kobject_add_internal failed for firmware (error: -2 parent: 1-1:0.183) firmware xc3028-v27.fw: fw_load_sysfs_fallback: device_register failed ================================================================== BUG: KASAN: use-after-free in load_firmware_cb+0xbc/0x14f4 drivers/media/tuners/xc2028.c:1372 Read of size 8 at addr ffff0000cd077318 by task kworker/1:7/4855 CPU: 1 PID: 4855 Comm: kworker/1:7 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 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 4855: 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] kmalloc_trace+0x7c/0x94 mm/slab_common.c:1031 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:699 [inline] tuner_probe+0xc4/0x1680 drivers/media/v4l2-core/tuner-core.c:638 i2c_device_probe+0x680/0x8f4 drivers/i2c/i2c-core-base.c:590 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x39c/0xae0 drivers/base/dd.c:639 __driver_probe_device+0x180/0x314 drivers/base/dd.c:785 driver_probe_device+0x78/0x330 drivers/base/dd.c:815 __device_attach_driver+0x290/0x4e0 drivers/base/dd.c:943 bus_for_each_drv+0x150/0x1d8 drivers/base/bus.c:429 __device_attach+0x2a8/0x3d4 drivers/base/dd.c:1015 device_initial_probe+0x24/0x34 drivers/base/dd.c:1064 bus_probe_device+0xbc/0x1c4 drivers/base/bus.c:489 device_add+0xb04/0xf94 drivers/base/core.c:3697 device_register+0x28/0x38 drivers/base/core.c:3779 i2c_new_client_device+0x87c/0xe6c drivers/i2c/i2c-core-base.c:1018 v4l2_i2c_new_subdev_board+0xb0/0x20c drivers/media/v4l2-core/v4l2-i2c.c:80 v4l2_i2c_new_subdev+0x120/0x19c drivers/media/v4l2-core/v4l2-i2c.c:135 em28xx_v4l2_init+0x6f4/0x2918 drivers/media/usb/em28xx/em28xx-video.c:2617 em28xx_init_extension+0x10c/0x1b4 drivers/media/usb/em28xx/em28xx-core.c:1116 request_module_async+0x68/0x98 drivers/media/usb/em28xx/em28xx-cards.c:3405 process_one_work+0x7f4/0x13a8 kernel/workqueue.c:2292 process_scheduled_works kernel/workqueue.c:2355 [inline] worker_thread+0xae4/0xfbc kernel/workqueue.c:2444 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850 Freed by task 4855: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_free_info+0x3c/0x60 mm/kasan/generic.c:516 ____kasan_slab_free+0x148/0x1b0 mm/kasan/common.c:236 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:244 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1729 [inline] slab_free_freelist_hook+0x16c/0x1ec mm/slub.c:1755 slab_free mm/slub.c:3687 [inline] __kmem_cache_free+0xc0/0x224 mm/slub.c:3700 kfree+0xd0/0x1ac mm/slab_common.c:988 tuner_remove+0x1d8/0x1f4 drivers/media/v4l2-core/tuner-core.c:791 i2c_device_remove+0x8c/0x1c0 drivers/i2c/i2c-core-base.c:631 device_remove drivers/base/dd.c:548 [inline] __device_release_driver drivers/base/dd.c:1260 [inline] device_release_driver_internal+0x3d4/0x6d0 drivers/base/dd.c:1286 device_release_driver+0x28/0x38 drivers/base/dd.c:1309 bus_remove_device+0x294/0x388 drivers/base/bus.c:531 device_del+0x568/0x96c drivers/base/core.c:3885 device_unregister+0x2c/0xcc drivers/base/core.c:3928 i2c_unregister_device+0x114/0x16c drivers/i2c/i2c-core-base.c:1066 v4l2_i2c_subdev_unregister+0xa8/0xbc drivers/media/v4l2-core/v4l2-i2c.c:28 v4l2_device_unregister+0x170/0x248 drivers/media/v4l2-core/v4l2-device.c:102 em28xx_v4l2_init+0x1328/0x2918 drivers/media/usb/em28xx/em28xx-video.c:2898 em28xx_init_extension+0x10c/0x1b4 drivers/media/usb/em28xx/em28xx-core.c:1116 request_module_async+0x68/0x98 drivers/media/usb/em28xx/em28xx-cards.c:3405 process_one_work+0x7f4/0x13a8 kernel/workqueue.c:2292 process_scheduled_works kernel/workqueue.c:2355 [inline] worker_thread+0xae4/0xfbc kernel/workqueue.c:2444 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 ffff0000cd077000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 792 bytes inside of 2048-byte region [ffff0000cd077000, ffff0000cd077800) The buggy address belongs to the physical page: page:00000000e393e7b0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10d070 head:00000000e393e7b0 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 dead000000000100 dead000000000122 ffff0000c0002900 raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000cd077200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000cd077280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000cd077300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000cd077380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000cd077400: 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: 1 PID: 4855 Comm: kworker/1:7 Tainted: G B syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 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 : ffff800021407940 x29: ffff800021407a90 x28: ffff00019f6f5800 x27: 0000000000000000 x26: dfff800000000000 x25: ffff700004280f3c x24: 1fffe00019a0ee63 x23: ffff8000214079e0 x22: 0000000000000000 x21: 0000000000000000 x20: 0000000000000000 x19: ffff0000cd077318 x18: ffff800011abbcc0 x17: 1fffe00033edbb7e x16: ffff800008042d60 x15: 0000000040000000 x14: 0000000000000002 x13: 0000000000ff0100 x12: 0000000000ff0100 x11: ff0080000dfc1a40 x10: 0000000000000000 x9 : ffff80000dfc1a40 x8 : 0000000000000005 x7 : 0000000000000004 x6 : ffff800008251e10 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