diff options
| author | Gao Feng <gfree.wind@vip.163.com> | 2017-07-31 18:07:38 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-07-31 21:59:01 -0700 |
| commit | ddab82821fa633da768879fc515e76dcb1207151 (patch) | |
| tree | def23da2ae52a44b740d23c50b12126a592b9f05 /crypto/cmac.c | |
| parent | 00d51094b8a5856ae790048a332ae24f1dd7c994 (diff) | |
| download | linux-ddab82821fa633da768879fc515e76dcb1207151.tar.gz | |
ppp: Fix a scheduling-while-atomic bug in del_chan
The PPTP set the pptp_sock_destruct as the sock's sk_destruct, it would trigger this bug when __sk_free is invoked in atomic context, because of the call path pptp_sock_destruct->del_chan->synchronize_rcu. Now move the synchronize_rcu to pptp_release from del_chan. This is the only one case which would free the sock and need the synchronize_rcu. The following is the panic I met with kernel 3.3.8, but this issue should exist in current kernel too according to the codes. BUG: scheduling while atomic __schedule_bug+0x5e/0x64 __schedule+0x55/0x580 ? ppp_unregister_channel+0x1cd5/0x1de0 [ppp_generic] ? dev_hard_start_xmit+0x423/0x530 ? sch_direct_xmit+0x73/0x170 __cond_resched+0x16/0x30 _cond_resched+0x22/0x30 wait_for_common+0x18/0x110 ? call_rcu_bh+0x10/0x10 wait_for_completion+0x12/0x20 wait_rcu_gp+0x34/0x40 ? wait_rcu_gp+0x40/0x40 synchronize_sched+0x1e/0x20 0xf8417298 0xf8417484 ? sock_queue_rcv_skb+0x109/0x130 __sk_free+0x16/0x110 ? udp_queue_rcv_skb+0x1f2/0x290 sk_free+0x16/0x20 __udp4_lib_rcv+0x3b8/0x650 Signed-off-by: Gao Feng <gfree.wind@vip.163.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'crypto/cmac.c')
0 files changed, 0 insertions, 0 deletions