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Eric Dumazet a84d016479 mld: fix memory leak in mld_del_delrec() 
Similar to the fix done for IPv4 in commit e5b1c6c627
("igmp: fix memory leak in igmpv3_del_delrec()"), we need to
make sure mca_tomb and mca_sources are not blindly overwritten.

Using swap() then a call to ip6_mc_clear_src() will take care
of the missing free.

BUG: memory leak
unreferenced object 0xffff888117d9db00 (size 64):
  comm "syz-executor247", pid 6918, jiffies 4294943989 (age 25.350s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 fe 88 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<000000005b463030>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
    [<000000005b463030>] slab_post_alloc_hook mm/slab.h:522 [inline]
    [<000000005b463030>] slab_alloc mm/slab.c:3319 [inline]
    [<000000005b463030>] kmem_cache_alloc_trace+0x145/0x2c0 mm/slab.c:3548
    [<00000000939cbf94>] kmalloc include/linux/slab.h:552 [inline]
    [<00000000939cbf94>] kzalloc include/linux/slab.h:748 [inline]
    [<00000000939cbf94>] ip6_mc_add1_src net/ipv6/mcast.c:2236 [inline]
    [<00000000939cbf94>] ip6_mc_add_src+0x31f/0x420 net/ipv6/mcast.c:2356
    [<00000000d8972221>] ip6_mc_source+0x4a8/0x600 net/ipv6/mcast.c:449
    [<000000002b203d0d>] do_ipv6_setsockopt.isra.0+0x1b92/0x1dd0 net/ipv6/ipv6_sockglue.c:748
    [<000000001f1e2d54>] ipv6_setsockopt+0x89/0xd0 net/ipv6/ipv6_sockglue.c:944
    [<00000000c8f7bdf9>] udpv6_setsockopt+0x4e/0x90 net/ipv6/udp.c:1558
    [<000000005a9a0c5e>] sock_common_setsockopt+0x38/0x50 net/core/sock.c:3139
    [<00000000910b37b2>] __sys_setsockopt+0x10f/0x220 net/socket.c:2084
    [<00000000e9108023>] __do_sys_setsockopt net/socket.c:2100 [inline]
    [<00000000e9108023>] __se_sys_setsockopt net/socket.c:2097 [inline]
    [<00000000e9108023>] __x64_sys_setsockopt+0x26/0x30 net/socket.c:2097
    [<00000000f4818160>] do_syscall_64+0x76/0x1a0 arch/x86/entry/common.c:296
    [<000000008d367e8f>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

Fixes: 1666d49e1d ("mld: do not remove mld souce list info when set link down")
Fixes: 9c8bb163ae ("igmp, mld: Fix memory leak in igmpv3/mld_del_delrec()")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2019-08-28 14:47:35 -07:00
..
ila treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
netfilter inet: frags: re-introduce skb coalescing for local delivery 2019-08-08 15:55:10 -07:00
Kconfig treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
Makefile xfrm: make xfrm modes builtin 2019-04-08 09:15:17 +02:00
addrconf.c ipv6: propagate ipv6_add_dev's error returns out of ipv6_find_idev 2019-08-23 14:53:06 -07:00
addrconf_core.c ipv6: Add delete route hook to stubs 2019-05-22 17:48:43 -07:00
addrlabel.c netlink: make validation more configurable for future strictness 2019-04-27 17:07:21 -04:00
af_inet6.c ipv6: use indirect call wrappers for {tcp, udpv6}_{recv, send}msg() 2019-07-03 13:51:54 -07:00
ah6.c ipv6: Use ipv6_authlen for len 2019-07-11 14:43:25 -07:00
anycast.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
calipso.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13 2019-05-21 11:28:45 +02:00
datagram.c ipv6: fix potential crash in ip6_datagram_dst_update() 2019-07-11 14:43:25 -07:00
esp6.c xfrm: remove get_mtu indirection from xfrm_type 2019-07-01 06:16:40 +02:00
esp6_offload.c Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next 2019-07-05 15:01:15 -07:00
exthdrs.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
exthdrs_core.c ipv6: Use ipv6_authlen for len 2019-07-11 14:43:25 -07:00
exthdrs_offload.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
fib6_notifier.c net: Add module reference to FIB notifiers 2017-09-01 20:33:42 -07:00
fib6_rules.c ipv6: honor RT6_LOOKUP_F_DST_NOREF in rule lookup logic 2019-06-23 13:24:17 -07:00
fou6.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
icmp.c ipv6: icmp: allow flowlabel reflection in echo replies 2019-07-01 10:54:51 -07:00
inet6_connection_sock.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
inet6_hashtables.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-06-07 11:00:14 -07:00
ip6_checksum.c net: udp: fix handling of CHECKSUM_COMPLETE packets 2018-10-24 14:18:16 -07:00
ip6_fib.c ipv6: Unlink sibling route in case of failure 2019-07-18 12:01:43 -07:00
ip6_flowlabel.c ipv6: fix static key imbalance in fl_create() 2019-07-11 14:43:25 -07:00
ip6_gre.c ip6_gre: reload ipv6h in prepare_ip6gre_xmit_ipv6 2019-07-24 13:59:25 -07:00
ip6_icmp.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ip6_input.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
ip6_offload.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
ip6_offload.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
ip6_output.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-06-27 21:06:39 -07:00
ip6_tunnel.c ip6_tunnel: fix possible use-after-free on xmit 2019-07-26 14:17:44 -07:00
ip6_udp_tunnel.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
ip6_vti.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
ip6mr.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
ipcomp6.c xfrm: remove type and offload_type map from xfrm_state_afinfo 2019-06-06 08:34:50 +02:00
ipv6_sockglue.c SPDX update for 5.2-rc3, round 1 2019-05-31 08:34:32 -07:00
mcast.c mld: fix memory leak in mld_del_delrec() 2019-08-28 14:47:35 -07:00
mcast_snoop.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 343 2019-06-05 17:37:07 +02:00
mip6.c xfrm: remove type and offload_type map from xfrm_state_afinfo 2019-06-06 08:34:50 +02:00
ndisc.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-06-07 11:00:14 -07:00
netfilter.c netfilter: synproxy: fix building syncookie calls 2019-06-20 11:59:36 +02:00
output_core.c treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
ping.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
proc.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-06-07 11:00:14 -07:00
protocol.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
raw.c ipv6: elide flowlabel check if no exclusive leases exist 2019-07-08 19:38:03 -07:00
reassembly.c inet: frags: re-introduce skb coalescing for local delivery 2019-08-08 15:55:10 -07:00
route.c ipv6: Fix unbalanced rcu locking in rt6_update_exception_stamp_rt 2019-08-05 13:16:58 -07:00
seg6.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
seg6_hmac.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
seg6_iptunnel.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
seg6_local.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
sit.c sit: use dst_cache in ipip6_tunnel_xmit 2019-07-14 12:15:28 -07:00
syncookies.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
sysctl_net_ipv6.c proc/sysctl: add shared variables for range check 2019-07-18 17:08:07 -07:00
tcp_ipv6.c ipv6: tcp: fix flowlabels reflection for RST packets 2019-07-11 14:43:25 -07:00
tcpv6_offload.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
tunnel6.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13 2019-05-21 11:28:45 +02:00
udp.c ipv6: elide flowlabel check if no exclusive leases exist 2019-07-08 19:38:03 -07:00
udp_impl.h udp6: add missing rehash callback to udplite 2019-01-17 15:01:08 -08:00
udp_offload.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
udplite.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
xfrm6_input.c net: use skb_sec_path helper in more places 2018-12-19 11:21:37 -08:00
xfrm6_output.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
xfrm6_policy.c xfrm: remove decode_session indirection from afinfo_policy 2019-04-23 07:42:20 +02:00
xfrm6_protocol.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
xfrm6_state.c xfrm: remove eth_proto value from xfrm_state_afinfo 2019-06-06 08:34:50 +02:00
xfrm6_tunnel.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13 2019-05-21 11:28:45 +02:00