno +Reviewed-by: Pradeep Satyanarayana +Acked-by: Willem de Bruijn +Signed-off-by: Jakub Kicinski +Signed-off-by: Greg Kroah-Hartman +--- + drivers/net/ethernet/ibm/ibmveth.c | 13 ++++++++++++- + 1 file changed, 12 insertions(+), 1 deletion(-) + +--- a/drivers/net/ethernet/ibm/ibmveth.c ++++ b/drivers/net/ethernet/ibm/ibmveth.c +@@ -1330,6 +1330,7 @@ static int ibmveth_poll(struct napi_stru + int offset = ibmveth_rxq_frame_offset(adapter); + int csum_good = ibmveth_rxq_csum_good(adapter); + int lrg_pkt = ibmveth_rxq_large_packet(adapter); ++ __sum16 iph_check = 0; + + skb = ibmveth_rxq_get_buffer(adapter); + +@@ -1366,7 +1367,17 @@ static int ibmveth_poll(struct napi_stru + skb_put(skb, length); + skb->protocol = eth_type_trans(skb, netdev); + +- if (length > netdev->mtu + ETH_HLEN) { ++ /* PHYP without PLSO support places a -1 in the ip ++ * checksum for large send frames. ++ */ ++ if (skb->protocol == cpu_to_be16(ETH_P_IP)) { ++ struct iphdr *iph = (struct iphdr *)skb->data; ++ ++ iph_check = iph->check; ++ } ++ ++ if ((length > netdev->mtu + ETH_HLEN) || ++ lrg_pkt || iph_check == 0xffff) { + ibmveth_rx_mss_helper(skb, mss, lrg_pkt); + adapter->rx_large_packets++; + } diff --git a/queue-4.14/ibmveth-switch-order-of-ibmveth_helper-calls.patch b/queue-4.14/ibmveth-switch-order-of-ibmveth_helper-calls.patch new file mode 100644 index 00000000000..c95ec065b55 --- /dev/null +++ b/queue-4.14/ibmveth-switch-order-of-ibmveth_helper-calls.patch @@ -0,0 +1,48 @@ +From foo@baz Sat Oct 17 01:00:22 PM CEST 2020 +From: David Wilder +Date: Tue, 13 Oct 2020 16:20:13 -0700 +Subject: ibmveth: Switch order of ibmveth_helper calls. + +From: David Wilder + +[ Upstream commit 5ce9ad815a296374ca21f43f3b1ab5083d202ee1 ] + +ibmveth_rx_csum_helper() must be called after ibmveth_rx_mss_helper() +as ibmveth_rx_csum_helper() may alter ip and tcp checksum values. + +Fixes: 66aa0678efc2 ("ibmveth: Support to enable LSO/CSO for Trunk VEA.") +Signed-off-by: David Wilder +Reviewed-by: Thomas Falcon +Reviewed-by: Cristobal Forno +Reviewed-by: Pradeep Satyanarayana +Acked-by: Willem de Bruijn +Signed-off-by: Jakub Kicinski +Signed-off-by: Greg Kroah-Hartman +--- + drivers/net/ethernet/ibm/ibmveth.c | 10 +++++----- + 1 file changed, 5 insertions(+), 5 deletions(-) + +--- a/drivers/net/ethernet/ibm/ibmveth.c ++++ b/drivers/net/ethernet/ibm/ibmveth.c +@@ -1366,16 +1366,16 @@ static int ibmveth_poll(struct napi_stru + skb_put(skb, length); + skb->protocol = eth_type_trans(skb, netdev); + +- if (csum_good) { +- skb->ip_summed = CHECKSUM_UNNECESSARY; +- ibmveth_rx_csum_helper(skb, adapter); +- } +- + if (length > netdev->mtu + ETH_HLEN) { + ibmveth_rx_mss_helper(skb, mss, lrg_pkt); + adapter->rx_large_packets++; + } + ++ if (csum_good) { ++ skb->ip_summed = CHECKSUM_UNNECESSARY; ++ ibmveth_rx_csum_helper(skb, adapter); ++ } ++ + napi_gro_receive(napi, skb); /* send it up */ + + netdev->stats.rx_packets++; diff --git a/queue-4.14/ipv4-restore-flowi4_oif-update-before-call-to-xfrm_lookup_route.patch b/queue-4.14/ipv4-restore-flowi4_oif-update-before-call-to-xfrm_lookup_route.patch new file mode 100644 index 00000000000..4b3b55248a1 --- /dev/null +++ b/queue-4.14/ipv4-restore-flowi4_oif-update-before-call-to-xfrm_lookup_route.patch @@ -0,0 +1,40 @@ +From foo@baz Sat Oct 17 01:00:22 PM CEST 2020 +From: David Ahern +Date: Fri, 9 Oct 2020 11:01:01 -0700 +Subject: ipv4: Restore flowi4_oif update before call to xfrm_lookup_route + +From: David Ahern + +[ Upstream commit 874fb9e2ca949b443cc419a4f2227cafd4381d39 ] + +Tobias reported regressions in IPsec tests following the patch +referenced by the Fixes tag below. The root cause is dropping the +reset of the flowi4_oif after the fib_lookup. Apparently it is +needed for xfrm cases, so restore the oif update to ip_route_output_flow +right before the call to xfrm_lookup_route. + +Fixes: 2fbc6e89b2f1 ("ipv4: Update exception handling for multipath routes via same device") +Reported-by: Tobias Brunner +Signed-off-by: David Ahern +Signed-off-by: Jakub Kicinski +Signed-off-by: Greg Kroah-Hartman +--- + net/ipv4/route.c | 4 +++- + 1 file changed, 3 insertions(+), 1 deletion(-) + +--- a/net/ipv4/route.c ++++ b/net/ipv4/route.c +@@ -2603,10 +2603,12 @@ struct rtable *ip_route_output_flow(stru + if (IS_ERR(rt)) + return rt; + +- if (flp4->flowi4_proto) ++ if (flp4->flowi4_proto) { ++ flp4->flowi4_oif = rt->dst.dev->ifindex; + rt = (struct rtable *)xfrm_lookup_route(net, &rt->dst, + flowi4_to_flowi(flp4), + sk, 0); ++ } + + return rt; + } diff --git a/queue-4.14/mlx4-handle-non-napi-callers-to-napi_poll.patch b/queue-4.14/mlx4-handle-non-napi-callers-to-napi_poll.patch new file mode 100644 index 00000000000..005513fa9f3 --- /dev/null +++ b/queue-4.14/mlx4-handle-non-napi-callers-to-napi_poll.patch @@ -0,0 +1,46 @@ +From foo@baz Sat Oct 17 01:00:22 PM CEST 2020 +From: Jonathan Lemon +Date: Thu, 8 Oct 2020 11:45:26 -0700 +Subject: mlx4: handle non-napi callers to napi_poll + +From: Jonathan Lemon + +[ Upstream commit b2b8a92733b288128feb57ffa694758cf475106c ] + +netcons calls napi_poll with a budget of 0 to transmit packets. +Handle this by: + - skipping RX processing + - do not try to recycle TX packets to the RX cache + +Signed-off-by: Jonathan Lemon +Reviewed-by: Tariq Toukan +Signed-off-by: Jakub Kicinski +Signed-off-by: Greg Kroah-Hartman +--- + drivers/net/ethernet/mellanox/mlx4/en_rx.c | 3 +++ + drivers/net/ethernet/mellanox/mlx4/en_tx.c | 2 +- + 2 files changed, 4 insertions(+), 1 deletion(-) + +--- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c ++++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c +@@ -948,6 +948,9 @@ int mlx4_en_poll_rx_cq(struct napi_struc + bool clean_complete = true; + int done; + ++ if (!budget) ++ return 0; ++ + if (priv->tx_ring_num[TX_XDP]) { + xdp_tx_cq = priv->tx_cq[TX_XDP][cq->ring]; + if (xdp_tx_cq->xdp_busy) { +--- a/drivers/net/ethernet/mellanox/mlx4/en_tx.c ++++ b/drivers/net/ethernet/mellanox/mlx4/en_tx.c +@@ -343,7 +343,7 @@ u32 mlx4_en_recycle_tx_desc(struct mlx4_ + .dma = tx_info->map0_dma, + }; + +- if (!mlx4_en_rx_recycle(ring->recycle_ring, &frame)) { ++ if (!napi_mode || !mlx4_en_rx_recycle(ring->recycle_ring, &frame)) { + dma_unmap_page(priv->ddev, tx_info->map0_dma, + PAGE_SIZE, priv->dma_dir); + put_page(tx_info->page); diff --git a/queue-4.14/net-ipv4-always-honour-route-mtu-during-forwarding.patch b/queue-4.14/net-ipv4-always-honour-route-mtu-during-forwarding.patch new file mode 100644 index 00000000000..152d232d905 --- /dev/null +++ b/queue-4.14/net-ipv4-always-honour-route-mtu-during-forwarding.patch @@ -0,0 +1,80 @@ +From foo@baz Sat Oct 17 01:00:22 PM CEST 2020 +From: "Maciej Żenczykowski" +Date: Wed, 23 Sep 2020 13:18:15 -0700 +Subject: net/ipv4: always honour route mtu during forwarding + +From: "Maciej Żenczykowski" + +[ Upstream commit 02a1b175b0e92d9e0fa5df3957ade8d733ceb6a0 ] + +Documentation/networking/ip-sysctl.txt:46 says: + ip_forward_use_pmtu - BOOLEAN + By default we don't trust protocol path MTUs while forwarding + because they could be easily forged and can lead to unwanted + fragmentation by the router. + You only need to enable this if you have user-space software + which tries to discover path mtus by itself and depends on the + kernel honoring this information. This is normally not the case. + Default: 0 (disabled) + Possible values: + 0 - disabled + 1 - enabled + +Which makes it pretty clear that setting it to 1 is a potential +security/safety/DoS issue, and yet it is entirely reasonable to want +forwarded traffic to honour explicitly administrator configured +route mtus (instead of defaulting to device mtu). + +Indeed, I can't think of a single reason why you wouldn't want to. +Since you configured a route mtu you probably know better... + +It is pretty common to have a higher device mtu to allow receiving +large (jumbo) frames, while having some routes via that interface +(potentially including the default route to the internet) specify +a lower mtu. + +Note that ipv6 forwarding uses device mtu unless the route is locked +(in which case it will use the route mtu). + +This approach is not usable for IPv4 where an 'mtu lock' on a route +also has the side effect of disabling TCP path mtu discovery via +disabling the IPv4 DF (don't frag) bit on all outgoing frames. + +I'm not aware of a way to lock a route from an IPv6 RA, so that also +potentially seems wrong. + +Signed-off-by: Maciej Żenczykowski +Cc: Eric Dumazet +Cc: Willem de Bruijn +Cc: Lorenzo Colitti +Cc: Sunmeet Gill (Sunny) +Cc: Vinay Paradkar +Cc: Tyler Wear +Cc: David Ahern +Reviewed-by: Eric Dumazet +Signed-off-by: Greg Kroah-Hartman +--- + include/net/ip.h | 6 ++++++ + 1 file changed, 6 insertions(+) + +--- a/include/net/ip.h ++++ b/include/net/ip.h +@@ -364,12 +364,18 @@ static inline unsigned int ip_dst_mtu_ma + bool forwarding) + { + struct net *net = dev_net(dst->dev); ++ unsigned int mtu; + + if (net->ipv4.sysctl_ip_fwd_use_pmtu || + ip_mtu_locked(dst) || + !forwarding) + return dst_mtu(dst); + ++ /* 'forwarding = true' case should always honour route mtu */ ++ mtu = dst_metric_raw(dst, RTAX_MTU); ++ if (mtu) ++ return mtu; ++ + return min(READ_ONCE(dst->dev->mtu), IP_MAX_MTU); + } + diff --git a/queue-4.14/net-usb-qmi_wwan-add-cellient-mpl200-card.patch b/queue-4.14/net-usb-qmi_wwan-add-cellient-mpl200-card.patch new file mode 100644 index 00000000000..8fac4efe1c2 --- /dev/null +++ b/queue-4.14/net-usb-qmi_wwan-add-cellient-mpl200-card.patch @@ -0,0 +1,29 @@ +From foo@baz Sat Oct 17 01:00:22 PM CEST 2020 +From: Wilken Gottwalt +Date: Thu, 8 Oct 2020 09:21:38 +0200 +Subject: net: usb: qmi_wwan: add Cellient MPL200 card + +From: Wilken Gottwalt + +[ Upstream commit 28802e7c0c9954218d1830f7507edc9d49b03a00 ] + +Add usb ids of the Cellient MPL200 card. + +Signed-off-by: Wilken Gottwalt +Acked-by: Bjørn Mork +Signed-off-by: Jakub Kicinski +Signed-off-by: Greg Kroah-Hartman +--- + drivers/net/usb/qmi_wwan.c | 1 + + 1 file changed, 1 insertion(+) + +--- a/drivers/net/usb/qmi_wwan.c ++++ b/drivers/net/usb/qmi_wwan.c +@@ -1301,6 +1301,7 @@ static const struct usb_device_id produc + {QMI_QUIRK_SET_DTR(0x2cb7, 0x0104, 4)}, /* Fibocom NL678 series */ + {QMI_FIXED_INTF(0x0489, 0xe0b4, 0)}, /* Foxconn T77W968 LTE */ + {QMI_FIXED_INTF(0x0489, 0xe0b5, 0)}, /* Foxconn T77W968 LTE with eSIM support*/ ++ {QMI_FIXED_INTF(0x2692, 0x9025, 4)}, /* Cellient MPL200 (rebranded Qualcomm 05c6:9025) */ + + /* 4. Gobi 1000 devices */ + {QMI_GOBI1K_DEVICE(0x05c6, 0x9212)}, /* Acer Gobi Modem Device */ diff --git a/queue-4.14/r8169-fix-data-corruption-issue-on-rtl8402.patch b/queue-4.14/r8169-fix-data-corruption-issue-on-rtl8402.patch new file mode 100644 index 00000000000..8c24f4112ec --- /dev/null +++ b/queue-4.14/r8169-fix-data-corruption-issue-on-rtl8402.patch @@ -0,0 +1,154 @@ +From foo@baz Sat Oct 17 12:48:24 PM CEST 2020 +From: Heiner Kallweit +Date: Thu, 1 Oct 2020 09:23:02 +0200 +Subject: r8169: fix data corruption issue on RTL8402 + +From: Heiner Kallweit + +[ Upstream commit ef9da46ddef071e1bbb943afbbe9b38771855554 ] + +Petr reported that after resume from suspend RTL8402 partially +truncates incoming packets, and re-initializing register RxConfig +before the actual chip re-initialization sequence is needed to avoid +the issue. + +Reported-by: Petr Tesarik +Proposed-by: Petr Tesarik +Tested-by: Petr Tesarik +Signed-off-by: Heiner Kallweit +Signed-off-by: Greg Kroah-Hartman +--- + drivers/net/ethernet/realtek/r8169.c | 108 ++++++++++++++++++----------------- + 1 file changed, 56 insertions(+), 52 deletions(-) + +--- a/drivers/net/ethernet/realtek/r8169.c ++++ b/drivers/net/ethernet/realtek/r8169.c +@@ -4501,6 +4501,58 @@ static void rtl_rar_set(struct rtl8169_p + rtl_unlock_work(tp); + } + ++static void rtl_init_rxcfg(struct rtl8169_private *tp) ++{ ++ void __iomem *ioaddr = tp->mmio_addr; ++ ++ switch (tp->mac_version) { ++ case RTL_GIGA_MAC_VER_01: ++ case RTL_GIGA_MAC_VER_02: ++ case RTL_GIGA_MAC_VER_03: ++ case RTL_GIGA_MAC_VER_04: ++ case RTL_GIGA_MAC_VER_05: ++ case RTL_GIGA_MAC_VER_06: ++ case RTL_GIGA_MAC_VER_10: ++ case RTL_GIGA_MAC_VER_11: ++ case RTL_GIGA_MAC_VER_12: ++ case RTL_GIGA_MAC_VER_13: ++ case RTL_GIGA_MAC_VER_14: ++ case RTL_GIGA_MAC_VER_15: ++ case RTL_GIGA_MAC_VER_16: ++ case RTL_GIGA_MAC_VER_17: ++ RTL_W32(RxConfig, RX_FIFO_THRESH | RX_DMA_BURST); ++ break; ++ case RTL_GIGA_MAC_VER_18: ++ case RTL_GIGA_MAC_VER_19: ++ case RTL_GIGA_MAC_VER_20: ++ case RTL_GIGA_MAC_VER_21: ++ case RTL_GIGA_MAC_VER_22: ++ case RTL_GIGA_MAC_VER_23: ++ case RTL_GIGA_MAC_VER_24: ++ case RTL_GIGA_MAC_VER_34: ++ case RTL_GIGA_MAC_VER_35: ++ RTL_W32(RxConfig, RX128_INT_EN | RX_MULTI_EN | RX_DMA_BURST); ++ break; ++ case RTL_GIGA_MAC_VER_40: ++ case RTL_GIGA_MAC_VER_41: ++ case RTL_GIGA_MAC_VER_42: ++ case RTL_GIGA_MAC_VER_43: ++ case RTL_GIGA_MAC_VER_44: ++ case RTL_GIGA_MAC_VER_45: ++ case RTL_GIGA_MAC_VER_46: ++ case RTL_GIGA_MAC_VER_47: ++ case RTL_GIGA_MAC_VER_48: ++ case RTL_GIGA_MAC_VER_49: ++ case RTL_GIGA_MAC_VER_50: ++ case RTL_GIGA_MAC_VER_51: ++ RTL_W32(RxConfig, RX128_INT_EN | RX_MULTI_EN | RX_DMA_BURST | RX_EARLY_OFF); ++ break; ++ default: ++ RTL_W32(RxConfig, RX128_INT_EN | RX_DMA_BURST); ++ break; ++ } ++} ++ + static int rtl_set_mac_address(struct net_device *dev, void *p) + { + struct rtl8169_private *tp = netdev_priv(dev); +@@ -4519,6 +4571,10 @@ static int rtl_set_mac_address(struct ne + + pm_runtime_put_noidle(d); + ++ /* Reportedly at least Asus X453MA truncates packets otherwise */ ++ if (tp->mac_version == RTL_GIGA_MAC_VER_37) ++ rtl_init_rxcfg(tp); ++ + return 0; + } + +@@ -4955,58 +5011,6 @@ static void rtl_init_pll_power_ops(struc + break; + } + } +- +-static void rtl_init_rxcfg(struct rtl8169_private *tp) +-{ +- void __iomem *ioaddr = tp->mmio_addr; +- +- switch (tp->mac_version) { +- case RTL_GIGA_MAC_VER_01: +- case RTL_GIGA_MAC_VER_02: +- case RTL_GIGA_MAC_VER_03: +- case RTL_GIGA_MAC_VER_04: +- case RTL_GIGA_MAC_VER_05: +- case RTL_GIGA_MAC_VER_06: +- case RTL_GIGA_MAC_VER_10: +- case RTL_GIGA_MAC_VER_11: +- case RTL_GIGA_MAC_VER_12: +- case RTL_GIGA_MAC_VER_13: +- case RTL_GIGA_MAC_VER_14: +- case RTL_GIGA_MAC_VER_15: +- case RTL_GIGA_MAC_VER_16: +- case RTL_GIGA_MAC_VER_17: +- RTL_W32(RxConfig, RX_FIFO_THRESH | RX_DMA_BURST); +- break; +- case RTL_GIGA_MAC_VER_18: +- case RTL_GIGA_MAC_VER_19: +- case RTL_GIGA_MAC_VER_20: +- case RTL_GIGA_MAC_VER_21: +- case RTL_GIGA_MAC_VER_22: +- case RTL_GIGA_MAC_VER_23: +- case RTL_GIGA_MAC_VER_24: +- case RTL_GIGA_MAC_VER_34: +- case RTL_GIGA_MAC_VER_35: +- RTL_W32(RxConfig, RX128_INT_EN | RX_MULTI_EN | RX_DMA_BURST); +- break; +- case RTL_GIGA_MAC_VER_40: +- case RTL_GIGA_MAC_VER_41: +- case RTL_GIGA_MAC_VER_42: +- case RTL_GIGA_MAC_VER_43: +- case RTL_GIGA_MAC_VER_44: +- case RTL_GIGA_MAC_VER_45: +- case RTL_GIGA_MAC_VER_46: +- case RTL_GIGA_MAC_VER_47: +- case RTL_GIGA_MAC_VER_48: +- case RTL_GIGA_MAC_VER_49: +- case RTL_GIGA_MAC_VER_50: +- case RTL_GIGA_MAC_VER_51: +- RTL_W32(RxConfig, RX128_INT_EN | RX_MULTI_EN | RX_DMA_BURST | RX_EARLY_OFF); +- break; +- default: +- RTL_W32(RxConfig, RX128_INT_EN | RX_DMA_BURST); +- break; +- } +-} + + static void rtl8169_init_ring_indexes(struct rtl8169_private *tp) + { diff --git a/queue-4.14/series b/queue-4.14/series new file mode 100644 index 00000000000..6637c58307f --- /dev/null +++ b/queue-4.14/series @@ -0,0 +1,8 @@ +ibmveth-switch-order-of-ibmveth_helper-calls.patch +ibmveth-identify-ingress-large-send-packets.patch +ipv4-restore-flowi4_oif-update-before-call-to-xfrm_lookup_route.patch +mlx4-handle-non-napi-callers-to-napi_poll.patch +net-usb-qmi_wwan-add-cellient-mpl200-card.patch +tipc-fix-the-skb_unshare-in-tipc_buf_append.patch +net-ipv4-always-honour-route-mtu-during-forwarding.patch +r8169-fix-data-corruption-issue-on-rtl8402.patch diff --git a/queue-4.14/tipc-fix-the-skb_unshare-in-tipc_buf_append.patch b/queue-4.14/tipc-fix-the-skb_unshare-in-tipc_buf_append.patch new file mode 100644 index 00000000000..3dc3b3077c1 --- /dev/null +++ b/queue-4.14/tipc-fix-the-skb_unshare-in-tipc_buf_append.patch @@ -0,0 +1,41 @@ +From foo@baz Sat Oct 17 01:00:22 PM CEST 2020 +From: Cong Wang +Date: Wed, 7 Oct 2020 21:12:50 -0700 +Subject: tipc: fix the skb_unshare() in tipc_buf_append() + +From: Cong Wang + +[ Upstream commit ed42989eab57d619667d7e87dfbd8fe207db54fe ] + +skb_unshare() drops a reference count on the old skb unconditionally, +so in the failure case, we end up freeing the skb twice here. +And because the skb is allocated in fclone and cloned by caller +tipc_msg_reassemble(), the consequence is actually freeing the +original skb too, thus triggered the UAF by syzbot. + +Fix this by replacing this skb_unshare() with skb_cloned()+skb_copy(). + +Fixes: ff48b6222e65 ("tipc: use skb_unshare() instead in tipc_buf_append()") +Reported-and-tested-by: syzbot+e96a7ba46281824cc46a@syzkaller.appspotmail.com +Cc: Jon Maloy +Cc: Ying Xue +Signed-off-by: Cong Wang +Reviewed-by: Xin Long +Signed-off-by: Jakub Kicinski +Signed-off-by: Greg Kroah-Hartman +--- + net/tipc/msg.c | 3 ++- + 1 file changed, 2 insertions(+), 1 deletion(-) + +--- a/net/tipc/msg.c ++++ b/net/tipc/msg.c +@@ -140,7 +140,8 @@ int tipc_buf_append(struct sk_buff **hea + if (fragid == FIRST_FRAGMENT) { + if (unlikely(head)) + goto err; +- frag = skb_unshare(frag, GFP_ATOMIC); ++ if (skb_cloned(frag)) ++ frag = skb_copy(frag, GFP_ATOMIC); + if (unlikely(!frag)) + goto err; + head = *headbuf = frag;