em28xx 1-1:0.254: V4L2 device video0 deregistered xc2028 0-0061: destroying instance em28xx 1-1:0.254: Registering input extension usb 1-1:0.254: Direct firmware load for xc3028-v27.fw failed with error -2 ================================================================== BUG: KASAN: use-after-free in load_firmware_cb+0x173/0x18c drivers/media/tuners/tuner-xc2028.c:1364 Read of size 8 at addr ffff8881cdd5c308 by task kworker/1:3/103 CPU: 1 PID: 103 Comm: kworker/1:3 Not tainted 5.6.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events request_firmware_work_func Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0xef/0x16e lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xd3/0x314 mm/kasan/report.c:374 __kasan_report.cold+0x37/0x77 mm/kasan/report.c:506 kasan_report+0xe/0x20 mm/kasan/common.c:641 load_firmware_cb+0x173/0x18c drivers/media/tuners/tuner-xc2028.c:1364 request_firmware_work_func+0x126/0x242 drivers/base/firmware_loader/main.c:976 process_one_work+0x94b/0x1620 kernel/workqueue.c:2264 worker_thread+0x96/0xe20 kernel/workqueue.c:2410 kthread+0x318/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Allocated by task 103: save_stack+0x1b/0x80 mm/kasan/common.c:72 set_track mm/kasan/common.c:80 [inline] __kasan_kmalloc mm/kasan/common.c:515 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:488 kmalloc include/linux/slab.h:555 [inline] kzalloc include/linux/slab.h:669 [inline] tuner_probe+0xa4/0x1182 drivers/media/v4l2-core/tuner-core.c:638 i2c_device_probe+0x51a/0x800 drivers/i2c/i2c-core-base.c:396 really_probe+0x290/0xac0 drivers/base/dd.c:551 driver_probe_device+0x223/0x350 drivers/base/dd.c:724 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:831 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:431 __device_attach+0x217/0x390 drivers/base/dd.c:897 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0x1459/0x1bf0 drivers/base/core.c:2500 i2c_new_client_device+0x589/0xa70 drivers/i2c/i2c-core-base.c:784 i2c_new_device+0x19/0x50 drivers/i2c/i2c-core-base.c:827 v4l2_i2c_new_subdev_board+0xaf/0x2a0 drivers/media/v4l2-core/v4l2-i2c.c:80 v4l2_i2c_new_subdev+0xb8/0xf0 drivers/media/v4l2-core/v4l2-i2c.c:135 em28xx_v4l2_init drivers/media/usb/em28xx/em28xx-video.c:2627 [inline] em28xx_v4l2_init.cold+0x9cc/0x33eb drivers/media/usb/em28xx/em28xx-video.c:2520 em28xx_init_extension+0x12f/0x1f0 drivers/media/usb/em28xx/em28xx-core.c:1128 request_module_async+0x5d/0x70 drivers/media/usb/em28xx/em28xx-cards.c:3320 process_one_work+0x94b/0x1620 kernel/workqueue.c:2264 process_scheduled_works kernel/workqueue.c:2326 [inline] worker_thread+0x73e/0xe20 kernel/workqueue.c:2415 kthread+0x318/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Freed by task 103: save_stack+0x1b/0x80 mm/kasan/common.c:72 set_track mm/kasan/common.c:80 [inline] kasan_set_free_info mm/kasan/common.c:337 [inline] __kasan_slab_free+0x117/0x160 mm/kasan/common.c:476 slab_free_hook mm/slub.c:1444 [inline] slab_free_freelist_hook mm/slub.c:1477 [inline] slab_free mm/slub.c:3024 [inline] kfree+0xd5/0x300 mm/slub.c:3976 tuner_remove+0x198/0x200 drivers/media/v4l2-core/tuner-core.c:791 i2c_device_remove+0xcf/0x250 drivers/i2c/i2c-core-base.c:426 __device_release_driver drivers/base/dd.c:1135 [inline] device_release_driver_internal+0x231/0x500 drivers/base/dd.c:1168 bus_remove_device+0x2eb/0x5a0 drivers/base/bus.c:533 device_del+0x481/0xd30 drivers/base/core.c:2677 device_unregister+0x22/0xc0 drivers/base/core.c:2709 i2c_unregister_device+0x38/0x40 include/linux/err.h:41 v4l2_i2c_subdev_unregister+0xa2/0xc0 drivers/media/v4l2-core/v4l2-i2c.c:28 v4l2_device_unregister drivers/media/v4l2-core/v4l2-device.c:102 [inline] v4l2_device_unregister+0x18a/0x220 drivers/media/v4l2-core/v4l2-device.c:88 em28xx_v4l2_init drivers/media/usb/em28xx/em28xx-video.c:2908 [inline] em28xx_v4l2_init.cold+0xd26/0x33eb drivers/media/usb/em28xx/em28xx-video.c:2520 em28xx_init_extension+0x12f/0x1f0 drivers/media/usb/em28xx/em28xx-core.c:1128 request_module_async+0x5d/0x70 drivers/media/usb/em28xx/em28xx-cards.c:3320 process_one_work+0x94b/0x1620 kernel/workqueue.c:2264 process_scheduled_works kernel/workqueue.c:2326 [inline] worker_thread+0x73e/0xe20 kernel/workqueue.c:2415 kthread+0x318/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 The buggy address belongs to the object at ffff8881cdd5c000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 776 bytes inside of 2048-byte region [ffff8881cdd5c000, ffff8881cdd5c800) The buggy address belongs to the page: page:ffffea0007375600 refcount:1 mapcount:0 mapping:ffff8881da00c000 index:0x0 compound_mapcount: 0 flags: 0x200000000010200(slab|head) raw: 0200000000010200 dead000000000100 dead000000000122 ffff8881da00c000 raw: 0000000000000000 0000000080080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881cdd5c200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881cdd5c280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881cdd5c300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881cdd5c380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881cdd5c400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================