Xin Long 7d757f17bc sctp: linearize cloned gso packets in sctp_rcv ... [ Upstream commit fd60d8a086191fe33c2d719732d2482052fa6805 ] A cloned head skb still shares these frag skbs in fraglist with the original head skb. It's not safe to access these frag skbs. syzbot reported two use-of-uninitialized-memory bugs caused by this: BUG: KMSAN: uninit-value in sctp_inq_pop+0x15b7/0x1920 net/sctp/inqueue.c:211 sctp_inq_pop+0x15b7/0x1920 net/sctp/inqueue.c:211 sctp_assoc_bh_rcv+0x1a7/0xc50 net/sctp/associola.c:998 sctp_inq_push+0x2ef/0x380 net/sctp/inqueue.c:88 sctp_backlog_rcv+0x397/0xdb0 net/sctp/input.c:331 sk_backlog_rcv+0x13b/0x420 include/net/sock.h:1122 __release_sock+0x1da/0x330 net/core/sock.c:3106 release_sock+0x6b/0x250 net/core/sock.c:3660 sctp_wait_for_connect+0x487/0x820 net/sctp/socket.c:9360 sctp_sendmsg_to_asoc+0x1ec1/0x1f00 net/sctp/socket.c:1885 sctp_sendmsg+0x32b9/0x4a80 net/sctp/socket.c:2031 inet_sendmsg+0x25a/0x280 net/ipv4/af_inet.c:851 sock_sendmsg_nosec net/socket.c:718 [inline] and BUG: KMSAN: uninit-value in sctp_assoc_bh_rcv+0x34e/0xbc0 net/sctp/associola.c:987 sctp_assoc_bh_rcv+0x34e/0xbc0 net/sctp/associola.c:987 sctp_inq_push+0x2a3/0x350 net/sctp/inqueue.c:88 sctp_backlog_rcv+0x3c7/0xda0 net/sctp/input.c:331 sk_backlog_rcv+0x142/0x420 include/net/sock.h:1148 __release_sock+0x1d3/0x330 net/core/sock.c:3213 release_sock+0x6b/0x270 net/core/sock.c:3767 sctp_wait_for_connect+0x458/0x820 net/sctp/socket.c:9367 sctp_sendmsg_to_asoc+0x223a/0x2260 net/sctp/socket.c:1886 sctp_sendmsg+0x3910/0x49f0 net/sctp/socket.c:2032 inet_sendmsg+0x269/0x2a0 net/ipv4/af_inet.c:851 sock_sendmsg_nosec net/socket.c:712 [inline] This patch fixes it by linearizing cloned gso packets in sctp_rcv(). Fixes: 90017accff ("sctp: Add GSO support") Reported-by: syzbot+773e51afe420baaf0e2b@syzkaller.appspotmail.com Reported-by: syzbot+70a42f45e76bede082be@syzkaller.appspotmail.com Signed-off-by: Xin Long <lucien.xin@gmail.com> Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Link: https://patch.msgid.link/dd7dc337b99876d4132d0961f776913719f7d225.1754595611.git.lucien.xin@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2025-08-20 18:30:18 +02:00
..
associola.c	net/sctp: Prevent autoclose integer overflow in sctp_association_init()	2025-01-09 13:33:51 +01:00
auth.c	sctp: delete the nested flexible array hmac	2023-04-21 08:19:30 +01:00
bind_addr.c	sctp: fail if no bound addresses can be used for a given scope	2023-01-24 18:32:33 -08:00
chunk.c
debug.c	sctp: add the probe timer in transport for PLPMTUD	2021-06-22 11:28:52 -07:00
diag.c	inet_diag: add module pointer to "struct inet_diag_handler"	2024-01-23 15:13:54 +01:00
endpointola.c	sctp: add dif and sdif check in asoc and ep lookup	2022-11-18 11:42:54 +00:00
input.c	sctp: linearize cloned gso packets in sctp_rcv	2025-08-20 18:30:18 +02:00
inqueue.c	net: sctp: fix skb leak in sctp_inq_free()	2024-02-15 07:34:52 -08:00
ipv6.c	sctp: fix possible UAF in sctp_v6_available()	2024-11-09 09:15:04 -08:00
Kconfig
Makefile	sctp: add fair capacity stream scheduler	2023-03-09 11:31:44 +01:00
objcnt.c
offload.c	net: move gso declarations and functions to their own files	2023-06-10 00:11:41 -07:00
output.c	net: allow gso_max_size to exceed 65536	2022-05-16 10:18:55 +01:00
outqueue.c	sctp: delete the nested flexible array variable	2023-04-21 08:19:29 +01:00
primitive.c
proc.c	sctp: annotate data-races around sk->sk_wmem_queued	2023-08-31 11:56:59 +02:00
protocol.c	sctp: Unmask upper DSCP bits in sctp_v4_get_dst()	2024-09-09 14:14:53 +01:00
sm_make_chunk.c	sctp: Spelling s/preceeding/preceding/g	2023-10-04 14:04:58 -07:00
sm_sideeffect.c	sctp: handle invalid error codes without calling BUG()	2023-06-12 09:36:27 +01:00
sm_statefuns.c	sctp: properly validate chunk size in sctp_sf_ootb()	2024-11-03 11:03:23 -08:00
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 11:11:29 +01:00
stream_interleave.c	sctp: delete the nested flexible array skip	2023-04-21 08:19:29 +01:00
stream_sched_fc.c	sctp: add weighted fair queueing stream scheduler	2023-03-09 11:31:44 +01:00
stream_sched_prio.c	sctp: add a refcnt in sctp_stream_priorities to avoid a nested loop	2023-02-23 12:59:40 -08:00
stream_sched_rr.c	sctp: delete free member from struct sctp_sched_ops	2022-12-01 20:14:23 -08:00
stream_sched.c	sctp: fix a potential OOB access in sctp_sched_set_sched()	2023-05-10 12:10:15 +01:00
stream.c	sctp: Fix undefined behavior in left shift operation	2025-03-22 12:54:19 -07:00
sysctl.c	sctp: add mutual exclusion in proc_sctp_do_udp_port()	2025-04-10 14:39:34 +02:00
transport.c	sctp: detect and prevent references to a freed transport in sendmsg	2025-04-20 10:15:50 +02:00
tsnmap.c
ulpevent.c	net: remove noblock parameter from recvmsg() entities	2022-04-12 15:00:25 +02:00
ulpqueue.c	sctp: remove unnecessary NULL check in sctp_ulpq_tail_event()	2022-10-20 21:43:10 -07:00