Eric Dumazet 10206302af sctp: add mutual exclusion in proc_sctp_do_udp_port() ... We must serialize calls to sctp_udp_sock_stop() and sctp_udp_sock_start() or risk a crash as syzbot reported: Oops: general protection fault, probably for non-canonical address 0xdffffc000000000d: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000068-0x000000000000006f] CPU: 1 UID: 0 PID: 6551 Comm: syz.1.44 Not tainted 6.14.0-syzkaller-g7f2ff7b62617 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:kernel_sock_shutdown+0x47/0x70 net/socket.c:3653 Call Trace: <TASK> udp_tunnel_sock_release+0x68/0x80 net/ipv4/udp_tunnel_core.c:181 sctp_udp_sock_stop+0x71/0x160 net/sctp/protocol.c:930 proc_sctp_do_udp_port+0x264/0x450 net/sctp/sysctl.c:553 proc_sys_call_handler+0x3d0/0x5b0 fs/proc/proc_sysctl.c:601 iter_file_splice_write+0x91c/0x1150 fs/splice.c:738 do_splice_from fs/splice.c:935 [inline] direct_splice_actor+0x18f/0x6c0 fs/splice.c:1158 splice_direct_to_actor+0x342/0xa30 fs/splice.c:1102 do_splice_direct_actor fs/splice.c:1201 [inline] do_splice_direct+0x174/0x240 fs/splice.c:1227 do_sendfile+0xafd/0xe50 fs/read_write.c:1368 __do_sys_sendfile64 fs/read_write.c:1429 [inline] __se_sys_sendfile64 fs/read_write.c:1415 [inline] __x64_sys_sendfile64+0x1d8/0x220 fs/read_write.c:1415 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] Fixes: 046c052b47 ("sctp: enable udp tunneling socks") Reported-by: syzbot+fae49d997eb56fa7c74d@syzkaller.appspotmail.com Closes: https://lore.kernel.org/netdev/67ea5c01.050a0220.1547ec.012b.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/20250331091532.224982-1-edumazet@google.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>		2025-04-02 16:04:19 -07:00
..
associola.c	net/sctp: Prevent autoclose integer overflow in sctp_association_init()	2024-12-23 10:10:13 -08:00
auth.c
bind_addr.c
chunk.c
debug.c
diag.c
endpointola.c
input.c	sctp: Fix null-ptr-deref in reuseport_add_sock().	2024-08-02 16:25:06 -07:00
inqueue.c	net: sctp: fix skb leak in sctp_inq_free()	2024-02-15 07:34:52 -08:00
ipv6.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2024-11-14 11:29:15 -08:00
Kconfig
Makefile
objcnt.c
offload.c
output.c
outqueue.c
primitive.c
proc.c
protocol.c	net: use sock_kmemdup for ip_options	2025-03-03 17:16:34 -08:00
sm_make_chunk.c
sm_sideeffect.c
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	sctp: ensure sk_state is set to CLOSED if hashing fails in sctp_listen_start	2024-10-09 13:36:32 +01:00
stream_interleave.c
stream_sched_fc.c
stream_sched_prio.c
stream_sched_rr.c
stream_sched.c
stream.c	sctp: Fix undefined behavior in left shift operation	2025-02-19 18:55:40 -08:00
sysctl.c	sctp: add mutual exclusion in proc_sctp_do_udp_port()	2025-04-02 16:04:19 -07:00
transport.c
tsnmap.c
ulpevent.c
ulpqueue.c