------------[ cut here ]------------ sysfs group 'power' not found for kobject 'xc3028-v27.fw' WARNING: CPU: 0 PID: 14 at fs/sysfs/group.c:280 sysfs_remove_group+0x174/0x288 fs/sysfs/group.c:278 Modules linked in: CPU: 0 PID: 14 Comm: kworker/0:1 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 Workqueue: events request_firmware_work_func pstate: 62400005 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--) pc : sysfs_remove_group+0x174/0x288 fs/sysfs/group.c:278 lr : sysfs_remove_group+0x174/0x288 fs/sysfs/group.c:278 sp : ffff80001c8b7740 x29: ffff80001c8b7740 x28: ffff0000d2682c00 x27: dfff800000000000 x26: ffff80001c8b7800 x25: ffff0000c3c3d030 x24: 1ffff00002535cb8 x23: dfff800000000000 x22: ffff0000d65bf068 x21: ffff0000d65bf008 x20: ffff0000f3a682b8 x19: ffff8000129ae5a0 x18: ffff800011abbcc0 x17: 1fffe00033ed797e x16: ffff8000082d25ac x15: 0000000040000000 x14: 0000000000000002 x13: 1ffff00002a180b1 x12: 0000000000ff0100 x11: ff0080000a894374 x10: 0000000000000003 x9 : 8ffbdd544f383d00 x8 : 8ffbdd544f383d00 x7 : ffff800008251e80 x6 : 0000000000000000 x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000007 x1 : ffff800011abd7c0 x0 : ffff80018a6a7000 Call trace: sysfs_remove_group+0x174/0x288 fs/sysfs/group.c:278 dpm_sysfs_remove+0xa4/0xd4 drivers/base/power/sysfs.c:837 device_del+0x258/0x96c drivers/base/core.c:3862 fw_load_sysfs_fallback drivers/base/firmware_loader/fallback.c:120 [inline] fw_load_from_user_helper drivers/base/firmware_loader/fallback.c:158 [inline] firmware_fallback_sysfs+0x5a0/0x864 drivers/base/firmware_loader/fallback.c:234 _request_firmware+0xce0/0xf84 drivers/base/firmware_loader/main.c:884 request_firmware_work_func+0xa8/0x19c drivers/base/firmware_loader/main.c:1135 process_one_work+0x7f4/0x13a8 kernel/workqueue.c:2292 worker_thread+0x8c8/0xfbc kernel/workqueue.c:2439 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850 irq event stamp: 161068 hardirqs last enabled at (161067): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1367 [inline] hardirqs last enabled at (161067): [] finish_lock_switch+0xb0/0x1c4 kernel/sched/core.c:5003 hardirqs last disabled at (161068): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405 softirqs last enabled at (160704): [] local_bh_enable+0xc/0x2c include/linux/bottom_half.h:32 softirqs last disabled at (160700): [] local_bh_disable+0xc/0x2c include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]--- ================================================================== BUG: KASAN: use-after-free in load_firmware_cb+0xbc/0x14f4 drivers/media/tuners/xc2028.c:1372 Read of size 8 at addr ffff0000dae8d318 by task kworker/0:1/14 CPU: 0 PID: 14 Comm: kworker/0:1 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 Workqueue: events request_firmware_work_func Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 print_address_description+0x88/0x218 mm/kasan/report.c:316 print_report+0x50/0x68 mm/kasan/report.c:420 kasan_report+0xa8/0x100 mm/kasan/report.c:524 __asan_report_load8_noabort+0x2c/0x38 mm/kasan/report_generic.c:351 load_firmware_cb+0xbc/0x14f4 drivers/media/tuners/xc2028.c:1372 request_firmware_work_func+0xe8/0x19c drivers/base/firmware_loader/main.c:1137 process_one_work+0x7f4/0x13a8 kernel/workqueue.c:2292 worker_thread+0x8c8/0xfbc kernel/workqueue.c:2439 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850 Allocated by task 5429: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_alloc_info+0x28/0x34 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xa0/0xb8 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:936 [inline] __kmalloc_node_track_caller+0xe0/0x16c mm/slab_common.c:956 kmalloc_reserve net/core/skbuff.c:446 [inline] __alloc_skb+0x264/0x718 net/core/skbuff.c:515 alloc_skb include/linux/skbuff.h:1271 [inline] mld_newpack+0x118/0xa1c net/ipv6/mcast.c:1745 add_grhead+0x6c/0x25c net/ipv6/mcast.c:1856 add_grec+0x1144/0x1324 net/ipv6/mcast.c:1994 mld_send_cr net/ipv6/mcast.c:2120 [inline] mld_ifc_work+0x628/0xa94 net/ipv6/mcast.c:2658 process_one_work+0x7f4/0x13a8 kernel/workqueue.c:2292 worker_thread+0x8c8/0xfbc kernel/workqueue.c:2439 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850 The buggy address belongs to the object at ffff0000dae8d000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 792 bytes inside of 2048-byte region [ffff0000dae8d000, ffff0000dae8d800) The buggy address belongs to the physical page: page:0000000085431fa9 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000dae8b000 pfn:0x11ae88 head:0000000085431fa9 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 fffffc00035b6408 fffffc0003ce8a08 ffff0000c0002900 raw: ffff0000dae8b000 0000000000080002 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000dae8d200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000dae8d280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000dae8d300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000dae8d380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000dae8d400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== Unable to handle kernel paging request at virtual address dfff800000000005 KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f] Mem abort info: ESR = 0x0000000096000006 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x06: level 2 translation fault Data abort info: ISV = 0, ISS = 0x00000006 CM = 0, WnR = 0 [dfff800000000005] address between user and kernel address ranges Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 14 Comm: kworker/0:1 Tainted: G B W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 Workqueue: events request_firmware_work_func pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--) pc : load_firmware_cb+0x22c/0x14f4 drivers/media/tuners/xc2028.c:1376 lr : load_firmware_cb+0xe0/0x14f4 drivers/media/tuners/xc2028.c:1374 sp : ffff80001c8b7940 x29: ffff80001c8b7a90 x28: ffff00019f6d4800 x27: 0000000000000000 x26: dfff800000000000 x25: ffff700003916f3c x24: 1fffe0001b5d1a63 x23: ffff80001c8b79e0 x22: 0000000000000000 x21: 0000000000000000 x20: 0000000000000000 x19: ffff0000dae8d318 x18: ffff800011abbcc0 x17: 1fffe00033ed797e x16: ffff800008042d90 x15: 0000000040000000 x14: 0000000000000002 x13: 0000000000ff0100 x12: 0000000000ff0100 x11: ff0080000dfc2210 x10: 0000000000000000 x9 : ffff80000dfc2210 x8 : 0000000000000005 x7 : 0000000000000004 x6 : ffff800008251e80 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff800008191794 x2 : 0000000000000001 x1 : 0000000000000000 x0 : 0000000000000028 Call trace: load_firmware_cb+0x22c/0x14f4 drivers/media/tuners/xc2028.c:1376 request_firmware_work_func+0xe8/0x19c drivers/base/firmware_loader/main.c:1137 process_one_work+0x7f4/0x13a8 kernel/workqueue.c:2292 worker_thread+0x8c8/0xfbc kernel/workqueue.c:2439 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850 Code: b5fff65b f9403bf6 9100a2c0 d343fc08 (387a6908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: b5fff65b cbnz x27, 0xfffffffffffffec8 4: f9403bf6 ldr x22, [sp, #112] 8: 9100a2c0 add x0, x22, #0x28 c: d343fc08 lsr x8, x0, #3 * 10: 387a6908 ldrb w8, [x8, x26] <-- trapping instruction