================================================================== BUG: KASAN: slab-use-after-free in load_firmware_cb+0xbc/0x14f4 drivers/media/tuners/xc2028.c:1372 Read of size 8 at addr ffff0000d075a318 by task kworker/1:11/7325 CPU: 1 UID: 0 PID: 7325 Comm: kworker/1:11 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 Workqueue: events request_firmware_work_func Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 print_address_description+0xa8/0x238 mm/kasan/report.c:378 print_report+0x68/0x84 mm/kasan/report.c:482 kasan_report+0xb0/0x110 mm/kasan/report.c:595 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 load_firmware_cb+0xbc/0x14f4 drivers/media/tuners/xc2028.c:1372 request_firmware_work_func+0xe8/0x19c drivers/base/firmware_loader/main.c:1161 process_one_work+0x7e8/0x155c kernel/workqueue.c:3236 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x958/0xed8 kernel/workqueue.c:3400 kthread+0x5fc/0x75c kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844 Allocated by task 7364: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_alloc_info+0x44/0x54 mm/kasan/generic.c:562 poison_kmalloc_redzone mm/kasan/common.c:388 [inline] __kasan_kmalloc+0x9c/0xb4 mm/kasan/common.c:405 kasan_kmalloc include/linux/kasan.h:260 [inline] __kmalloc_cache_noprof+0x2a4/0x3fc mm/slub.c:4396 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] i2c_new_client_device+0xd0/0xe9c drivers/i2c/i2c-core-base.c:970 v4l2_i2c_new_subdev_board+0xb0/0x224 drivers/media/v4l2-core/v4l2-i2c.c:81 v4l2_i2c_new_subdev+0x138/0x1c0 drivers/media/v4l2-core/v4l2-i2c.c:136 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:1117 request_module_async+0x68/0x98 drivers/media/usb/em28xx/em28xx-cards.c:3457 process_one_work+0x7e8/0x155c kernel/workqueue.c:3236 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x958/0xed8 kernel/workqueue.c:3400 kthread+0x5fc/0x75c kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844 Freed by task 7364: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_free_info+0x58/0x70 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:243 [inline] __kasan_slab_free+0x74/0x98 mm/kasan/common.c:275 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2417 [inline] slab_free mm/slub.c:4680 [inline] kfree+0x17c/0x474 mm/slub.c:4879 i2c_client_dev_release+0x20/0x30 drivers/i2c/i2c-core-base.c:665 device_release+0x8c/0x1ac drivers/base/core.c:-1 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x2b0/0x438 lib/kobject.c:737 put_device drivers/base/core.c:3797 [inline] device_unregister+0x3c/0xcc drivers/base/core.c:3920 i2c_unregister_device+0x1ac/0x208 drivers/i2c/i2c-core-base.c:1078 v4l2_i2c_subdev_unregister+0x68/0x78 drivers/media/v4l2-core/v4l2-i2c.c:29 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:1117 request_module_async+0x68/0x98 drivers/media/usb/em28xx/em28xx-cards.c:3457 process_one_work+0x7e8/0x155c kernel/workqueue.c:3236 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x958/0xed8 kernel/workqueue.c:3400 kthread+0x5fc/0x75c kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844 The buggy address belongs to the object at ffff0000d075a000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 792 bytes inside of freed 2048-byte region [ffff0000d075a000, ffff0000d075a800) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x110758 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000040 ffff0000c0002000 fffffdffc30b2c00 0000000000000002 raw: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000 head: 05ffc00000000040 ffff0000c0002000 fffffdffc30b2c00 0000000000000002 head: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000 head: 05ffc00000000003 fffffdffc341d601 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000d075a200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d075a280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000d075a300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000d075a380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d075a400: 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