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linux/net/sctp
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Eric Dumazet 65b4693d8b sctp: initialize more fields in sctp_v6_from_sk() 
[ Upstream commit 2e87504692 ]

syzbot found that sin6_scope_id was not properly initialized,
leading to undefined behavior.

Clear sin6_scope_id and sin6_flowinfo.

BUG: KMSAN: uninit-value in __sctp_v6_cmp_addr+0x887/0x8c0 net/sctp/ipv6.c:649
  __sctp_v6_cmp_addr+0x887/0x8c0 net/sctp/ipv6.c:649
  sctp_inet6_cmp_addr+0x4f2/0x510 net/sctp/ipv6.c:983
  sctp_bind_addr_conflict+0x22a/0x3b0 net/sctp/bind_addr.c:390
  sctp_get_port_local+0x21eb/0x2440 net/sctp/socket.c:8452
  sctp_get_port net/sctp/socket.c:8523 [inline]
  sctp_listen_start net/sctp/socket.c:8567 [inline]
  sctp_inet_listen+0x710/0xfd0 net/sctp/socket.c:8636
  __sys_listen_socket net/socket.c:1912 [inline]
  __sys_listen net/socket.c:1927 [inline]
  __do_sys_listen net/socket.c:1932 [inline]
  __se_sys_listen net/socket.c:1930 [inline]
  __x64_sys_listen+0x343/0x4c0 net/socket.c:1930
  x64_sys_call+0x271d/0x3e20 arch/x86/include/generated/asm/syscalls_64.h:51
  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
  do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Local variable addr.i.i created at:
  sctp_get_port net/sctp/socket.c:8515 [inline]
  sctp_listen_start net/sctp/socket.c:8567 [inline]
  sctp_inet_listen+0x650/0xfd0 net/sctp/socket.c:8636
  __sys_listen_socket net/socket.c:1912 [inline]
  __sys_listen net/socket.c:1927 [inline]
  __do_sys_listen net/socket.c:1932 [inline]
  __se_sys_listen net/socket.c:1930 [inline]
  __x64_sys_listen+0x343/0x4c0 net/socket.c:1930

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Reported-by: syzbot+e69f06a0f30116c68056@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/netdev/68adc0a2.050a0220.37038e.00c4.GAE@google.com/T/#u
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Acked-by: Xin Long <lucien.xin@gmail.com>
Link: https://patch.msgid.link/20250826141314.1802610-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-09-04 15:26:29 +02:00
..
associola.c net/sctp: Prevent autoclose integer overflow in sctp_association_init() 2025-01-09 13:30:06 +01:00
auth.c sctp: handle the error returned from sctp_auth_asoc_init_active_key 2022-09-30 12:36:40 +01:00
bind_addr.c sctp: fail if no bound addresses can be used for a given scope 2023-02-01 08:34:46 +01:00
chunk.c net: sctp: chunk.c: delete duplicated word 2020-08-24 16:21:43 -07:00
debug.c sctp: add the probe timer in transport for PLPMTUD 2021-06-22 11:28:52 -07:00
diag.c sctp: sctp_sock_filter(): avoid list_entry() on possibly empty list 2023-02-22 12:59:51 +01:00
endpointola.c sctp: use call_rcu to free endpoint 2021-12-25 17:13:37 +00:00
input.c sctp: Fix null-ptr-deref in reuseport_add_sock(). 2024-08-14 13:52:43 +02:00
inqueue.c net: sctp: fix skb leak in sctp_inq_free() 2024-08-29 17:30:20 +02:00
ipv6.c sctp: initialize more fields in sctp_v6_from_sk() 2025-09-04 15:26:29 +02:00
Kconfig sctp: create udp4 sock and add its encap_rcv 2020-10-30 15:23:52 -07:00
Makefile sctp: rename sctp_diag.c as diag.c 2018-02-13 13:56:31 -05:00
objcnt.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 104 2019-05-24 17:39:00 +02:00
offload.c sctp: remove the NETIF_F_SG flag before calling skb_segment 2021-01-16 19:05:59 -08:00
output.c net: allow gso_max_size to exceed 65536 2022-05-16 10:18:55 +01:00
outqueue.c sctp: clear out_curr if all frag chunks of current msg are pruned 2022-11-07 19:59:01 -08:00
primitive.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 104 2019-05-24 17:39:00 +02:00
proc.c sctp: annotate data-races around sk->sk_wmem_queued 2023-09-19 12:28:00 +02:00
protocol.c ipv4: Drop tos parameter from flowi4_update_output() 2025-05-18 08:21:21 +02:00
sm_make_chunk.c sctp: account stream padding length for reconf chunk 2021-10-14 07:15:22 -07:00
sm_sideeffect.c sctp: handle invalid error codes without calling BUG() 2023-09-13 09:42:25 +02:00
sm_statefuns.c sctp: properly validate chunk size in sctp_sf_ootb() 2024-11-14 13:15:11 +01:00
sm_statetable.c sctp: add the probe timer in transport for PLPMTUD 2021-06-22 11:28:52 -07:00
socket.c sctp: Do not wake readers in __sctp_write_space() 2025-06-27 11:07:33 +01:00
stream.c sctp: Fix undefined behavior in left shift operation 2025-03-28 21:58:52 +01:00
stream_interleave.c sctp: fix a potential overflow in sctp_ifwdtsn_skip 2023-04-20 12:35:09 +02:00
stream_sched.c sctp: fix memory leak in sctp_stream_outq_migrate() 2022-11-29 08:30:50 -08:00
stream_sched_prio.c sctp: add a refcnt in sctp_stream_priorities to avoid a nested loop 2023-03-11 13:55:26 +01:00
stream_sched_rr.c sctp: fix memory leak in sctp_stream_outq_migrate() 2022-11-29 08:30:50 -08:00
sysctl.c sctp: add mutual exclusion in proc_sctp_do_udp_port() 2025-05-22 14:10:09 +02:00
transport.c sctp: detect and prevent references to a freed transport in sendmsg 2025-04-25 10:43:43 +02:00
tsnmap.c net: sctp: trivial: fix typo in comment 2021-03-04 13:48:32 -08:00
ulpevent.c net: remove noblock parameter from recvmsg() entities 2022-04-12 15:00:25 +02:00
ulpqueue.c net: keep sk->sk_forward_alloc as small as possible 2022-06-10 16:21:27 -07:00