kobject: kobject_add_internal failed for firmware (error: -2 parent: 1-1:0.0) firmware xc3028-v27.fw: fw_load_sysfs_fallback: device_register failed ================================================================== BUG: KASAN: slab-use-after-free in load_firmware_cb+0xbc/0x1638 drivers/media/tuners/xc2028.c:1372 Read of size 8 at addr ffff0000ceca5318 by task kworker/0:6/6505 CPU: 0 UID: 0 PID: 6505 Comm: kworker/0:6 Not tainted 6.11.0-rc7-syzkaller-g5f5673607153 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Workqueue: events request_firmware_work_func Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:319 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:326 __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:119 print_address_description mm/kasan/report.c:377 [inline] print_report+0x198/0x538 mm/kasan/report.c:488 kasan_report+0xd8/0x138 mm/kasan/report.c:601 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 load_firmware_cb+0xbc/0x1638 drivers/media/tuners/xc2028.c:1372 request_firmware_work_func+0x150/0x214 drivers/base/firmware_loader/main.c:1167 process_one_work+0x79c/0x15b8 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x978/0xec4 kernel/workqueue.c:3389 kthread+0x288/0x310 kernel/kthread.c:389 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 Allocated by task 6505: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:565 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __kmalloc_cache_noprof+0x244/0x374 mm/slub.c:4193 kmalloc_noprof include/linux/slab.h:681 [inline] kzalloc_noprof include/linux/slab.h:807 [inline] tuner_probe+0x108/0x1788 drivers/media/v4l2-core/tuner-core.c:636 i2c_device_probe+0x640/0x8f8 drivers/i2c/i2c-core-base.c:587 really_probe+0x38c/0x8fc drivers/base/dd.c:657 __driver_probe_device+0x194/0x374 drivers/base/dd.c:799 driver_probe_device+0x78/0x330 drivers/base/dd.c:829 __device_attach_driver+0x2a8/0x4f4 drivers/base/dd.c:957 bus_for_each_drv+0x228/0x2bc drivers/base/bus.c:457 __device_attach+0x2b4/0x434 drivers/base/dd.c:1029 device_initial_probe+0x24/0x34 drivers/base/dd.c:1078 bus_probe_device+0x178/0x240 drivers/base/bus.c:532 device_add+0x728/0xa6c drivers/base/core.c:3682 device_register+0x28/0x38 drivers/base/core.c:3764 i2c_new_client_device+0x7d8/0xc3c drivers/i2c/i2c-core-base.c:989 v4l2_i2c_new_subdev_board+0xb0/0x224 drivers/media/v4l2-core/v4l2-i2c.c:80 v4l2_i2c_new_subdev+0xe4/0x150 drivers/media/v4l2-core/v4l2-i2c.c:135 em28xx_v4l2_init+0x6c8/0x28d4 drivers/media/usb/em28xx/em28xx-video.c:2619 em28xx_init_extension+0x10c/0x1b4 drivers/media/usb/em28xx/em28xx-core.c:1117 request_module_async+0x68/0x98 drivers/media/usb/em28xx/em28xx-cards.c:3457 process_one_work+0x79c/0x15b8 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x978/0xec4 kernel/workqueue.c:3389 kthread+0x288/0x310 kernel/kthread.c:389 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 Freed by task 6505: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_free_info+0x54/0x6c mm/kasan/generic.c:579 poison_slab_object+0x128/0x180 mm/kasan/common.c:240 __kasan_slab_free+0x3c/0x70 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2256 [inline] slab_free mm/slub.c:4477 [inline] kfree+0x154/0x3e0 mm/slub.c:4598 tuner_remove+0x1d8/0x1f4 drivers/media/v4l2-core/tuner-core.c:789 i2c_device_remove+0x8c/0x1c0 drivers/i2c/i2c-core-base.c:627 device_remove drivers/base/dd.c:566 [inline] __device_release_driver drivers/base/dd.c:1272 [inline] device_release_driver_internal+0x3e4/0x698 drivers/base/dd.c:1295 device_release_driver+0x28/0x38 drivers/base/dd.c:1318 bus_remove_device+0x314/0x3b4 drivers/base/bus.c:574 device_del+0x480/0x828 drivers/base/core.c:3871 device_unregister+0x2c/0xcc drivers/base/core.c:3912 i2c_unregister_device+0x130/0x190 drivers/i2c/i2c-core-base.c:1034 v4l2_i2c_subdev_unregister+0xa8/0xbc drivers/media/v4l2-core/v4l2-i2c.c:28 v4l2_device_unregister+0x17c/0x248 drivers/media/v4l2-core/v4l2-device.c:102 em28xx_v4l2_init+0x1300/0x28d4 drivers/media/usb/em28xx/em28xx-video.c:2900 em28xx_init_extension+0x10c/0x1b4 drivers/media/usb/em28xx/em28xx-core.c:1117 request_module_async+0x68/0x98 drivers/media/usb/em28xx/em28xx-cards.c:3457 process_one_work+0x79c/0x15b8 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x978/0xec4 kernel/workqueue.c:3389 kthread+0x288/0x310 kernel/kthread.c:389 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 The buggy address belongs to the object at ffff0000ceca5000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 792 bytes inside of freed 2048-byte region [ffff0000ceca5000, ffff0000ceca5800) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10eca0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 05ffc00000000040 ffff0000c0002000 0000000000000000 dead000000000001 raw: 0000000000000000 0000000080080008 00000001fdffffff 0000000000000000 head: 05ffc00000000040 ffff0000c0002000 0000000000000000 dead000000000001 head: 0000000000000000 0000000080080008 00000001fdffffff 0000000000000000 head: 05ffc00000000003 fffffdffc33b2801 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000ceca5200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000ceca5280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000ceca5300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000ceca5380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000ceca5400: 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 = 0x0000000096000005 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x05: level 1 translation fault Data abort info: ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [dfff800000000005] address between user and kernel address ranges Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP Modules linked in: CPU: 0 UID: 0 PID: 6505 Comm: kworker/0:6 Tainted: G B 6.11.0-rc7-syzkaller-g5f5673607153 #0 Tainted: [B]=BAD_PAGE Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Workqueue: events request_firmware_work_func pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : load_firmware_cb+0x1a8/0x1638 drivers/media/tuners/xc2028.c:1376 lr : load_firmware_cb+0xdc/0x1638 drivers/media/tuners/xc2028.c:1374 sp : ffff8000a35d7880 x29: ffff8000a35d79e0 x28: 0000000000000000 x27: ffff7000146baf28 x26: 0000000000000000 x25: 1ffff000146baf4c x24: 1fffe00019d94a63 x23: ffff8000a35d7940 x22: dfff800000000000 x21: ffff0000e01d9660 x20: dfff800000000000 x19: ffff0000ceca5318 x18: 1fffe000366d31ee x17: ffff80008f56d000 x16: ffff80008b339a14 x15: 0000000000000001 x14: 1ffff00012543a94 x13: 0000000000000000 x12: 0000000000000000 x11: ffff700012543a95 x10: 0000000000ff0100 x9 : 0000000000000000 x8 : 0000000000000005 x7 : 1fffe000366d31ef x6 : ffff8000802b7e24 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff8000801dfd40 x2 : 0000000000000001 x1 : 0000000000000000 x0 : 0000000000000028 Call trace: load_firmware_cb+0x1a8/0x1638 drivers/media/tuners/xc2028.c:1376 request_firmware_work_func+0x150/0x214 drivers/base/firmware_loader/main.c:1167 process_one_work+0x79c/0x15b8 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x978/0xec4 kernel/workqueue.c:3389 kthread+0x288/0x310 kernel/kthread.c:389 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 Code: 9100a380 d2d00016 d343fc08 f2fbfff6 (38746908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 9100a380 add x0, x28, #0x28 4: d2d00016 mov x22, #0x800000000000 // #140737488355328 8: d343fc08 lsr x8, x0, #3 c: f2fbfff6 movk x22, #0xdfff, lsl #48 * 10: 38746908 ldrb w8, [x8, x20] <-- trapping instruction