general protection fault, probably for non-canonical address 0xdffffc0000000034: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000001a0-0x00000000000001a7] CPU: 1 PID: 27141 Comm: syz-executor.5 Not tainted 5.11.0-rc3-next-20210115-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:ieee80211_multicast_to_unicast net/mac80211/tx.c:4043 [inline] RIP: 0010:ieee80211_subif_start_xmit+0x24e/0xee0 net/mac80211/tx.c:4127 Code: 03 80 3c 02 00 0f 85 83 0c 00 00 49 8b 9f 10 17 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bb a4 01 00 00 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 58 0c 00 00 RSP: 0018:ffffc90000dc0570 EFLAGS: 00010203 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000100 RDX: 0000000000000034 RSI: ffffffff885c09dd RDI: 00000000000001a4 RBP: ffff88802f178780 R08: ffffffff8a63b140 R09: ffffffff885c094d R10: 0000000000000002 R11: 0000000000000003 R12: ffffffff8a636a20 R13: ffff88802cd98042 R14: 000000000000005a R15: ffff888026094000 FS: 00007efcedbe3700(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000015a0004 CR3: 000000002cc4e000 CR4: 00000000001526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: __netdev_start_xmit include/linux/netdevice.h:4758 [inline] netdev_start_xmit include/linux/netdevice.h:4772 [inline] xmit_one net/core/dev.c:3574 [inline] dev_hard_start_xmit+0x1eb/0x920 net/core/dev.c:3590 sch_direct_xmit+0x2e1/0xbd0 net/sched/sch_generic.c:313 qdisc_restart net/sched/sch_generic.c:376 [inline] __qdisc_run+0x4ba/0x15f0 net/sched/sch_generic.c:384 qdisc_run include/net/pkt_sched.h:136 [inline] qdisc_run include/net/pkt_sched.h:128 [inline] __dev_xmit_skb net/core/dev.c:3765 [inline] __dev_queue_xmit+0x1489/0x2dd0 net/core/dev.c:4119 neigh_hh_output include/net/neighbour.h:499 [inline] neigh_output include/net/neighbour.h:508 [inline] ip6_finish_output2+0x8db/0x16c0 net/ipv6/ip6_output.c:117 __ip6_finish_output net/ipv6/ip6_output.c:182 [inline] __ip6_finish_output+0x4c1/0xe10 net/ipv6/ip6_output.c:161 ip6_finish_output+0x35/0x200 net/ipv6/ip6_output.c:192 NF_HOOK_COND include/linux/netfilter.h:290 [inline] ip6_output+0x1db/0x520 net/ipv6/ip6_output.c:215 dst_output include/net/dst.h:441 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] NF_HOOK include/linux/netfilter.h:295 [inline] mld_sendpack+0x92a/0xdb0 net/ipv6/mcast.c:1679 mld_send_cr net/ipv6/mcast.c:1975 [inline] mld_ifc_timer_expire+0x60a/0xf10 net/ipv6/mcast.c:2474 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1431 expire_timers kernel/time/timer.c:1476 [inline] __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1745 __run_timers kernel/time/timer.c:1726 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1758 __do_softirq+0x2bc/0xa29 kernel/softirq.c:343 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:226 [inline] __irq_exit_rcu kernel/softirq.c:420 [inline] irq_exit_rcu+0x134/0x200 kernel/softirq.c:432 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1096 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628 RIP: 0010:trace_lock_acquire include/trace/events/lock.h:13 [inline] RIP: 0010:lock_acquire+0x5d2/0x720 kernel/locking/lockdep.c:5413 Code: 0f 0b 48 c7 c7 e0 96 4b 89 e8 4a 7b a2 07 65 c7 05 5f 2b a9 7e 00 00 00 00 e9 08 fc ff ff 0f 0b e9 fd fe ff ff e8 be f9 05 00 <85> c0 75 b4 e9 c7 d4 61 07 48 c7 c7 dc 1b 04 8d e8 09 1b 5d 00 e9 RSP: 0018:ffffc90001b97380 EFLAGS: 00000202 RAX: 0000000000000001 RBX: 1ffff92000372e72 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000 RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8d03ea8f R10: fffffbfff1a07d51 R11: 0000000000000001 R12: 0000000000000000 R13: ffffffff8b014708 R14: 0000000000000000 R15: 0000000000000000 do_write_seqcount_begin_nested include/linux/seqlock.h:520 [inline] do_write_seqcount_begin include/linux/seqlock.h:545 [inline] write_seqlock include/linux/seqlock.h:894 [inline] lock_mount_hash fs/mount.h:133 [inline] mntput_no_expire+0x29e/0xd40 fs/namespace.c:1151 mntput+0x67/0x90 fs/namespace.c:1211 simple_recursive_removal+0x404/0x6b0 fs/libfs.c:295 debugfs_remove fs/debugfs/inode.c:725 [inline] debugfs_remove+0x59/0x80 fs/debugfs/inode.c:719 ieee80211_debugfs_remove_netdev+0x43/0xc0 net/mac80211/debugfs_netdev.c:822 ieee80211_teardown_sdata+0x48/0x2d0 net/mac80211/iface.c:679 ieee80211_runtime_change_iftype net/mac80211/iface.c:1622 [inline] ieee80211_if_change_type+0x2b4/0x620 net/mac80211/iface.c:1656 ieee80211_change_iface+0x26/0x210 net/mac80211/cfg.c:157 rdev_change_virtual_intf net/wireless/rdev-ops.h:69 [inline] cfg80211_change_iface+0x307/0xf10 net/wireless/util.c:1067 nl80211_set_interface+0x65c/0x8d0 net/wireless/nl80211.c:3839 genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:739 genl_family_rcv_msg net/netlink/genetlink.c:783 [inline] genl_rcv_msg+0x328/0x580 net/netlink/genetlink.c:800 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494 genl_rcv+0x24/0x40 net/netlink/genetlink.c:811 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 __sys_sendto+0x21c/0x320 net/socket.c:1975 __do_sys_sendto net/socket.c:1987 [inline] __se_sys_sendto net/socket.c:1983 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:1983 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x417c97 Code: 2c 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 81 19 00 00 c3 48 83 ec 08 e8 e7 fa ff ff 48 89 04 24 49 89 ca b8 2c 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 2d fb ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007efcedbe1a80 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007efcedbe1bd0 RCX: 0000000000417c97 RDX: 0000000000000024 RSI: 00007efcedbe1c20 RDI: 0000000000000009 RBP: 0000000000000000 R08: 00007efcedbe1a90 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 00007efcedbe1c20 R15: 0000000000000009 Modules linked in: ---[ end trace d023b01a561ed37d ]--- RIP: 0010:ieee80211_multicast_to_unicast net/mac80211/tx.c:4043 [inline] RIP: 0010:ieee80211_subif_start_xmit+0x24e/0xee0 net/mac80211/tx.c:4127 Code: 03 80 3c 02 00 0f 85 83 0c 00 00 49 8b 9f 10 17 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bb a4 01 00 00 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 58 0c 00 00 RSP: 0018:ffffc90000dc0570 EFLAGS: 00010203 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000100 RDX: 0000000000000034 RSI: ffffffff885c09dd RDI: 00000000000001a4 RBP: ffff88802f178780 R08: ffffffff8a63b140 R09: ffffffff885c094d R10: 0000000000000002 R11: 0000000000000003 R12: ffffffff8a636a20 R13: ffff88802cd98042 R14: 000000000000005a R15: ffff888026094000 FS: 00007efcedbe3700(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000015a0004 CR3: 000000002cc4e000 CR4: 00000000001526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600