usb 5-1:2.163: Direct firmware load for xc3028-v27.fw failed with error -2 ================================================================== BUG: KASAN: use-after-free in load_firmware_cb+0x235/0x250 drivers/media/tuners/tuner-xc2028.c:1364 Read of size 8 at addr ffff888110b09308 by task kworker/1:4/12276 CPU: 1 PID: 12276 Comm: kworker/1:4 Not tainted 5.12.0-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:79 [inline] dump_stack+0x143/0x1db lib/dump_stack.c:120 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:233 __kasan_report mm/kasan/report.c:419 [inline] kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:436 load_firmware_cb+0x235/0x250 drivers/media/tuners/tuner-xc2028.c:1364 request_firmware_work_func+0x12c/0x230 drivers/base/firmware_loader/main.c:1079 process_one_work+0x98d/0x1580 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x38c/0x460 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Allocated by task 32: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:427 [inline] ____kasan_kmalloc mm/kasan/common.c:506 [inline] __kasan_kmalloc+0x7a/0x90 mm/kasan/common.c:515 kmalloc include/linux/slab.h:554 [inline] kzalloc include/linux/slab.h:684 [inline] tuner_probe+0xa4/0x1180 drivers/media/v4l2-core/tuner-core.c:638 i2c_device_probe+0x916/0xae0 drivers/i2c/i2c-core-base.c:529 really_probe+0x291/0xf60 drivers/base/dd.c:576 driver_probe_device+0x298/0x410 drivers/base/dd.c:763 __device_attach_driver+0x203/0x2c0 drivers/base/dd.c:870 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431 __device_attach+0x228/0x4b0 drivers/base/dd.c:938 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xbe0/0x2100 drivers/base/core.c:3319 i2c_new_client_device+0x617/0xb00 drivers/i2c/i2c-core-base.c:923 v4l2_i2c_new_subdev_board+0xaf/0x2c0 drivers/media/v4l2-core/v4l2-i2c.c:80 v4l2_i2c_new_subdev+0x102/0x170 drivers/media/v4l2-core/v4l2-i2c.c:135 em28xx_v4l2_init drivers/media/usb/em28xx/em28xx-video.c:2627 [inline] em28xx_v4l2_init.cold+0x99c/0x3265 drivers/media/usb/em28xx/em28xx-video.c:2520 em28xx_init_extension+0x12f/0x1f0 drivers/media/usb/em28xx/em28xx-core.c:1126 request_module_async+0x5d/0x70 drivers/media/usb/em28xx/em28xx-cards.c:3406 process_one_work+0x98d/0x1580 kernel/workqueue.c:2275 process_scheduled_works kernel/workqueue.c:2337 [inline] worker_thread+0x7da/0x1120 kernel/workqueue.c:2426 kthread+0x38c/0x460 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Freed by task 32: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:357 ____kasan_slab_free mm/kasan/common.c:360 [inline] ____kasan_slab_free mm/kasan/common.c:325 [inline] __kasan_slab_free+0xda/0x110 mm/kasan/common.c:367 kasan_slab_free include/linux/kasan.h:199 [inline] slab_free_hook mm/slub.c:1562 [inline] slab_free_freelist_hook+0x6b/0x160 mm/slub.c:1600 slab_free mm/slub.c:3161 [inline] kfree+0xdb/0x3b0 mm/slub.c:4213 tuner_remove+0x198/0x200 drivers/media/v4l2-core/tuner-core.c:791 i2c_device_remove+0x7b/0x200 drivers/i2c/i2c-core-base.c:562 __device_release_driver+0x3bd/0x6f0 drivers/base/dd.c:1181 device_release_driver_internal drivers/base/dd.c:1212 [inline] device_release_driver+0x26/0x40 drivers/base/dd.c:1235 bus_remove_device+0x2eb/0x5a0 drivers/base/bus.c:533 device_del+0x502/0xd40 drivers/base/core.c:3507 device_unregister+0x22/0xc0 drivers/base/core.c:3540 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+0x20d/0x2e0 drivers/media/v4l2-core/v4l2-device.c:88 em28xx_v4l2_init drivers/media/usb/em28xx/em28xx-video.c:2908 [inline] em28xx_v4l2_init.cold+0xcf7/0x3265 drivers/media/usb/em28xx/em28xx-video.c:2520 em28xx_init_extension+0x12f/0x1f0 drivers/media/usb/em28xx/em28xx-core.c:1126 request_module_async+0x5d/0x70 drivers/media/usb/em28xx/em28xx-cards.c:3406 process_one_work+0x98d/0x1580 kernel/workqueue.c:2275 process_scheduled_works kernel/workqueue.c:2337 [inline] worker_thread+0x7da/0x1120 kernel/workqueue.c:2426 kthread+0x38c/0x460 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 The buggy address belongs to the object at ffff888110b09000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 776 bytes inside of 2048-byte region [ffff888110b09000, ffff888110b09800) The buggy address belongs to the page: page:ffffea000442c200 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888110b0f000 pfn:0x110b08 head:ffffea000442c200 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x200000000010200(slab|head) raw: 0200000000010200 0000000000000000 0000000100000001 ffff888100042000 raw: ffff888110b0f000 0000000080080007 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888110b09200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888110b09280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888110b09300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888110b09380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888110b09400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================