B.A.T.M.A.N March 2020

b.a.t.m.a.n@lists.open-mesh.org

21 participants
21 discussions

INFO: rcu detected stall in netlink_sendmsg (4)
by syzbot 24 Jul '20

24 Jul '20

Hello, syzbot found the following crash on: HEAD commit: ae661dec Merge branch 'ifla_xdp_expected_fd' git tree: bpf-next console output: https://syzkaller.appspot.com/x/log.txt?x=12245647e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=b5acf5ac38a50651 dashboard link: https://syzkaller.appspot.com/bug?extid=0fb70e87d8e0ac278fe9 compiler: gcc (GCC) 9.0.0 20181231 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+0fb70e87d8e0ac278fe9(a)syzkaller.appspotmail.com rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (1 GPs behind) idle=5c2/1/0x4000000000000002 softirq=376075/376076 fqs=5176 (t=10500 jiffies g=506061 q=176208) NMI backtrace for cpu 0 CPU: 0 PID: 17281 Comm: syz-executor.5 Not tainted 5.6.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <IRQ> __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x188/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x231/0x27e lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x169/0x1b3 kernel/rcu/tree_stall.h:254 print_cpu_stall kernel/rcu/tree_stall.h:475 [inline] check_cpu_stall kernel/rcu/tree_stall.h:549 [inline] rcu_pending kernel/rcu/tree.c:3030 [inline] rcu_sched_clock_irq.cold+0x518/0xc55 kernel/rcu/tree.c:2276 update_process_times+0x25/0x60 kernel/time/timer.c:1726 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:171 tick_sched_timer+0x4e/0x140 kernel/time/tick-sched.c:1314 __run_hrtimer kernel/time/hrtimer.c:1517 [inline] __hrtimer_run_queues+0x32c/0xdd0 kernel/time/hrtimer.c:1579 hrtimer_interrupt+0x312/0x770 kernel/time/hrtimer.c:1641 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1119 [inline] smp_apic_timer_interrupt+0x15b/0x600 arch/x86/kernel/apic/apic.c:1144 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 </IRQ> RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:759 [inline] RIP: 0010:lock_release+0x45f/0x7c0 kernel/locking/lockdep.c:4505 Code: 94 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 d0 02 00 00 48 83 3d 6d 1d 1b 08 00 0f 84 71 01 00 00 48 8b 3c 24 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 01 c3 48 c7 03 00 RSP: 0018:ffffc90003d9ec30 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff12e7698 RBX: 1ffff920007b3d89 RCX: 1ffff110098769b9 RDX: dffffc0000000000 RSI: 1ffff110098769c5 RDI: 0000000000000282 RBP: ffff88804c3b4540 R08: 0000000000000004 R09: fffffbfff14cc269 R10: fffffbfff14cc268 R11: ffffffff8a661347 R12: bc95c6993a9665e0 R13: ffffffff87a36fb1 R14: ffff88804c3b4dd0 R15: 0000000000000003 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:174 [inline] _raw_spin_unlock_bh+0x12/0x30 kernel/locking/spinlock.c:207 spin_unlock_bh include/linux/spinlock.h:383 [inline] batadv_tt_local_purge_pending_clients+0x2a1/0x3b0 net/batman-adv/translation-table.c:3914 batadv_tt_local_resize_to_mtu+0x96/0x130 net/batman-adv/translation-table.c:4198 batadv_update_min_mtu net/batman-adv/hard-interface.c:626 [inline] batadv_hardif_activate_interface.part.0.cold+0xc6/0x294 net/batman-adv/hard-interface.c:653 batadv_hardif_activate_interface net/batman-adv/hard-interface.c:800 [inline] batadv_hardif_enable_interface+0x9f2/0xaa0 net/batman-adv/hard-interface.c:792 batadv_softif_slave_add+0x92/0x150 net/batman-adv/soft-interface.c:859 do_set_master net/core/rtnetlink.c:2470 [inline] do_set_master+0x1d7/0x230 net/core/rtnetlink.c:2443 do_setlink+0xaa2/0x3680 net/core/rtnetlink.c:2605 __rtnl_newlink+0xad5/0x1590 net/core/rtnetlink.c:3266 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3391 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5454 netlink_rcv_skb+0x15a/0x410 net/netlink/af_netlink.c:2478 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x537/0x740 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x882/0xe10 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6b9/0x7d0 net/socket.c:2343 ___sys_sendmsg+0x100/0x170 net/socket.c:2397 __sys_sendmsg+0xec/0x1b0 net/socket.c:2430 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c849 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f043b72fc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f043b7306d4 RCX: 000000000045c849 RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000003 RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000009f5 R14: 00000000004ccac9 R15: 000000000076bf0c --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller(a)googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

1 2

kernel panic: smack: Failed to initialize cipso DOI.
by syzbot 30 Mar '20

30 Mar '20

Hello, syzbot found the following crash on: HEAD commit: 1b649e0b Merge git://git.kernel.org/pub/scm/linux/kernel/g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14957099e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=4ac76c43beddbd9 dashboard link: https://syzkaller.appspot.com/bug?extid=89731ccb6fec15ce1c22 compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1202c375e00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1390bb03e00000 The bug was bisected to: commit a9d2d53a788a9c5bc8a7d1b4ea7857b68e221357 Author: Ken Cox <jkc(a)redhat.com> Date: Tue Nov 15 19:00:37 2016 +0000 ixgbe: test for trust in macvlan adjustments for VF bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=13cb06f3e00000 final crash: https://syzkaller.appspot.com/x/report.txt?x=102b06f3e00000 console output: https://syzkaller.appspot.com/x/log.txt?x=17cb06f3e00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+89731ccb6fec15ce1c22(a)syzkaller.appspotmail.com Fixes: a9d2d53a788a ("ixgbe: test for trust in macvlan adjustments for VF") RSP: 002b:00007ffebd499a38 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007ffebd499a40 RCX: 00000000004404e9 RDX: 0000000000000014 RSI: 0000000020000040 RDI: 0000000000000003 RBP: 0000000000000004 R08: 0000000000000001 R09: 00007ffebd490031 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401dd0 R13: 0000000000401e60 R14: 0000000000000000 R15: 0000000000000000 Kernel panic - not syncing: smack: Failed to initialize cipso DOI. CPU: 1 PID: 7197 Comm: syz-executor480 Not tainted 5.6.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1e9/0x30e lib/dump_stack.c:118 panic+0x264/0x7a0 kernel/panic.c:221 smk_cipso_doi+0x4d8/0x4e0 security/smack/smackfs.c:698 smk_write_doi+0x123/0x190 security/smack/smackfs.c:1595 __vfs_write+0xa7/0x710 fs/read_write.c:494 vfs_write+0x271/0x570 fs/read_write.c:558 ksys_write+0x115/0x220 fs/read_write.c:611 do_syscall_64+0xf3/0x1b0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4404e9 Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 5b 14 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffebd499a38 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007ffebd499a40 RCX: 00000000004404e9 RDX: 0000000000000014 RSI: 0000000020000040 RDI: 0000000000000003 RBP: 0000000000000004 R08: 0000000000000001 R09: 00007ffebd490031 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401dd0 R13: 0000000000401e60 R14: 0000000000000000 R15: 0000000000000000 Kernel Offset: disabled Rebooting in 86400 seconds.. --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller(a)googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches

2 1

Re: KASAN: null-ptr-deref Write in blk_mq_map_swqueue
by syzbot 27 Mar '20

27 Mar '20

syzbot has bisected this bug to: commit 768134d4f48109b90f4248feecbeeb7d684e410c Author: Jens Axboe <axboe(a)kernel.dk> Date: Mon Nov 11 03:30:53 2019 +0000 io_uring: don't do flush cancel under inflight_lock bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14233ef5e00000 start commit: 1b649e0b Merge git://git.kernel.org/pub/scm/linux/kernel/g.. git tree: upstream final crash: https://syzkaller.appspot.com/x/report.txt?x=16233ef5e00000 console output: https://syzkaller.appspot.com/x/log.txt?x=12233ef5e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=27392dd2975fd692 dashboard link: https://syzkaller.appspot.com/bug?extid=313d95e8a7a49263f88d syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13850447e00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=119a26f5e00000 Reported-by: syzbot+313d95e8a7a49263f88d(a)syzkaller.appspotmail.com Fixes: 768134d4f481 ("io_uring: don't do flush cancel under inflight_lock") For information about bisection process see: https://goo.gl/tpsmEJ#bisection

3 2

[PATCH] batman-adv: Fix spelling error in term buffer
by Sven Eckelmann 26 Mar '20

26 Mar '20

checkpatch warns about a typo in the word bufFer which was introduced in commit 2191c1bcbc64 ("batman-adv: kernel doc for types.h"). Signed-off-by: Sven Eckelmann <sven(a)narfation.org> --- net/batman-adv/types.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h index 6854cb2b..d8f754d1 100644 --- a/net/batman-adv/types.h +++ b/net/batman-adv/types.h @@ -711,7 +711,7 @@ struct batadv_priv_bla { /** * struct batadv_priv_debug_log - debug logging data - * @log_buff: buffer holding the logs (ring bufer) + * @log_buff: buffer holding the logs (ring buffer) * @log_start: index of next character to read * @log_end: index of next character to write * @lock: lock protecting log_buff, log_start & log_end -- 2.20.1

1 0

Re: KASAN: use-after-free Write in hci_sock_bind (2)
by syzbot 23 Mar '20

23 Mar '20

syzbot has bisected this bug to: commit 7d13eca09ed5e477f6ecfd97a35058762228b5e4 Author: Florian Fainelli <f.fainelli(a)gmail.com> Date: Sat Aug 27 22:34:20 2016 +0000 Documentation: networking: dsa: Remove platform device TODO bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1746f3f9e00000 start commit: 770fbb32 Add linux-next specific files for 20200228 git tree: linux-next final crash: https://syzkaller.appspot.com/x/report.txt?x=14c6f3f9e00000 console output: https://syzkaller.appspot.com/x/log.txt?x=10c6f3f9e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=576314276bce4ad5 dashboard link: https://syzkaller.appspot.com/bug?extid=04e804c8c2224b6a9497 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11fc5e75e00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10707013e00000 Reported-by: syzbot+04e804c8c2224b6a9497(a)syzkaller.appspotmail.com Fixes: 7d13eca09ed5 ("Documentation: networking: dsa: Remove platform device TODO") For information about bisection process see: https://goo.gl/tpsmEJ#bisection

1 0

Re: general protection fault in sctp_ulpevent_nofity_peer_addr_change
by syzbot 20 Mar '20

20 Mar '20

syzbot has bisected this bug to: commit da2648390ce3d409218b6bbbf2386d8ddeec2265 Author: Lubomir Rintel <lkundrak(a)v3.sk> Date: Thu Dec 20 18:13:09 2018 +0000 pxa168fb: trivial typo fix bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1361e139e00000 start commit: 5076190d mm: slub: be more careful about the double cmpxch.. git tree: upstream final crash: https://syzkaller.appspot.com/x/report.txt?x=10e1e139e00000 console output: https://syzkaller.appspot.com/x/log.txt?x=1761e139e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=9f894bd92023de02 dashboard link: https://syzkaller.appspot.com/bug?extid=3950016bd95c2ca0377b userspace arch: i386 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1162bbe3e00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13c93b45e00000 Reported-by: syzbot+3950016bd95c2ca0377b(a)syzkaller.appspotmail.com Fixes: da2648390ce3 ("pxa168fb: trivial typo fix") For information about bisection process see: https://goo.gl/tpsmEJ#bisection

2 1

[PATCH AUTOSEL 4.9 01/15] batman-adv: Don't schedule OGM for disabled interface
by Sasha Levin 18 Mar '20

18 Mar '20

From: Sven Eckelmann <sven(a)narfation.org> [ Upstream commit 8e8ce08198de193e3d21d42e96945216e3d9ac7f ] A transmission scheduling for an interface which is currently dropped by batadv_iv_ogm_iface_disable could still be in progress. The B.A.T.M.A.N. V is simply cancelling the workqueue item in an synchronous way but this is not possible with B.A.T.M.A.N. IV because the OGM submissions are intertwined. Instead it has to stop submitting the OGM when it detect that the buffer pointer is set to NULL. Reported-by: syzbot+a98f2016f40b9cd3818a(a)syzkaller.appspotmail.com Reported-by: syzbot+ac36b6a33c28a491e929(a)syzkaller.appspotmail.com Fixes: c6c8fea29769 ("net: Add batman-adv meshing protocol") Signed-off-by: Sven Eckelmann <sven(a)narfation.org> Cc: Hillf Danton <hdanton(a)sina.com> Signed-off-by: Simon Wunderlich <sw(a)simonwunderlich.de> Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- net/batman-adv/bat_iv_ogm.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c index 780700fcbe63e..b08e3b331c503 100644 --- a/net/batman-adv/bat_iv_ogm.c +++ b/net/batman-adv/bat_iv_ogm.c @@ -934,6 +934,10 @@ static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface) (hard_iface->if_status == BATADV_IF_TO_BE_REMOVED)) return; + /* interface already disabled by batadv_iv_ogm_iface_disable */ + if (!*ogm_buff) + return; + /* the interface gets activated here to avoid race conditions between * the moment of activating the interface in * hardif_activate_interface() where the originator mac is set and -- 2.20.1

1 0

[PATCH AUTOSEL 4.14 03/28] batman-adv: Don't schedule OGM for disabled interface
by Sasha Levin 18 Mar '20

18 Mar '20

From: Sven Eckelmann <sven(a)narfation.org> [ Upstream commit 8e8ce08198de193e3d21d42e96945216e3d9ac7f ] A transmission scheduling for an interface which is currently dropped by batadv_iv_ogm_iface_disable could still be in progress. The B.A.T.M.A.N. V is simply cancelling the workqueue item in an synchronous way but this is not possible with B.A.T.M.A.N. IV because the OGM submissions are intertwined. Instead it has to stop submitting the OGM when it detect that the buffer pointer is set to NULL. Reported-by: syzbot+a98f2016f40b9cd3818a(a)syzkaller.appspotmail.com Reported-by: syzbot+ac36b6a33c28a491e929(a)syzkaller.appspotmail.com Fixes: c6c8fea29769 ("net: Add batman-adv meshing protocol") Signed-off-by: Sven Eckelmann <sven(a)narfation.org> Cc: Hillf Danton <hdanton(a)sina.com> Signed-off-by: Simon Wunderlich <sw(a)simonwunderlich.de> Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- net/batman-adv/bat_iv_ogm.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c index 8b3f9441b3a01..5d5e5401a9ea2 100644 --- a/net/batman-adv/bat_iv_ogm.c +++ b/net/batman-adv/bat_iv_ogm.c @@ -926,6 +926,10 @@ static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface) (hard_iface->if_status == BATADV_IF_TO_BE_REMOVED)) return; + /* interface already disabled by batadv_iv_ogm_iface_disable */ + if (!*ogm_buff) + return; + /* the interface gets activated here to avoid race conditions between * the moment of activating the interface in * hardif_activate_interface() where the originator mac is set and -- 2.20.1

1 0

[PATCH AUTOSEL 4.19 03/37] batman-adv: Don't schedule OGM for disabled interface
by Sasha Levin 18 Mar '20

18 Mar '20

From: Sven Eckelmann <sven(a)narfation.org> [ Upstream commit 8e8ce08198de193e3d21d42e96945216e3d9ac7f ] A transmission scheduling for an interface which is currently dropped by batadv_iv_ogm_iface_disable could still be in progress. The B.A.T.M.A.N. V is simply cancelling the workqueue item in an synchronous way but this is not possible with B.A.T.M.A.N. IV because the OGM submissions are intertwined. Instead it has to stop submitting the OGM when it detect that the buffer pointer is set to NULL. Reported-by: syzbot+a98f2016f40b9cd3818a(a)syzkaller.appspotmail.com Reported-by: syzbot+ac36b6a33c28a491e929(a)syzkaller.appspotmail.com Fixes: c6c8fea29769 ("net: Add batman-adv meshing protocol") Signed-off-by: Sven Eckelmann <sven(a)narfation.org> Cc: Hillf Danton <hdanton(a)sina.com> Signed-off-by: Simon Wunderlich <sw(a)simonwunderlich.de> Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- net/batman-adv/bat_iv_ogm.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c index f5941837c3ad4..0b052ff51bdeb 100644 --- a/net/batman-adv/bat_iv_ogm.c +++ b/net/batman-adv/bat_iv_ogm.c @@ -970,6 +970,10 @@ static void batadv_iv_ogm_schedule_buff(struct batadv_hard_iface *hard_iface) lockdep_assert_held(&hard_iface->bat_iv.ogm_buff_mutex); + /* interface already disabled by batadv_iv_ogm_iface_disable */ + if (!*ogm_buff) + return; + /* the interface gets activated here to avoid race conditions between * the moment of activating the interface in * hardif_activate_interface() where the originator mac is set and -- 2.20.1

1 0

[PATCH AUTOSEL 5.4 04/73] batman-adv: Don't schedule OGM for disabled interface
by Sasha Levin 18 Mar '20

18 Mar '20

From: Sven Eckelmann <sven(a)narfation.org> [ Upstream commit 8e8ce08198de193e3d21d42e96945216e3d9ac7f ] A transmission scheduling for an interface which is currently dropped by batadv_iv_ogm_iface_disable could still be in progress. The B.A.T.M.A.N. V is simply cancelling the workqueue item in an synchronous way but this is not possible with B.A.T.M.A.N. IV because the OGM submissions are intertwined. Instead it has to stop submitting the OGM when it detect that the buffer pointer is set to NULL. Reported-by: syzbot+a98f2016f40b9cd3818a(a)syzkaller.appspotmail.com Reported-by: syzbot+ac36b6a33c28a491e929(a)syzkaller.appspotmail.com Fixes: c6c8fea29769 ("net: Add batman-adv meshing protocol") Signed-off-by: Sven Eckelmann <sven(a)narfation.org> Cc: Hillf Danton <hdanton(a)sina.com> Signed-off-by: Simon Wunderlich <sw(a)simonwunderlich.de> Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- net/batman-adv/bat_iv_ogm.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c index 5b0b20e6da956..d88a4de022372 100644 --- a/net/batman-adv/bat_iv_ogm.c +++ b/net/batman-adv/bat_iv_ogm.c @@ -789,6 +789,10 @@ static void batadv_iv_ogm_schedule_buff(struct batadv_hard_iface *hard_iface) lockdep_assert_held(&hard_iface->bat_iv.ogm_buff_mutex); + /* interface already disabled by batadv_iv_ogm_iface_disable */ + if (!*ogm_buff) + return; + /* the interface gets activated here to avoid race conditions between * the moment of activating the interface in * hardif_activate_interface() where the originator mac is set and -- 2.20.1

1 0

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B.A.T.M.A.N March 2020