================================================================== BUG: KASAN: use-after-free in v4l2_ioctl+0x17a/0x1a0 drivers/media/v4l2-core/v4l2-dev.c:362 Read of size 8 at addr ffff8881d14daab8 by task v4l_id/6673 CPU: 0 PID: 6673 Comm: v4l_id Not tainted 5.1.0-rc3+ #8 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:187 kasan_report.cold+0x1a/0x35 mm/kasan/report.c:317 v4l2_ioctl+0x17a/0x1a0 drivers/media/v4l2-core/v4l2-dev.c:362 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0xce8/0x12f0 fs/ioctl.c:696 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:718 do_syscall_64+0xbd/0x500 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f0389e39347 Code: 90 90 90 48 8b 05 f1 fa 2a 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 90 90 90 90 90 90 90 90 90 90 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d c1 fa 2a 00 31 d2 48 29 c2 64 RSP: 002b:00007ffca2ac2d18 EFLAGS: 00000206 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f0389e39347 RDX: 00007ffca2ac2d20 RSI: 0000000080685600 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000400884 R13: 00007ffca2ac2e70 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 23: set_track mm/kasan/common.c:87 [inline] __kasan_kmalloc mm/kasan/common.c:497 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:470 slab_post_alloc_hook mm/slab.h:437 [inline] slab_alloc_node mm/slub.c:2756 [inline] __kmalloc_node_track_caller+0xee/0x320 mm/slub.c:4372 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/0x230 drivers/media/radio/radio-raremono.c:298 usb_probe_interface+0x30d/0x7b0 drivers/usb/core/driver.c:361 really_probe+0x296/0x680 drivers/base/dd.c:509 driver_probe_device+0xf9/0x200 drivers/base/dd.c:671 __device_attach_driver+0x1c4/0x230 drivers/base/dd.c:778 bus_for_each_drv+0x15e/0x1e0 drivers/base/bus.c:454 __device_attach+0x21e/0x360 drivers/base/dd.c:844 bus_probe_device+0x1ec/0x2a0 drivers/base/bus.c:514 device_add+0xaf4/0x1700 drivers/base/core.c:2106 usb_set_configuration+0xdf2/0x1670 drivers/usb/core/message.c:2023 generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210 usb_probe_device+0xa8/0x110 drivers/usb/core/driver.c:266 really_probe+0x296/0x680 drivers/base/dd.c:509 driver_probe_device+0xf9/0x200 drivers/base/dd.c:671 __device_attach_driver+0x1c4/0x230 drivers/base/dd.c:778 bus_for_each_drv+0x15e/0x1e0 drivers/base/bus.c:454 __device_attach+0x21e/0x360 drivers/base/dd.c:844 bus_probe_device+0x1ec/0x2a0 drivers/base/bus.c:514 device_add+0xaf4/0x1700 drivers/base/core.c:2106 usb_new_device.cold+0x8b8/0x1030 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+0x1ac9/0x35a0 drivers/usb/core/hub.c:5432 process_one_work+0x90a/0x1580 kernel/workqueue.c:2269 worker_thread+0x96/0xe20 kernel/workqueue.c:2415 kthread+0x30e/0x420 kernel/kthread.c:253 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Freed by task 23: set_track mm/kasan/common.c:87 [inline] __kasan_slab_free+0x130/0x180 mm/kasan/common.c:459 slab_free_hook mm/slub.c:1429 [inline] slab_free_freelist_hook mm/slub.c:1456 [inline] slab_free mm/slub.c:3003 [inline] kfree+0xd7/0x290 mm/slub.c:3958 release_nodes+0x4a7/0x920 drivers/base/devres.c:508 devres_release_all+0x74/0xc3 drivers/base/devres.c:529 __device_release_driver drivers/base/dd.c:1086 [inline] device_release_driver_internal+0x235/0x4f0 drivers/base/dd.c:1113 bus_remove_device+0x2ee/0x4c0 drivers/base/bus.c:556 device_del+0x462/0xb90 drivers/base/core.c:2269 usb_disable_device+0x211/0x690 drivers/usb/core/message.c:1237 usb_disconnect+0x284/0x840 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+0x13f8/0x35a0 drivers/usb/core/hub.c:5432 process_one_work+0x90a/0x1580 kernel/workqueue.c:2269 process_scheduled_works kernel/workqueue.c:2331 [inline] worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417 kthread+0x30e/0x420 kernel/kthread.c:253 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 The buggy address belongs to the object at ffff8881d14daa80 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 56 bytes inside of 2048-byte region [ffff8881d14daa80, ffff8881d14db280) The buggy address belongs to the page: page:ffffea0007453600 count:1 mapcount:0 mapping:ffff8881dac02800 index:0xffff8881d14dee80 compound_mapcount: 0 flags: 0x200000000010200(slab|head) raw: 0200000000010200 ffffea0007368a00 0000000300000003 ffff8881dac02800 raw: ffff8881d14dee80 00000000800f000d 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881d14da980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881d14daa00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8881d14daa80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881d14dab00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881d14dab80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================