program: r0 = bpf$MAP_CREATE_CONST_STR(0x0, &(0x7f0000000680)=ANY=[@ANYBLOB="0200000004000000080000000100000080000000", @ANYRES32=0x0, @ANYBLOB="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", @ANYRES32=0x0, @ANYRES32, @ANYBLOB='\x00'/28], 0x48) r1 = bpf$PROG_LOAD(0x5, &(0x7f00000004c0)={0xc, 0x10, &(0x7f0000000600)=ANY=[@ANYBLOB="1805000000000000000000000000b7080000000000007b8af8ff00000000b7080000000000007b8af0ff00000000bfa100000000000007010000f8ffffffb1a400000000000007040000f0ffffffb702000008000000182300000000", @ANYRES32=r0, @ANYBLOB="0000000000000000b704000008000000850000001c0000009500000000000000"], &(0x7f0000000000)='GPL\x00', 0x0, 0x0, 0x0, 0x0, 0x0, '\x00', 0x0, @fallback, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x90) (async) r2 = syz_open_dev$media(&(0x7f00000000c0), 0x103, 0x0) (async) r3 = socket$inet6_sctp(0xa, 0x5, 0x84) setsockopt$inet_sctp6_SCTP_EVENTS(r3, 0x84, 0xb, &(0x7f0000000040)={0x0, 0x4}, 0xe) (async) shutdown(r3, 0x0) getsockopt$inet_sctp6_SCTP_SOCKOPT_CONNECTX3(r3, 0x84, 0x6f, &(0x7f0000000000)={0x0, 0x10, &(0x7f00000002c0)=[@in={0x2, 0x0, @local}]}, &(0x7f0000000440)=0x10) (async, rerun: 64) r4 = socket$inet_sctp(0x2, 0x1, 0x84) (rerun: 64) getsockopt$inet_sctp_SCTP_MAX_BURST(r4, 0x84, 0xd, &(0x7f0000000000)=@assoc_value={0x0}, &(0x7f0000000040)=0x8) setsockopt$inet_sctp6_SCTP_AUTH_KEY(r3, 0x84, 0x17, &(0x7f00000000c0)={r5, 0x6, 0x4, "29cc2721"}, 0xc) (async, rerun: 64) ioctl$MEDIA_IOC_REQUEST_ALLOC(r2, 0x80047c05, 0x0) (async, rerun: 64) r6 = seccomp$SECCOMP_SET_MODE_FILTER_LISTENER(0x1, 0x0, &(0x7f0000000400)={0x1, &(0x7f0000000380)=[{0x6, 0x0, 0x0, 0x7fffffff}]}) (async) r7 = socket$unix(0x1, 0x5, 0x0) socket$inet_mptcp(0x2, 0x1, 0x106) (async) r8 = dup2(r7, r6) close_range(r8, 0xffffffffffffffff, 0x0) bpf$BPF_PROG_TEST_RUN(0xa, &(0x7f0000000440)={r1, 0xfffff000, 0xc3, 0x0, &(0x7f0000000100)="61cf3e0b0e7ce7bac146f529f39abe35a7ec6f66c88d57290b75c9aed4a7e77de318f7e0c5a326be699cb2862b3be92c3ca61117f225acee00e602a6cc6ba098f202a44d710f3c3096cb61f1a3bd4ca8d2ecf9a1253ea8e61cee20de2b652a6e3eb49597e950680ed6d65a35f5890c8b2f188522da22e9f62108645384c458907e083a8faf58e81251918f8fbe8dc84e66c84a634cbf7888d11cf9d1f17ab383ac16f79062cd462658f4cd6d36d52fc3b881309e2d2505b1039dbf21af656706fccf66", 0x0, 0x0, 0x7000000, 0x0, 0x0, 0x0, 0x0, 0x4}, 0x50) (async) r9 = syz_open_dev$vivid(&(0x7f0000000040), 0x3, 0x2) (async) ioctl$sock_FIOGETOWN(r7, 0x8903, &(0x7f0000000200)=0x0) bpf$BPF_TASK_FD_QUERY(0x14, &(0x7f0000000280)={r10, r8, 0x0, 0x2, &(0x7f0000000240)='b\x00'}, 0x30) (async) ioctl$VIDIOC_S_FREQUENCY(r9, 0x402c5639, &(0x7f0000000080)={0x6, 0x1, 0x1000000}) [ 85.256206][ T5341] ================================================================== [ 85.259580][ T5341] BUG: KASAN: slab-use-after-free in number+0xc48/0xf60 [ 85.262705][ T5341] Write of size 1 at addr ffff888012633a0e by task syz.0.0/5341 [ 85.266134][ T5341] [ 85.267323][ T5341] CPU: 0 UID: 0 PID: 5341 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 85.267341][ T5341] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 [ 85.267349][ T5341] Call Trace: [ 85.267357][ T5341] [ 85.267363][ T5341] dump_stack_lvl+0xe8/0x150 [ 85.267382][ T5341] print_report+0xca/0x240 [ 85.267393][ T5341] ? number+0xc48/0xf60 [ 85.267404][ T5341] kasan_report+0x118/0x150 [ 85.267470][ T5341] ? number+0xc48/0xf60 [ 85.267483][ T5341] number+0xc48/0xf60 [ 85.267496][ T5341] ? number+0xc1/0xf60 [ 85.267507][ T5341] ? __pfx_number+0x10/0x10 [ 85.267518][ T5341] ? __lock_acquire+0x6b6/0x2cf0 [ 85.267529][ T5341] ? format_decode+0x5a3/0xe10 [ 85.267541][ T5341] vsnprintf+0x8e5/0xee0 [ 85.267554][ T5341] snprintf+0xda/0x120 [ 85.267567][ T5341] ? __pfx_snprintf+0x10/0x10 [ 85.267578][ T5341] ? fd_install+0x95/0x3d0 [ 85.267588][ T5341] ? fd_install+0x95/0x3d0 [ 85.267597][ T5341] ? fd_install+0x307/0x3d0 [ 85.267606][ T5341] media_request_alloc+0x319/0x5b0 [ 85.267656][ T5341] media_device_request_alloc+0x98/0xd0 [ 85.267667][ T5341] media_device_ioctl+0x278/0x430 [ 85.267683][ T5341] ? do_futex+0x333/0x420 [ 85.267694][ T5341] ? __pfx_media_device_ioctl+0x10/0x10 [ 85.267714][ T5341] ? __fget_files+0x3a0/0x420 [ 85.267723][ T5341] ? __fget_files+0x2a/0x420 [ 85.267732][ T5341] ? __pfx_media_device_ioctl+0x10/0x10 [ 85.267745][ T5341] ? media_ioctl+0xfe/0x120 [ 85.267754][ T5341] ? __pfx_media_ioctl+0x10/0x10 [ 85.267763][ T5341] __se_sys_ioctl+0xfc/0x170 [ 85.267777][ T5341] do_syscall_64+0xec/0xf80 [ 85.267787][ T5341] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 85.267797][ T5341] ? trace_irq_disable+0x37/0x100 [ 85.267809][ T5341] ? clear_bhb_loop+0x60/0xb0 [ 85.267820][ T5341] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 85.267832][ T5341] RIP: 0033:0x7fc69818f7c9 [ 85.267844][ T5341] Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 [ 85.267852][ T5341] RSP: 002b:00007fc6990ed038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 85.267864][ T5341] RAX: ffffffffffffffda RBX: 00007fc6983e5fa0 RCX: 00007fc69818f7c9 [ 85.267871][ T5341] RDX: 0000000000000000 RSI: 0000000080047c05 RDI: 0000000000000003 [ 85.267877][ T5341] RBP: 00007fc698213f91 R08: 0000000000000000 R09: 0000000000000000 [ 85.267883][ T5341] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 85.267889][ T5341] R13: 00007fc6983e6038 R14: 00007fc6983e5fa0 R15: 00007ffca3559908 [ 85.267899][ T5341] [ 85.267904][ T5341] [ 85.378890][ T5341] Allocated by task 5341: [ 85.380806][ T5341] kasan_save_track+0x3e/0x80 [ 85.382932][ T5341] __kasan_kmalloc+0x93/0xb0 [ 85.385198][ T5341] __kmalloc_cache_noprof+0x3e2/0x700 [ 85.387507][ T5341] media_request_alloc+0xe4/0x5b0 [ 85.389712][ T5341] media_device_request_alloc+0x98/0xd0 [ 85.392038][ T5341] media_device_ioctl+0x278/0x430 [ 85.394215][ T5341] __se_sys_ioctl+0xfc/0x170 [ 85.396301][ T5341] do_syscall_64+0xec/0xf80 [ 85.398251][ T5341] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 85.400768][ T5341] [ 85.401773][ T5341] Freed by task 5342: [ 85.403572][ T5341] kasan_save_track+0x3e/0x80 [ 85.405599][ T5341] kasan_save_free_info+0x46/0x50 [ 85.407852][ T5341] __kasan_slab_free+0x5c/0x80 [ 85.409969][ T5341] kfree+0x1c0/0x660 [ 85.411672][ T5341] media_request_close+0x38/0x50 [ 85.413865][ T5341] __fput+0x44c/0xa70 [ 85.415976][ T5341] task_work_run+0x1d4/0x260 [ 85.418163][ T5341] exit_to_user_mode_loop+0xef/0x4e0 [ 85.420559][ T5341] do_syscall_64+0x2b7/0xf80 [ 85.422593][ T5341] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 85.425155][ T5341] [ 85.426220][ T5341] The buggy address belongs to the object at ffff888012633a00 [ 85.426220][ T5341] which belongs to the cache kmalloc-256 of size 256 [ 85.431948][ T5341] The buggy address is located 14 bytes inside of [ 85.431948][ T5341] freed 256-byte region [ffff888012633a00, ffff888012633b00) [ 85.438789][ T5341] [ 85.440207][ T5341] The buggy address belongs to the physical page: [ 85.446603][ T5341] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12633 [ 85.450644][ T5341] flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) [ 85.453865][ T5341] page_type: f5(slab) [ 85.455745][ T5341] raw: 00fff00000000000 ffff88801a441b40 dead000000000122 0000000000000000 [ 85.459623][ T5341] raw: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000 [ 85.463106][ T5341] page dumped because: kasan: bad access detected [ 85.465952][ T5341] page_owner tracks the page as allocated [ 85.468640][ T5341] page last allocated via order 0, migratetype Unmovable, gfp_mask 0x252800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_THISNODE), pid 12, tgid 12 (kworker/u4:0), ts 85140860739, free_ts 83097091217 [ 85.476544][ T5341] post_alloc_hook+0x234/0x290 [ 85.478627][ T5341] get_page_from_freelist+0x24e0/0x2580 [ 85.480966][ T5341] __alloc_frozen_pages_noprof+0x181/0x370 [ 85.483439][ T5341] allocate_slab+0x7a/0x3b0 [ 85.485339][ T5341] ___slab_alloc+0xe53/0x1820 [ 85.487314][ T5341] __slab_alloc+0x65/0x100 [ 85.489184][ T5341] __kmalloc_node_noprof+0x5d9/0x820 [ 85.491388][ T5341] alloc_slab_obj_exts+0x3e/0x100 [ 85.493501][ T5341] allocate_slab+0x1cc/0x3b0 [ 85.495744][ T5341] ___slab_alloc+0xe53/0x1820 [ 85.497932][ T5341] __slab_alloc+0x65/0x100 [ 85.499945][ T5341] kmem_cache_alloc_noprof+0x40f/0x710 [ 85.502175][ T5341] fib6_add_1+0x9c1/0x1460 [ 85.503940][ T5341] fib6_add+0x204/0x18a0 [ 85.505837][ T5341] ip6_ins_rt+0xc8/0x120 [ 85.507624][ T5341] __ipv6_ifa_notify+0x62f/0xaa0 [ 85.509618][ T5341] page last free pid 78 tgid 78 stack trace: [ 85.512183][ T5341] free_unref_folios+0xdb3/0x14f0 [ 85.514374][ T5341] shrink_folio_list+0x28df/0x5010 [ 85.516704][ T5341] evict_folios+0x473e/0x57f0 [ 85.519009][ T5341] try_to_shrink_lruvec+0x8a3/0xb50 [ 85.521318][ T5341] shrink_one+0x25c/0x720 [ 85.523160][ T5341] shrink_node+0x2f7d/0x35b0 [ 85.525133][ T5341] kswapd+0x145a/0x2820 [ 85.526882][ T5341] kthread+0x711/0x8a0 [ 85.528593][ T5341] ret_from_fork+0x510/0xa50 [ 85.530500][ T5341] ret_from_fork_asm+0x1a/0x30 [ 85.532492][ T5341] [ 85.533650][ T5341] Memory state around the buggy address: [ 85.536132][ T5341] ffff888012633900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 85.539658][ T5341] ffff888012633980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 85.543087][ T5341] >ffff888012633a00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 85.546503][ T5341] ^ [ 85.548347][ T5341] ffff888012633a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 85.551801][ T5341] ffff888012633b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 85.555114][ T5341] ================================================================== [ 85.574926][ T5317] Bluetooth: hci0: command tx timeout [ 85.624036][ T5341] Kernel panic - not syncing: KASAN: panic_on_warn set ... [ 85.627401][ T5341] CPU: 0 UID: 0 PID: 5341 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 85.631247][ T5341] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 [ 85.635863][ T5341] Call Trace: [ 85.637367][ T5341] [ 85.638597][ T5341] vpanic+0x1e0/0x670 [ 85.640267][ T5341] panic+0xb9/0xc0 [ 85.642000][ T5341] ? __pfx_panic+0x10/0x10 [ 85.643883][ T5341] ? preempt_schedule_thunk+0x16/0x30 [ 85.646190][ T5341] ? number+0xc48/0xf60 [ 85.648059][ T5341] check_panic_on_warn+0x89/0xb0 [ 85.650269][ T5341] ? number+0xc48/0xf60 [ 85.652071][ T5341] end_report+0x6f/0x140 [ 85.653913][ T5341] kasan_report+0x129/0x150 [ 85.655988][ T5341] ? number+0xc48/0xf60 [ 85.657885][ T5341] number+0xc48/0xf60 [ 85.659600][ T5341] ? number+0xc1/0xf60 [ 85.661294][ T5341] ? __pfx_number+0x10/0x10 [ 85.663175][ T5341] ? __lock_acquire+0x6b6/0x2cf0 [ 85.665236][ T5341] ? format_decode+0x5a3/0xe10 [ 85.667215][ T5341] vsnprintf+0x8e5/0xee0 [ 85.668946][ T5341] snprintf+0xda/0x120 [ 85.670661][ T5341] ? __pfx_snprintf+0x10/0x10 [ 85.672626][ T5341] ? fd_install+0x95/0x3d0 [ 85.674651][ T5341] ? fd_install+0x95/0x3d0 [ 85.676684][ T5341] ? fd_install+0x307/0x3d0 [ 85.678628][ T5341] media_request_alloc+0x319/0x5b0 [ 85.680873][ T5341] media_device_request_alloc+0x98/0xd0 [ 85.683260][ T5341] media_device_ioctl+0x278/0x430 [ 85.685554][ T5341] ? do_futex+0x333/0x420 [ 85.687463][ T5341] ? __pfx_media_device_ioctl+0x10/0x10 [ 85.689810][ T5341] ? __fget_files+0x3a0/0x420 [ 85.691947][ T5341] ? __fget_files+0x2a/0x420 [ 85.693983][ T5341] ? __pfx_media_device_ioctl+0x10/0x10 [ 85.696500][ T5341] ? media_ioctl+0xfe/0x120 [ 85.698441][ T5341] ? __pfx_media_ioctl+0x10/0x10 [ 85.700620][ T5341] __se_sys_ioctl+0xfc/0x170 [ 85.702759][ T5341] do_syscall_64+0xec/0xf80 [ 85.704894][ T5341] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 85.707684][ T5341] ? trace_irq_disable+0x37/0x100 [ 85.709945][ T5341] ? clear_bhb_loop+0x60/0xb0 [ 85.712104][ T5341] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 85.714741][ T5341] RIP: 0033:0x7fc69818f7c9 [ 85.716720][ T5341] Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 [ 85.725244][ T5341] RSP: 002b:00007fc6990ed038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 85.728911][ T5341] RAX: ffffffffffffffda RBX: 00007fc6983e5fa0 RCX: 00007fc69818f7c9 [ 85.732348][ T5341] RDX: 0000000000000000 RSI: 0000000080047c05 RDI: 0000000000000003 [ 85.735824][ T5341] RBP: 00007fc698213f91 R08: 0000000000000000 R09: 0000000000000000 [ 85.739385][ T5341] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 85.743011][ T5341] R13: 00007fc6983e6038 R14: 00007fc6983e5fa0 R15: 00007ffca3559908 [ 85.746645][ T5341] [ 85.748422][ T5341] Kernel Offset: disabled [ 85.750359][ T5341] Rebooting in 86400 seconds..