WSL2-Linux-Kernel/net/sctp
Xin Long 68ba446395 sctp: add a refcnt in sctp_stream_priorities to avoid a nested loop
With this refcnt added in sctp_stream_priorities, we don't need to
traverse all streams to check if the prio is used by other streams
when freeing one stream's prio in sctp_sched_prio_free_sid(). This
can avoid a nested loop (up to 65535 * 65535), which may cause a
stuck as Ying reported:

    watchdog: BUG: soft lockup - CPU#23 stuck for 26s! [ksoftirqd/23:136]
    Call Trace:
     <TASK>
     sctp_sched_prio_free_sid+0xab/0x100 [sctp]
     sctp_stream_free_ext+0x64/0xa0 [sctp]
     sctp_stream_free+0x31/0x50 [sctp]
     sctp_association_free+0xa5/0x200 [sctp]

Note that it doesn't need to use refcount_t type for this counter,
as its accessing is always protected under the sock lock.

v1->v2:
 - add a check in sctp_sched_prio_set to avoid the possible prio_head
   refcnt overflow.

Fixes: 9ed7bfc795 ("sctp: fix memory leak in sctp_stream_outq_migrate()")
Reported-by: Ying Xu <yinxu@redhat.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Link: https://lore.kernel.org/r/825eb0c905cb864991eba335f4a2b780e543f06b.1677085641.git.lucien.xin@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2023-02-23 12:59:40 -08:00
..
Kconfig
Makefile
associola.c
auth.c
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
diag.c sctp: sctp_sock_filter(): avoid list_entry() on possibly empty list 2023-02-10 19:28:29 -08:00
endpointola.c
input.c
inqueue.c
ipv6.c net: no longer support SOCK_REFCNT_DEBUG feature 2023-02-15 10:25:21 +00:00
objcnt.c
offload.c
output.c
outqueue.c
primitive.c
proc.c
protocol.c net: no longer support SOCK_REFCNT_DEBUG feature 2023-02-15 10:25:21 +00:00
sm_make_chunk.c
sm_sideeffect.c
sm_statefuns.c
sm_statetable.c
socket.c inet: Add IP_LOCAL_PORT_RANGE socket option 2023-01-25 22:45:00 -08:00
stream.c
stream_interleave.c
stream_sched.c
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
sysctl.c sctp: sysctl: make extra pointers netns aware 2022-12-12 12:57:29 -08:00
transport.c sctp: do not check hb_timer.expires when resetting hb_timer 2023-01-31 21:01:28 -08:00
tsnmap.c
ulpevent.c
ulpqueue.c