================================================================== BUG: KASAN: use-after-free in v4l2_release+0x319/0x390 /drivers/media/v4l2-core/v4l2-dev.c:449 Read of size 8 at addr ffff8881d4fa34e0 by task v4l_id/3107 CPU: 0 PID: 3107 Comm: v4l_id Not tainted 5.2.0-rc6+ #15 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:449 __fput+0x2d7/0x790 /fs/file_table.c:280 task_work_run+0x13f/0x1c0 /kernel/task_work.c:113 tracehook_notify_resume /./include/linux/tracehook.h:185 [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: 0033:0x7f07e81492b0 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:00007fff67495988 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007f07e81492b0 RDX: 0000000000000013 RSI: 0000000080685600 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000400884 R13: 00007fff67495ae0 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 107: 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:815 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+0x6a4/0xe61 /drivers/usb/core/hub.c:2536 hub_port_connect /drivers/usb/core/hub.c:5098 [inline] hub_port_connect_change /drivers/usb/core/hub.c:5213 [inline] port_event /drivers/usb/core/hub.c:5359 [inline] hub_event+0x1abd/0x3550 /drivers/usb/core/hub.c:5441 process_one_work+0x905/0x1570 /kernel/workqueue.c:2269 worker_thread+0x96/0xe20 /kernel/workqueue.c:2415 kthread+0x30b/0x410 /kernel/kthread.c:255 ret_from_fork+0x24/0x30 /arch/x86/entry/entry_64.S:352 Freed by task 107: 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:2199 hub_port_connect /drivers/usb/core/hub.c:4949 [inline] hub_port_connect_change /drivers/usb/core/hub.c:5213 [inline] port_event /drivers/usb/core/hub.c:5359 [inline] hub_event+0x13bd/0x3550 /drivers/usb/core/hub.c:5441 process_one_work+0x905/0x1570 /kernel/workqueue.c:2269 process_scheduled_works /kernel/workqueue.c:2331 [inline] worker_thread+0x7ab/0xe20 /kernel/workqueue.c:2417 kthread+0x30b/0x410 /kernel/kthread.c:255 ret_from_fork+0x24/0x30 /arch/x86/entry/entry_64.S:352 The buggy address belongs to the object at ffff8881d4fa3300 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 480 bytes inside of 4096-byte region [ffff8881d4fa3300, ffff8881d4fa4300) The buggy address belongs to the page: page:ffffea000753e800 refcount:1 mapcount:0 mapping:ffff8881dac02600 index:0x0 compound_mapcount: 0 flags: 0x200000000010200(slab|head) raw: 0200000000010200 dead000000000100 dead000000000200 ffff8881dac02600 raw: 0000000000000000 0000000000070007 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881d4fa3380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881d4fa3400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881d4fa3480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881d4fa3500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881d4fa3580: fb fb fb fb fb 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