diff options
author | Chengfeng Ye <dg573847474@gmail.com> | 2023-06-27 12:03:40 +0000 |
---|---|---|
committer | Paolo Abeni <pabeni@redhat.com> | 2023-06-29 11:49:42 +0200 |
commit | 6feb37b3b06e9049e20dcf7e23998f92c9c5be9a (patch) | |
tree | a1e1728562d5fab1ccb07116f9963c5b8ce4a717 /net/9p | |
parent | 7a8227b2e76be506b2ac64d2beac950ca04892a5 (diff) |
sctp: fix potential deadlock on &net->sctp.addr_wq_lock
As &net->sctp.addr_wq_lock is also acquired by the timer
sctp_addr_wq_timeout_handler() in protocal.c, the same lock acquisition
at sctp_auto_asconf_init() seems should disable irq since it is called
from sctp_accept() under process context.
Possible deadlock scenario:
sctp_accept()
-> sctp_sock_migrate()
-> sctp_auto_asconf_init()
-> spin_lock(&net->sctp.addr_wq_lock)
<timer interrupt>
-> sctp_addr_wq_timeout_handler()
-> spin_lock_bh(&net->sctp.addr_wq_lock); (deadlock here)
This flaw was found using an experimental static analysis tool we are
developing for irq-related deadlock.
The tentative patch fix the potential deadlock by spin_lock_bh().
Signed-off-by: Chengfeng Ye <dg573847474@gmail.com>
Fixes: 34e5b0118685 ("sctp: delay auto_asconf init until binding the first addr")
Acked-by: Xin Long <lucien.xin@gmail.com>
Link: https://lore.kernel.org/r/20230627120340.19432-1-dg573847474@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'net/9p')
0 files changed, 0 insertions, 0 deletions