syzbot

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BUG: KASAN: invalid-access in __packet_get_status+0xb8/0x138 net/packet/af_packet.c:439
Read at addr f9f00000096e0000 by task syz.0.6722/23989
Pointer tag: [f9], memory tag: [f0]

CPU: 1 PID: 23989 Comm: syz.0.6722 Not tainted 6.10.0-rc7-syzkaller-00025-ga19ea421490d #0
Hardware name: linux,dummy-virt (DT)
Call trace:
 dump_backtrace+0x94/0xec arch/arm64/kernel/stacktrace.c:317
 show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:324
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x78/0x90 lib/dump_stack.c:114
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x108/0x618 mm/kasan/report.c:488
 kasan_report+0x88/0xac mm/kasan/report.c:601
 report_tag_fault arch/arm64/mm/fault.c:331 [inline]
 do_tag_recovery arch/arm64/mm/fault.c:343 [inline]
 __do_kernel_fault+0x1a0/0x1dc arch/arm64/mm/fault.c:385
 do_bad_area arch/arm64/mm/fault.c:485 [inline]
 do_tag_check_fault+0x78/0x8c arch/arm64/mm/fault.c:750
 do_mem_abort+0x44/0x94 arch/arm64/mm/fault.c:826
 el1_abort+0x40/0x60 arch/arm64/kernel/entry-common.c:432
 el1h_64_sync_handler+0xd8/0xe4 arch/arm64/kernel/entry-common.c:492
 el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:593
 __packet_get_status+0xb8/0x138 net/packet/af_packet.c:439
 packet_lookup_frame net/packet/af_packet.c:528 [inline]
 __tpacket_has_room net/packet/af_packet.c:1259 [inline]
 __packet_rcv_has_room+0xf8/0x188 net/packet/af_packet.c:1300
 tpacket_rcv+0x158/0xbd0 net/packet/af_packet.c:2286
 dev_queue_xmit_nit+0x284/0x2c8 net/core/dev.c:2343
 xmit_one net/core/dev.c:3574 [inline]
 dev_hard_start_xmit+0x7c/0x118 net/core/dev.c:3594
 __dev_queue_xmit+0x1c0/0xea8 net/core/dev.c:4393
 dev_queue_xmit include/linux/netdevice.h:3095 [inline]
 hsr_xmit net/hsr/hsr_forward.c:389 [inline]
 hsr_forward_do net/hsr/hsr_forward.c:529 [inline]
 hsr_forward_skb+0x3ac/0x758 net/hsr/hsr_forward.c:686
 send_hsr_supervision_frame+0x12c/0x250 net/hsr/hsr_device.c:343
 hsr_announce+0x50/0xac net/hsr/hsr_device.c:399
 call_timer_fn.constprop.0+0x24/0x80 kernel/time/timer.c:1792
 expire_timers kernel/time/timer.c:1843 [inline]
 __run_timers+0x218/0x254 kernel/time/timer.c:2417
 __run_timer_base kernel/time/timer.c:2428 [inline]
 __run_timer_base kernel/time/timer.c:2421 [inline]
 run_timer_base kernel/time/timer.c:2437 [inline]
 run_timer_softirq+0x8c/0xfc kernel/time/timer.c:2447
 handle_softirqs+0x10c/0x240 kernel/softirq.c:554
 __do_softirq+0x14/0x20 kernel/softirq.c:588
 ____do_softirq+0x10/0x1c arch/arm64/kernel/irq.c:81
 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:889
 do_softirq_own_stack+0x1c/0x28 arch/arm64/kernel/irq.c:86
 invoke_softirq kernel/softirq.c:435 [inline]
 __irq_exit_rcu kernel/softirq.c:637 [inline]
 irq_exit_rcu+0xbc/0xd8 kernel/softirq.c:649
 __el1_irq arch/arm64/kernel/entry-common.c:537 [inline]
 el1_interrupt+0x38/0x64 arch/arm64/kernel/entry-common.c:551
 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:556
 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:594
 __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:26 [inline]
 arch_local_irq_enable arch/arm64/include/asm/irqflags.h:48 [inline]
 raw_spin_rq_unlock_irq kernel/sched/sched.h:1418 [inline]
 finish_lock_switch kernel/sched/core.c:5162 [inline]
 finish_task_switch.isra.0+0x74/0x248 kernel/sched/core.c:5280
 context_switch kernel/sched/core.c:5411 [inline]
 __schedule+0x324/0x888 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0x34/0x104 kernel/sched/core.c:6837
 do_nanosleep.constprop.0+0x7c/0x138 kernel/time/hrtimer.c:2030
 hrtimer_nanosleep+0xa4/0x114 kernel/time/hrtimer.c:2083
 common_nsleep+0x44/0x6c kernel/time/posix-timers.c:1350
 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1396 [inline]
 __se_sys_clock_nanosleep kernel/time/posix-timers.c:1373 [inline]
 __arm64_sys_clock_nanosleep+0xcc/0x144 kernel/time/posix-timers.c:1373
 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
 invoke_syscall+0x48/0x118 arch/arm64/kernel/syscall.c:48
 el0_svc_common.constprop.0+0x40/0xe0 arch/arm64/kernel/syscall.c:131
 do_el0_svc+0x1c/0x28 arch/arm64/kernel/syscall.c:150
 el0_svc+0x34/0xf8 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x19c/0x1a0 arch/arm64/kernel/entry.S:598

The buggy address belongs to the physical page:
page: refcount:9 mapcount:1 mapping:0000000000000000 index:0xfaf00000096e6000 pfn:0x496e0
head: order:3 mapcount:8 entire_mapcount:0 nr_pages_mapped:8 pincount:0
flags: 0x1ffc18003000040(head|arch_2|arch_3|node=0|zone=0|lastcpupid=0x7ff|kasantag=0x6)
raw: 01ffc18003000040 0000000000000000 dead000000000122 0000000000000000
raw: faf00000096e6000 0000000000000000 0000000900000000 0000000000000000
head: 01ffc18003000040 0000000000000000 dead000000000122 0000000000000000
head: faf00000096e6000 0000000000000000 0000000900000000 0000000000000000
head: 01ffc18003000003 ffffc1ffc025b801 ffffffff00000007 0000000000000008
head: f2f0000000000008 0000000000000000 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 fff00000096dfe00: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
 fff00000096dff00: f8 f8 f8 f8 fe fe fe fe fe fe fe fe fe fe fe fe
>fff00000096e0000: f0 f0 f0 f0 f0 f0 f0 f0 f0 f0 f0 f0 f0 f0 f0 f0
                   ^
 fff00000096e0100: f0 f0 f0 f0 f0 f0 f0 f0 f0 f0 f0 f0 f0 f0 f0 f0
 fff00000096e0200: f0 f0 f0 f0 f0 f0 f0 f0 f0 f0 f0 f0 f0 f0 f0 f0
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