audit: type=1804 audit(1674690533.450:167): pid=21609 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.3" name="/root/syzkaller-testdir4178837161/syzkaller.ZjcYKn/574/file0/bus" dev="loop3" ino=41 res=1 XFS (loop3): Unmounting Filesystem ================================================================== BUG: KASAN: use-after-free in __tasklet_schedule_common+0x276/0x2c0 kernel/softirq.c:480 Write of size 8 at addr ffff8880987bb790 by task syz-executor.5/8133 CPU: 0 PID: 8133 Comm: syz-executor.5 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354 kasan_report mm/kasan/report.c:412 [inline] __asan_report_store8_noabort+0x88/0x90 mm/kasan/report.c:438 __tasklet_schedule_common+0x276/0x2c0 kernel/softirq.c:480 tasklet_schedule include/linux/interrupt.h:591 [inline] ieee80211_rx_irqsafe+0xb1/0xd0 net/mac80211/rx.c:4692 mac80211_hwsim_tx_frame_no_nl.isra.0+0xcaf/0x1330 drivers/net/wireless/mac80211_hwsim.c:1369 mac80211_hwsim_tx_frame+0x12b/0x210 drivers/net/wireless/mac80211_hwsim.c:1556 mac80211_hwsim_beacon_tx+0x3f8/0x680 drivers/net/wireless/mac80211_hwsim.c:1595 __iterate_interfaces+0x2e1/0x4a0 net/mac80211/util.c:614 ieee80211_iterate_active_interfaces_atomic+0x8d/0x170 net/mac80211/util.c:650 mac80211_hwsim_beacon+0xc9/0x190 drivers/net/wireless/mac80211_hwsim.c:1615 __tasklet_hrtimer_trampoline+0x29/0xa0 kernel/softirq.c:601 tasklet_action_common.constprop.0+0x265/0x360 kernel/softirq.c:522 __do_softirq+0x265/0x980 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x215/0x260 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1098 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:qlink_free mm/kasan/quarantine.c:150 [inline] RIP: 0010:qlist_free_all+0xfc/0x140 mm/kasan/quarantine.c:166 Code: 50 08 48 8d 4a ff 83 e2 01 48 0f 45 c1 4c 8b 70 18 e9 40 ff ff ff e8 a3 36 cf ff 48 83 3d e3 0f 59 08 00 74 38 4c 89 ff 57 9d <0f> 1f 44 00 00 4d 85 e4 75 9e 49 c7 45 08 00 00 00 00 49 c7 45 00 RSP: 0018:ffff8880a331f8c8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: ffff888050d3b5c0 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff8880a3102b48 RDI: 0000000000000286 RBP: 0000000000000000 R08: ffffed1008f20800 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888050d46000 R13: ffff8880a331f900 R14: ffff88813bff0940 R15: 0000000000000286 quarantine_reduce+0x1a9/0x230 mm/kasan/quarantine.c:259 kasan_kmalloc+0xa2/0x160 mm/kasan/kasan.c:538 slab_post_alloc_hook mm/slab.h:445 [inline] slab_alloc mm/slab.c:3397 [inline] kmem_cache_alloc+0x110/0x370 mm/slab.c:3557 kmem_cache_zalloc include/linux/slab.h:699 [inline] __delayacct_tsk_init+0x1b/0x80 kernel/delayacct.c:45 delayacct_tsk_init include/linux/delayacct.h:105 [inline] copy_process.part.0+0x3635/0x8260 kernel/fork.c:1799 copy_process kernel/fork.c:1710 [inline] _do_fork+0x22f/0xf30 kernel/fork.c:2219 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f0c32f5fdfb Code: ed 0f 85 60 01 00 00 64 4c 8b 0c 25 10 00 00 00 45 31 c0 4d 8d 91 d0 02 00 00 31 d2 31 f6 bf 11 00 20 01 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 89 00 00 00 41 89 c5 85 c0 0f 85 90 00 00 RSP: 002b:00007fff058386d0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0c32f5fdfb RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000555556f67400 R10: 0000555556f676d0 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000001 R15: 00007fff058387b0 Allocated by task 21559: kmem_cache_alloc_trace+0x12f/0x380 mm/slab.c:3625 kmalloc include/linux/slab.h:515 [inline] kzalloc include/linux/slab.h:709 [inline] bcm_tx_setup net/can/bcm.c:947 [inline] bcm_sendmsg+0x25d7/0x4150 net/can/bcm.c:1386 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:661 ___sys_sendmsg+0x7bb/0x8e0 net/socket.c:2227 __sys_sendmsg net/socket.c:2265 [inline] __do_sys_sendmsg net/socket.c:2274 [inline] __se_sys_sendmsg net/socket.c:2272 [inline] __x64_sys_sendmsg+0x132/0x220 net/socket.c:2272 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 21598: __cache_free mm/slab.c:3503 [inline] kfree+0xcc/0x210 mm/slab.c:3822 bcm_release+0x260/0x950 net/can/bcm.c:1561 __sock_release+0xcd/0x2a0 net/socket.c:599 sock_close+0x15/0x20 net/socket.c:1214 __fput+0x2ce/0x890 fs/file_table.c:278 task_work_run+0x148/0x1c0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xbf3/0x2be0 kernel/exit.c:870 do_group_exit+0x125/0x310 kernel/exit.c:967 get_signal+0x3f2/0x1f70 kernel/signal.c:2589 do_signal+0x8f/0x1670 arch/x86/kernel/signal.c:799 exit_to_usermode_loop+0x204/0x2a0 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath+0x3f0/0x4a0 arch/x86/entry/common.c:271 ret_from_fork+0x15/0x30 arch/x86/entry/entry_64.S:407 The buggy address belongs to the object at ffff8880987bb6c0 which belongs to the cache kmalloc-1024 of size 1024 The buggy address is located 208 bytes inside of 1024-byte region [ffff8880987bb6c0, ffff8880987bbac0) The buggy address belongs to the page: page:ffffea000261ee80 count:1 mapcount:0 mapping:ffff88813bff0ac0 index:0x0 compound_mapcount: 0 flags: 0xfff00000008100(slab|head) raw: 00fff00000008100 ffffea0002aa0688 ffffea0002b80788 ffff88813bff0ac0 raw: 0000000000000000 ffff8880987ba040 0000000100000007 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880987bb680: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff8880987bb700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880987bb780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880987bb800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880987bb880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ---------------- Code disassembly (best guess): 0: 50 push %rax 1: 08 48 8d or %cl,-0x73(%rax) 4: 4a ff 83 e2 01 48 0f rex.WX incq 0xf4801e2(%rbx) b: 45 c1 4c 8b 70 18 rex.RB rorl $0x18,0x70(%r11,%rcx,4) 11: e9 40 ff ff ff jmpq 0xffffff56 16: e8 a3 36 cf ff callq 0xffcf36be 1b: 48 83 3d e3 0f 59 08 cmpq $0x0,0x8590fe3(%rip) # 0x8591006 22: 00 23: 74 38 je 0x5d 25: 4c 89 ff mov %r15,%rdi 28: 57 push %rdi 29: 9d popfq * 2a: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) <-- trapping instruction 2f: 4d 85 e4 test %r12,%r12 32: 75 9e jne 0xffffffd2 34: 49 c7 45 08 00 00 00 movq $0x0,0x8(%r13) 3b: 00 3c: 49 rex.WB 3d: c7 .byte 0xc7 3e: 45 rex.RB