================================================================== BUG: KASAN: use-after-free in v4l2_release+0x319/0x390 drivers/media/v4l2-core/v4l2-dev.c:453 Read of size 8 at addr ffff8881d45d81e0 by task v4l_id/10464 CPU: 1 PID: 10464 Comm: v4l_id Not tainted 5.2.0-rc1+ #10 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0xca/0x13e lib/dump_stack.c:113 print_address_description+0x67/0x231 mm/kasan/report.c:188 __kasan_report.cold+0x1a/0x32 mm/kasan/report.c:317 kasan_report+0xe/0x20 mm/kasan/common.c:614 v4l2_release+0x319/0x390 drivers/media/v4l2-core/v4l2-dev.c:453 __fput+0x2d7/0x790 fs/file_table.c:279 task_work_run+0x13f/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x1c5/0x1f0 arch/x86/entry/common.c:168 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:279 [inline] do_syscall_64+0x43f/0x560 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f5ab7cc22b0 Code: 40 75 0b 31 c0 48 83 c4 08 e9 0c ff ff ff 48 8d 3d c5 32 08 00 e8 c0 07 02 00 83 3d 45 a3 2b 00 00 75 10 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 ce 8a 01 00 48 89 04 24 RSP: 002b:00007ffdf0858ba8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007f5ab7cc22b0 RDX: 00007f5ab7f78df0 RSI: 0000000000000001 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007f5ab7f78df0 R09: 000000000000000a R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000400884 R13: 00007ffdf0858d00 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 2690: save_stack+0x1b/0x80 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_kmalloc mm/kasan/common.c:489 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:462 slab_post_alloc_hook mm/slab.h:437 [inline] slab_alloc_node mm/slub.c:2748 [inline] __kmalloc_node_track_caller+0xee/0x370 mm/slub.c:4363 alloc_dr drivers/base/devres.c:103 [inline] devm_kmalloc+0x87/0x190 drivers/base/devres.c:793 devm_kzalloc include/linux/device.h:679 [inline] usb_raremono_probe+0x2f/0x231 drivers/media/radio/radio-raremono.c:298 usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361 really_probe+0x281/0x660 drivers/base/dd.c:509 driver_probe_device+0x104/0x210 drivers/base/dd.c:670 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:777 bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454 __device_attach+0x217/0x360 drivers/base/dd.c:843 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514 device_add+0xae6/0x16f0 drivers/base/core.c:2111 usb_set_configuration+0xdf6/0x1670 drivers/usb/core/message.c:2023 generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210 usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266 really_probe+0x281/0x660 drivers/base/dd.c:509 driver_probe_device+0x104/0x210 drivers/base/dd.c:670 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:777 bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454 __device_attach+0x217/0x360 drivers/base/dd.c:843 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514 device_add+0xae6/0x16f0 drivers/base/core.c:2111 usb_new_device.cold+0x8c1/0x1016 drivers/usb/core/hub.c:2534 hub_port_connect drivers/usb/core/hub.c:5089 [inline] hub_port_connect_change drivers/usb/core/hub.c:5204 [inline] port_event drivers/usb/core/hub.c:5350 [inline] hub_event+0x1ada/0x3590 drivers/usb/core/hub.c:5432 process_one_work+0x905/0x1570 kernel/workqueue.c:2268 process_scheduled_works kernel/workqueue.c:2330 [inline] worker_thread+0x7ab/0xe20 kernel/workqueue.c:2416 kthread+0x30b/0x410 kernel/kthread.c:254 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Freed by task 2690: save_stack+0x1b/0x80 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_slab_free+0x130/0x180 mm/kasan/common.c:451 slab_free_hook mm/slub.c:1421 [inline] slab_free_freelist_hook mm/slub.c:1448 [inline] slab_free mm/slub.c:2994 [inline] kfree+0xd7/0x280 mm/slub.c:3949 release_nodes+0x4a1/0x910 drivers/base/devres.c:508 devres_release_all+0x74/0xc3 drivers/base/devres.c:529 __device_release_driver drivers/base/dd.c:1085 [inline] device_release_driver_internal+0x21b/0x4c0 drivers/base/dd.c:1112 bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:556 device_del+0x460/0xb80 drivers/base/core.c:2274 usb_disable_device+0x211/0x690 drivers/usb/core/message.c:1237 usb_disconnect+0x284/0x830 drivers/usb/core/hub.c:2197 hub_port_connect drivers/usb/core/hub.c:4940 [inline] hub_port_connect_change drivers/usb/core/hub.c:5204 [inline] port_event drivers/usb/core/hub.c:5350 [inline] hub_event+0x1409/0x3590 drivers/usb/core/hub.c:5432 process_one_work+0x905/0x1570 kernel/workqueue.c:2268 process_scheduled_works kernel/workqueue.c:2330 [inline] worker_thread+0x7ab/0xe20 kernel/workqueue.c:2416 kthread+0x30b/0x410 kernel/kthread.c:254 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 The buggy address belongs to the object at ffff8881d45d8000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 480 bytes inside of 4096-byte region [ffff8881d45d8000, ffff8881d45d9000) The buggy address belongs to the page: page:ffffea0007517600 refcount:1 mapcount:0 mapping:ffff8881dac02600 index:0xffff8881d45de600 compound_mapcount: 0 flags: 0x200000000010200(slab|head) raw: 0200000000010200 ffffea0007214808 ffffea0007173e08 ffff8881dac02600 raw: ffff8881d45de600 0000000000070006 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881d45d8080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881d45d8100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881d45d8180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881d45d8200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881d45d8280: fb 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