usb 6-1:0.14: 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 ffff88810ace7308 by task kworker/0:3/2631 CPU: 0 PID: 2631 Comm: kworker/0:3 Not tainted 5.11.0-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:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:230 __kasan_report mm/kasan/report.c:396 [inline] kasan_report.cold+0x79/0xd5 mm/kasan/report.c:413 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:296 Allocated by task 2631: 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:401 [inline] ____kasan_kmalloc.constprop.0+0x82/0xa0 mm/kasan/common.c:429 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:682 [inline] tuner_probe+0xa4/0x1180 drivers/media/v4l2-core/tuner-core.c:638 i2c_device_probe+0x916/0xae0 drivers/i2c/i2c-core-base.c:528 really_probe+0x291/0xe60 drivers/base/dd.c:554 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:740 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:846 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431 __device_attach+0x228/0x4a0 drivers/base/dd.c:914 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xbc4/0x1d90 drivers/base/core.c:3109 i2c_new_client_device+0x617/0xb00 drivers/i2c/i2c-core-base.c:922 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:1128 request_module_async+0x5d/0x70 drivers/media/usb/em28xx/em28xx-cards.c:3360 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:296 Freed by task 2631: 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:356 ____kasan_slab_free+0xe1/0x110 mm/kasan/common.c:362 kasan_slab_free include/linux/kasan.h:192 [inline] slab_free_hook mm/slub.c:1547 [inline] slab_free_freelist_hook+0x5d/0x150 mm/slub.c:1580 slab_free mm/slub.c:3143 [inline] kfree+0xdb/0x390 mm/slub.c:4125 tuner_remove+0x198/0x200 drivers/media/v4l2-core/tuner-core.c:791 i2c_device_remove+0x7b/0x200 drivers/i2c/i2c-core-base.c:561 __device_release_driver+0x3bd/0x6f0 drivers/base/dd.c:1156 device_release_driver_internal drivers/base/dd.c:1187 [inline] device_release_driver+0x26/0x40 drivers/base/dd.c:1210 bus_remove_device+0x2eb/0x5a0 drivers/base/bus.c:533 device_del+0x502/0xd40 drivers/base/core.c:3288 device_unregister+0x22/0xc0 drivers/base/core.c:3321 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:1128 request_module_async+0x5d/0x70 drivers/media/usb/em28xx/em28xx-cards.c:3360 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:296 Last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xc5/0xf0 mm/kasan/generic.c:344 __call_rcu kernel/rcu/tree.c:2965 [inline] call_rcu+0xb9/0x740 kernel/rcu/tree.c:3038 netlink_release+0xd33/0x1c50 net/netlink/af_netlink.c:802 __sock_release+0xcd/0x280 net/socket.c:597 sock_close+0x18/0x20 net/socket.c:1256 __fput+0x288/0x920 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:140 exit_task_work include/linux/task_work.h:30 [inline] do_exit+0xc61/0x2940 kernel/exit.c:825 do_group_exit+0x125/0x310 kernel/exit.c:922 __do_sys_exit_group kernel/exit.c:933 [inline] __se_sys_exit_group kernel/exit.c:931 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:931 do_syscall_64+0x2d/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Second to last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xc5/0xf0 mm/kasan/generic.c:344 __call_rcu kernel/rcu/tree.c:2965 [inline] call_rcu+0xb9/0x740 kernel/rcu/tree.c:3038 netlink_release+0xd33/0x1c50 net/netlink/af_netlink.c:802 __sock_release+0xcd/0x280 net/socket.c:597 sock_close+0x18/0x20 net/socket.c:1256 __fput+0x288/0x920 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:140 exit_task_work include/linux/task_work.h:30 [inline] do_exit+0xc61/0x2940 kernel/exit.c:825 do_group_exit+0x125/0x310 kernel/exit.c:922 __do_sys_exit_group kernel/exit.c:933 [inline] __se_sys_exit_group kernel/exit.c:931 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:931 do_syscall_64+0x2d/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff88810ace7000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 776 bytes inside of 2048-byte region [ffff88810ace7000, ffff88810ace7800) The buggy address belongs to the page: page:00000000f7f71b97 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88810ace4000 pfn:0x10ace0 head:00000000f7f71b97 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x200000000010200(slab|head) raw: 0200000000010200 0000000000000000 0000000100000001 ffff888100042000 raw: ffff88810ace4000 0000000080080005 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88810ace7200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88810ace7280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88810ace7300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88810ace7380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88810ace7400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================