program: r0 = bpf$BPF_PROG_RAW_TRACEPOINT_LOAD(0x5, &(0x7f0000000180)={0x11, 0x5, &(0x7f0000000280)=ANY=[@ANYBLOB="1801000021000000000000004cc311ec8500000075000000a70000000800000095"], &(0x7f0000000100)='GPL\x00', 0x0, 0x0, 0x0, 0x0, 0x0, '\x00', 0x0, 0x2}, 0x90) bpf$BPF_RAW_TRACEPOINT_OPEN(0x11, &(0x7f0000000540)={&(0x7f0000000080)='kfree\x00', r0, 0x0, 0xffffffffffffffff}, 0x18) r1 = bpf$MAP_CREATE_CONST_STR(0x0, &(0x7f0000000340)=ANY=[@ANYBLOB="02000000040000000800000001"], 0xe) bpf$PROG_LOAD(0x5, &(0x7f00000004c0)={0x1, 0x10, &(0x7f0000000000)=@framed={{0x18, 0x0, 0x0, 0x0, 0x400}, [@snprintf={{0x7, 0x0, 0xb, 0x8, 0x0, 0x0, 0x2}, {0x3, 0x3, 0x3, 0xa, 0x8, 0xfe00}, {0x7, 0x0, 0x8}, {}, {0x5}, {0x7, 0x0, 0x0, 0x0}, {}, {}, {}, {0x18, 0x3, 0x2, 0x0, r1}, {0x7, 0x0, 0xb, 0x4}, {0x85, 0x0, 0x0, 0x1a}}]}, &(0x7f0000000ac0)='syzkaller\x00', 0xf, 0x0, 0x0, 0x41100, 0x4, '\x00', 0x0, @fallback=0x2d, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x94) r2 = openat$uinput(0xffffffffffffff9c, &(0x7f0000000380), 0x802, 0x0) ioctl$UI_DEV_SETUP(r2, 0x405c5503, &(0x7f00000001c0)={{}, 'syz1\x00'}) ioctl$UI_DEV_SETUP(r2, 0x5501, 0x0) ioctl$UI_SET_PHYS(r2, 0x4008556c, 0x0) sendmsg$nl_route(0xffffffffffffffff, 0x0, 0x0) [ 108.962823][ T5306] Bluetooth: hci0: command tx timeout [ 109.081632][ T5325] input: syz1 as /devices/virtual/input/input5 [ 109.287761][ T5137] ================================================================== [ 109.291871][ T5137] BUG: KASAN: slab-use-after-free in bpf_trace_run2+0x2c4/0x840 [ 109.295397][ T5137] Read of size 8 at addr ffff88801cfe5880 by task dhcpcd/5137 [ 109.298556][ T5137] [ 109.299660][ T5137] CPU: 0 UID: 101 PID: 5137 Comm: dhcpcd Not tainted syzkaller #0 PREEMPT(full) [ 109.299677][ T5137] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 109.299685][ T5137] Call Trace: [ 109.299695][ T5137] [ 109.299701][ T5137] dump_stack_lvl+0xe8/0x150 [ 109.299744][ T5137] print_report+0xba/0x230 [ 109.299775][ T5137] ? bpf_trace_run2+0x2c4/0x840 [ 109.299798][ T5137] kasan_report+0x117/0x150 [ 109.299826][ T5137] ? bpf_trace_run2+0x2c4/0x840 [ 109.299844][ T5137] bpf_trace_run2+0x2c4/0x840 [ 109.299861][ T5137] ? __queue_work+0x1a1/0x1020 [ 109.299893][ T5137] ? bpf_trace_run2+0x1c9/0x840 [ 109.299909][ T5137] ? __pfx_bpf_trace_run2+0x10/0x10 [ 109.299925][ T5137] ? seccomp_filter_release+0x22b/0x2d0 [ 109.299957][ T5137] ? seccomp_filter_release+0x22b/0x2d0 [ 109.299968][ T5137] ? seccomp_filter_release+0x22b/0x2d0 [ 109.299980][ T5137] kfree+0x5b2/0x630 [ 109.300007][ T5137] ? queue_work_on+0x159/0x1d0 [ 109.300025][ T5137] seccomp_filter_release+0x22b/0x2d0 [ 109.300038][ T5137] do_exit+0x3b0/0x23c0 [ 109.300067][ T5137] ? __pfx_do_exit+0x10/0x10 [ 109.300078][ T5137] ? do_raw_spin_lock+0x12b/0x2f0 [ 109.300109][ T5137] ? do_raw_spin_lock+0x12b/0x2f0 [ 109.300121][ T5137] do_group_exit+0x21b/0x2d0 [ 109.300132][ T5137] ? _raw_spin_unlock_irq+0x23/0x50 [ 109.300180][ T5137] get_signal+0x1284/0x1330 [ 109.300201][ T5137] arch_do_signal_or_restart+0xbc/0x830 [ 109.300233][ T5137] ? __pfx_arch_do_signal_or_restart+0x10/0x10 [ 109.300252][ T5137] exit_to_user_mode_loop+0x86/0x480 [ 109.300285][ T5137] ? rcu_is_watching+0x15/0xb0 [ 109.300306][ T5137] do_syscall_64+0x32d/0xf80 [ 109.300322][ T5137] ? trace_irq_disable+0x3b/0x150 [ 109.300335][ T5137] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 109.300347][ T5137] ? clear_bhb_loop+0x40/0x90 [ 109.300361][ T5137] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 109.300376][ T5137] RIP: 0033:0x7f7917cf6407 [ 109.300398][ T5137] Code: Unable to access opcode bytes at 0x7f7917cf63dd. [ 109.300406][ T5137] RSP: 002b:00007fff9c88d9b0 EFLAGS: 00000202 ORIG_RAX: 000000000000010f [ 109.300420][ T5137] RAX: 0000000000000001 RBX: 00007f7917c6c780 RCX: 00007f7917cf6407 [ 109.300429][ T5137] RDX: 0000000000000000 RSI: 0000000000000002 RDI: 000055b1f7216380 [ 109.300439][ T5137] RBP: 00007fff9c88dcf0 R08: 0000000000000008 R09: 0000000000000000 [ 109.300446][ T5137] R10: 00007fff9c88dcf0 R11: 0000000000000202 R12: 000055b1baf075e0 [ 109.300454][ T5137] R13: 000055b1f7209d40 R14: 0000000000000000 R15: 00007fff9c88daa0 [ 109.300468][ T5137] [ 109.300474][ T5137] [ 109.416851][ T5137] Allocated by task 5325: [ 109.418845][ T5137] kasan_save_track+0x3e/0x80 [ 109.421319][ T5137] __kasan_kmalloc+0x93/0xb0 [ 109.423945][ T5137] __kmalloc_cache_noprof+0x31c/0x660 [ 109.426378][ T5137] bpf_raw_tp_link_attach+0x278/0x700 [ 109.428743][ T5137] bpf_raw_tracepoint_open+0x1b2/0x220 [ 109.431147][ T5137] __sys_bpf+0x846/0x950 [ 109.433046][ T5137] __x64_sys_bpf+0x7c/0x90 [ 109.435078][ T5137] do_syscall_64+0x14d/0xf80 [ 109.437622][ T5137] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 109.441389][ T5137] [ 109.442930][ T5137] Freed by task 37: [ 109.444824][ T5137] kasan_save_track+0x3e/0x80 [ 109.446949][ T5137] kasan_save_free_info+0x46/0x50 [ 109.449243][ T5137] __kasan_slab_free+0x5c/0x80 [ 109.451296][ T5137] kfree+0x1c1/0x630 [ 109.452962][ T5137] rcu_core+0x7cd/0x1070 [ 109.454847][ T5137] handle_softirqs+0x22a/0x870 [ 109.457132][ T5137] do_softirq+0x76/0xd0 [ 109.459333][ T5137] __local_bh_enable_ip+0xf8/0x130 [ 109.462014][ T5137] __alloc_skb+0x1aa/0x7d0 [ 109.464309][ T5137] nsim_dev_trap_report_work+0x29a/0xb80 [ 109.466824][ T5137] process_scheduled_works+0xb6e/0x18c0 [ 109.469096][ T5137] worker_thread+0xa53/0xfc0 [ 109.471048][ T5137] kthread+0x388/0x470 [ 109.472758][ T5137] ret_from_fork+0x51e/0xb90 [ 109.475086][ T5137] ret_from_fork_asm+0x1a/0x30 [ 109.477913][ T5137] [ 109.479450][ T5137] Last potentially related work creation: [ 109.482646][ T5137] kasan_save_stack+0x3e/0x60 [ 109.484710][ T5137] kasan_record_aux_stack+0xbd/0xd0 [ 109.486968][ T5137] call_rcu+0xee/0x890 [ 109.488809][ T5137] bpf_link_release+0x6b/0x80 [ 109.490968][ T5137] __fput+0x44f/0xa70 [ 109.492913][ T5137] task_work_run+0x1d9/0x270 [ 109.495093][ T5137] exit_to_user_mode_loop+0xed/0x480 [ 109.497470][ T5137] do_syscall_64+0x32d/0xf80 [ 109.499575][ T5137] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 109.502777][ T5137] [ 109.504358][ T5137] The buggy address belongs to the object at ffff88801cfe5800 [ 109.504358][ T5137] which belongs to the cache kmalloc-192 of size 192 [ 109.511762][ T5137] The buggy address is located 128 bytes inside of [ 109.511762][ T5137] freed 192-byte region [ffff88801cfe5800, ffff88801cfe58c0) [ 109.517787][ T5137] [ 109.518919][ T5137] The buggy address belongs to the physical page: [ 109.521798][ T5137] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1cfe5 [ 109.526254][ T5137] flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) [ 109.529827][ T5137] page_type: f5(slab) [ 109.531844][ T5137] raw: 00fff00000000000 ffff88801ac413c0 dead000000000100 dead000000000122 [ 109.535721][ T5137] raw: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000 [ 109.539707][ T5137] page dumped because: kasan: bad access detected [ 109.543244][ T5137] page_owner tracks the page as allocated [ 109.546136][ T5137] page last allocated via order 0, migratetype Unmovable, gfp_mask 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 14415889617, free_ts 13644235986 [ 109.555166][ T5137] post_alloc_hook+0x231/0x280 [ 109.557977][ T5137] get_page_from_freelist+0x24dc/0x2580 [ 109.560940][ T5137] __alloc_frozen_pages_noprof+0x18d/0x380 [ 109.563596][ T5137] allocate_slab+0x77/0x660 [ 109.565574][ T5137] refill_objects+0x331/0x3c0 [ 109.567806][ T5137] __pcs_replace_empty_main+0x2e6/0x730 [ 109.570471][ T5137] __kmalloc_cache_noprof+0x392/0x660 [ 109.572908][ T5137] call_usermodehelper_setup+0x8e/0x270 [ 109.575456][ T5137] kobject_uevent_env+0x658/0x9e0 [ 109.577771][ T5137] driver_register+0x2d4/0x320 [ 109.580019][ T5137] usb_register_driver+0x1e4/0x390 [ 109.582308][ T5137] do_one_initcall+0x250/0x8d0 [ 109.584563][ T5137] do_initcall_level+0x104/0x190 [ 109.586828][ T5137] do_initcalls+0x59/0xa0 [ 109.589139][ T5137] kernel_init_freeable+0x2a6/0x3e0 [ 109.591589][ T5137] kernel_init+0x1d/0x1d0 [ 109.593627][ T5137] page last free pid 1 tgid 1 stack trace: [ 109.596401][ T5137] __free_frozen_pages+0xc2b/0xdb0 [ 109.598755][ T5137] __slab_free+0x263/0x2b0 [ 109.600908][ T5137] qlist_free_all+0x97/0x100 [ 109.602941][ T5137] kasan_quarantine_reduce+0x148/0x160 [ 109.605643][ T5137] __kasan_slab_alloc+0x22/0x80 [ 109.607982][ T5137] __kmalloc_noprof+0x316/0x760 [ 109.610216][ T5137] fb_show_logo+0xf0e/0x1c10 [ 109.612328][ T5137] fbcon_switch+0x15e5/0x2040 [ 109.614425][ T5137] redraw_screen+0x586/0xec0 [ 109.617147][ T5137] set_con2fb_map+0xabb/0xfc0 [ 109.620071][ T5137] fbcon_fb_registered+0x24e/0x610 [ 109.622508][ T5137] register_framebuffer+0x738/0x8d0 [ 109.624866][ T5137] __drm_fb_helper_initial_config_and_unlock+0x14f1/0x1b90 [ 109.628069][ T5137] drm_fbdev_client_hotplug+0x16c/0x230 [ 109.630676][ T5137] drm_client_register+0x172/0x210 [ 109.633359][ T5137] drm_fbdev_client_setup+0x1a0/0x3f0 [ 109.636471][ T5137] [ 109.637910][ T5137] Memory state around the buggy address: [ 109.640527][ T5137] ffff88801cfe5780: 00 00 00 00 00 00 00 06 fc fc fc fc fc fc fc fc [ 109.643983][ T5137] ffff88801cfe5800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 109.647481][ T5137] >ffff88801cfe5880: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 109.652377][ T5137] ^ [ 109.654771][ T5137] ffff88801cfe5900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 109.658500][ T5137] ffff88801cfe5980: 04 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 109.662243][ T5137] ==================================================================