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Davide Caratti f77bd544a6 net/sched: act_ct: fix wild memory access when clearing fragments 
while testing re-assembly/re-fragmentation using act_ct, it's possible to
observe a crash like the following one:

 KASAN: maybe wild-memory-access in range [0x0001000000000448-0x000100000000044f]
 CPU: 50 PID: 0 Comm: swapper/50 Tainted: G S                5.12.0-rc7+ #424
 Hardware name: Dell Inc. PowerEdge R730/072T6D, BIOS 2.4.3 01/17/2017
 RIP: 0010:inet_frag_rbtree_purge+0x50/0xc0
 Code: 00 fc ff df 48 89 c3 31 ed 48 89 df e8 a9 7a 38 ff 4c 89 fe 48 89 df 49 89 c6 e8 5b 3a 38 ff 48 8d 7b 40 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 75 59 48 8d bb d0 00 00 00 4c 8b 6b 40 48 89 f8 48
 RSP: 0018:ffff888c31449db8 EFLAGS: 00010203
 RAX: 0000200000000089 RBX: 000100000000040e RCX: ffffffff989eb960
 RDX: 0000000000000140 RSI: ffffffff97cfb977 RDI: 000100000000044e
 RBP: 0000000000000900 R08: 0000000000000000 R09: ffffed1186289350
 R10: 0000000000000003 R11: ffffed1186289350 R12: dffffc0000000000
 R13: 000100000000040e R14: 0000000000000000 R15: ffff888155e02160
 FS:  0000000000000000(0000) GS:ffff888c31440000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: 00005600cb70a5b8 CR3: 0000000a2c014005 CR4: 00000000003706e0
 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
 Call Trace:
  <IRQ>
  inet_frag_destroy+0xa9/0x150
  call_timer_fn+0x2d/0x180
  run_timer_softirq+0x4fe/0xe70
  __do_softirq+0x197/0x5a0
  irq_exit_rcu+0x1de/0x200
  sysvec_apic_timer_interrupt+0x6b/0x80
  </IRQ>

when act_ct temporarily stores an IP fragment, restoring the skb qdisc cb
results in putting random data in FRAG_CB(), and this causes those "wild"
memory accesses later, when the rbtree is purged. Never overwrite the skb
cb in case tcf_ct_handle_fragments() returns -EINPROGRESS.

Fixes: ae372cb175 ("net/sched: act_ct: fix restore the qdisc_skb_cb after defrag")
Fixes: 7baf2429a1 ("net/sched: cls_flower add CT_FLAGS_INVALID flag support")
Reported-by: Shuang Li <shuali@redhat.com>
Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2021-04-26 13:06:39 -07:00
..
6lowpan 6lowpan: Fix some typos in nhc_udp.c 2021-03-24 17:52:11 -07:00
9p net: 9p: Correct function names in the kerneldoc comments 2021-03-28 17:56:56 -07:00
802
8021q Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-04-26 12:00:00 -07:00
appletalk appletalk: Fix skb allocation size in loopback case 2021-02-12 16:40:28 -08:00
atm
ax25 net/ax25: Delete obsolete TODO file 2021-03-30 16:54:50 -07:00
batman-adv Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-04-09 20:48:35 -07:00
bluetooth Bluetooth: Allow Microsoft extension to indicate curve validation 2021-04-08 12:26:34 +02:00
bpf bpf: selftests: Add kfunc_call test 2021-03-26 20:41:52 -07:00
bpfilter
bridge netfilter: allow to turn off xtables compat layer 2021-04-26 18:16:56 +02:00
caif net: caif: Use netif_rx_any_context(). 2021-02-15 13:21:48 -08:00
can can: proc: fix rcvlist_* header alignment on 64-bit system 2021-04-25 19:43:00 +02:00
ceph net: ceph: Fix a typo in osdmap.c 2021-03-25 17:05:07 -07:00
core Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-04-26 12:00:00 -07:00
dcb
dccp net: dccp: use net_generic storage 2021-04-09 16:34:56 -07:00
decnet net/decnet: Delete obsolete TODO file 2021-03-30 16:54:50 -07:00
dns_resolver
dsa net: dsa: fix bridge support for drivers without port_bridge_flags callback 2021-04-21 10:47:27 -07:00
ethernet of: net: pass the dst buffer to of_get_mac_address() 2021-04-13 14:35:02 -07:00
ethtool ethtool: stats: clarify the initialization to ETHTOOL_STAT_NOT_SET 2021-04-19 16:23:32 -07:00
hsr Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-04-09 20:48:35 -07:00
ieee802154 net: remove the new_ifindex argument from dev_change_net_namespace 2021-04-07 14:43:28 -07:00
ife
ipv4 Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next 2021-04-26 12:31:42 -07:00
ipv6 netfilter: allow to turn off xtables compat layer 2021-04-26 18:16:56 +02:00
iucv iucv: af_iucv.c: Couple of typo fixes 2021-03-28 17:31:13 -07:00
kcm kcm: kcmsock.c: Couple of typo fixes 2021-03-28 17:31:13 -07:00
key
l2tp net: l2tp: Fix a typo 2021-03-22 13:17:49 -07:00
l3mdev l3mdev: Correct function names in the kerneldoc comments 2021-03-28 17:56:55 -07:00
lapb net: lapb: Make "lapb_t1timer_running" able to detect an already running timer 2021-03-23 14:14:50 -07:00
llc llc: llc_core.c: COuple of typo fixes 2021-03-28 17:31:13 -07:00
mac80211 Another set of updates, all over the map: 2021-04-20 16:44:04 -07:00
mac802154 net: mac802154: Fix general protection fault 2021-04-06 22:42:16 +02:00
mpls net: avoid infinite loop in mpls_gso_segment when mpls_hlen == 0 2021-03-09 16:12:20 -08:00
mptcp Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-04-26 12:00:00 -07:00
ncsi Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-04-09 20:48:35 -07:00
netfilter netfilter: allow to turn off xtables compat layer 2021-04-26 18:16:56 +02:00
netlabel netlabel: Correct function name netlbl_mgmt_add() in the kerneldoc comments 2021-03-28 17:56:55 -07:00
netlink netlink: don't call ->netlink_bind with table lock held 2021-04-16 17:01:04 -07:00
netrom
nfc Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-04-09 20:48:35 -07:00
nsh
openvswitch Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-04-26 12:00:00 -07:00
packet net/packet: remove data races in fanout operations 2021-04-14 14:34:38 -07:00
phonet
psample psample: Add additional metadata attributes 2021-03-14 15:00:43 -07:00
qrtr Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-04-26 12:00:00 -07:00
rds Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-04-09 20:48:35 -07:00
rfkill Another set of updates, all over the map: 2021-04-20 16:44:04 -07:00
rose net: rose: Fix fall-through warnings for Clang 2021-03-10 12:45:15 -08:00
rxrpc rxrpc: Fix dependency on IPv6 in udp tunnel config 2021-02-12 16:42:05 -08:00
sched net/sched: act_ct: fix wild memory access when clearing fragments 2021-04-26 13:06:39 -07:00
sctp Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-04-17 11:08:07 -07:00
smc net: smc: Remove repeated struct declaration 2021-04-01 15:52:38 -07:00
strparser
sunrpc Miscellaneous NFSD fixes for v5.12-rc. 2021-03-16 10:22:50 -07:00
switchdev net: bridge: propagate extack through switchdev_port_attr_set 2021-02-14 17:38:11 -08:00
tipc Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-04-09 20:48:35 -07:00
tls skmsg: Extract __tcp_bpf_recvmsg() and tcp_bpf_wait_data() 2021-04-01 10:56:14 -07:00
unix
vmw_vsock Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-04-26 12:00:00 -07:00
wireless Another set of updates, all over the map: 2021-04-20 16:44:04 -07:00
x25 af_x25.c: Fix a spello 2021-03-28 17:31:13 -07:00
xdp xsk: Align XDP socket batch size with DPDK 2021-04-23 09:50:35 +02:00
xfrm xfrm: ipcomp: remove unnecessary get_cpu() 2021-04-19 12:49:29 +02:00
compat.c
devres.c
Kconfig net: add generic selftest support 2021-04-20 16:08:02 -07:00
Makefile
socket.c net: Fix a misspell in socket.c 2021-03-25 16:56:27 -07:00
sysctl_net.c net: Ensure net namespace isolation of sysctls 2021-04-12 13:27:11 -07:00