Xin Long fd60d8a086 sctp: linearize cloned gso packets in sctp_rcv ... 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>		2025-08-08 13:08:06 -07:00
..
associola.c	sctp: Remove unused sctp_assoc_del_peer and sctp_chunk_iif	2025-05-05 16:51:12 -07:00
auth.c
bind_addr.c
chunk.c
debug.c
diag.c	inet_diag: add module pointer to "struct inet_diag_handler"	2024-01-23 15:13:54 +01:00
endpointola.c
input.c	sctp: linearize cloned gso packets in sctp_rcv	2025-08-08 13:08:06 -07:00
inqueue.c	net: sctp: fix skb leak in sctp_inq_free()	2024-02-15 07:34:52 -08:00
ipv6.c	net: ipv6: Add a flags argument to ip6tunnel_xmit(), udp_tunnel6_xmit_skb()	2025-06-17 18:18:45 -07:00
Kconfig	sctp: use skb_crc32c() instead of __skb_checksum()	2025-05-21 15:40:16 -07:00
Makefile
objcnt.c
offload.c	sctp: use skb_crc32c() instead of __skb_checksum()	2025-05-21 15:40:16 -07:00
output.c	treewide: Switch/rename to timer_delete[_sync]()	2025-04-05 10:30:12 +02:00
outqueue.c	treewide: Switch/rename to timer_delete[_sync]()	2025-04-05 10:30:12 +02:00
primitive.c
proc.c	net: remove sock_i_uid()	2025-06-23 17:04:03 -07:00
protocol.c	net: ipv4: Add a flags argument to iptunnel_xmit(), udp_tunnel_xmit_skb()	2025-06-17 18:18:44 -07:00
sm_make_chunk.c	sctp: Remove unused sctp_assoc_del_peer and sctp_chunk_iif	2025-05-05 16:51:12 -07:00
sm_sideeffect.c	treewide, timers: Rename from_timer() to timer_container_of()	2025-06-08 09:07:37 +02:00
sm_statefuns.c	sctp: properly validate chunk size in sctp_sf_ootb()	2024-11-03 11:03:23 -08:00
sm_statetable.c
socket.c	net: make sk->sk_rcvtimeo lockless	2025-06-23 17:05:12 -07:00
stream_interleave.c
stream_sched_fc.c
stream_sched_prio.c
stream_sched_rr.c
stream_sched.c
stream.c	treewide: Switch/rename to timer_delete[_sync]()	2025-04-05 10:30:12 +02:00
sysctl.c	sctp: add mutual exclusion in proc_sctp_do_udp_port()	2025-04-02 16:04:19 -07:00
transport.c	net: dst: annotate data-races around dst->obsolete	2025-07-02 14:32:29 -07:00
tsnmap.c
ulpevent.c
ulpqueue.c