em28xx 1-1:5.176: failed to create media graph em28xx 1-1:5.176: V4L2 device video32 deregistered em28xx 1-1:5.176: Binding DVB extension ================================================================== em28xx 1-1:5.176: no endpoint for DVB mode and transfer type 0 BUG: KASAN: use-after-free in v4l2_fh_init+0x24c/0x290 drivers/media/v4l2-core/v4l2-fh.c:33 Read of size 8 at addr ffff8880a4f149d0 by task v4l_id/5313 CPU: 1 PID: 5313 Comm: v4l_id Not tainted 5.1.0-rc5-319617-gd34f951 #4 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 em28xx 1-1:5.176: failed to pre-allocate USB transfer buffers for DVB. Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0xe8/0x16e lib/dump_stack.c:113 print_address_description+0x6c/0x236 mm/kasan/report.c:187 em28xx 1-1:5.176: Registering input extension kasan_report.cold+0x1a/0x3c mm/kasan/report.c:317 v4l2_fh_init+0x24c/0x290 drivers/media/v4l2-core/v4l2-fh.c:33 v4l2_fh_open+0x8d/0xd0 drivers/media/v4l2-core/v4l2-fh.c:71 em28xx_v4l2_open+0x11f/0x470 drivers/media/usb/em28xx/em28xx-video.c:2184 v4l2_open+0x1b6/0x360 drivers/media/v4l2-core/v4l2-dev.c:427 chrdev_open+0x220/0x5d0 fs/char_dev.c:417 do_dentry_open+0x49c/0x1130 fs/open.c:777 do_last fs/namei.c:3416 [inline] path_openat+0x147d/0x40b0 fs/namei.c:3533 do_filp_open+0x1a6/0x280 fs/namei.c:3563 do_sys_open+0x3c5/0x590 fs/open.c:1069 do_syscall_64+0xcf/0x4f0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fdb23b8d120 Code: 48 8b 15 1b 4d 2b 00 f7 d8 64 89 02 83 c8 ff c3 90 90 90 90 90 90 90 90 90 90 83 3d d5 a4 2b 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 5e 8c 01 00 48 89 04 24 RSP: 002b:00007ffc1aebde18 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007ffc1aebdf78 RCX: 00007fdb23b8d120 RDX: 00007fdb23e42138 RSI: 0000000000000000 RDI: 00007ffc1aebef17 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000400884 R13: 00007ffc1aebdf70 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 12: 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 kmalloc include/linux/slab.h:547 [inline] kzalloc include/linux/slab.h:742 [inline] em28xx_v4l2_init drivers/media/usb/em28xx/em28xx-video.c:2563 [inline] em28xx_v4l2_init.cold+0x93/0x3112 drivers/media/usb/em28xx/em28xx-video.c:2541 em28xx_init_extension+0x13a/0x200 drivers/media/usb/em28xx/em28xx-core.c:1128 request_module_async+0x62/0x70 drivers/media/usb/em28xx/em28xx-cards.c:3300 process_one_work+0x90f/0x1580 kernel/workqueue.c:2269 worker_thread+0x9b/0xe20 kernel/workqueue.c:2415 kthread+0x313/0x420 kernel/kthread.c:253 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Freed by task 12: 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+0x5e/0x140 mm/slub.c:1456 slab_free mm/slub.c:3003 [inline] kfree+0xce/0x280 mm/slub.c:3958 em28xx_free_v4l2 drivers/media/usb/em28xx/em28xx-video.c:2149 [inline] kref_put include/linux/kref.h:67 [inline] em28xx_v4l2_init drivers/media/usb/em28xx/em28xx-video.c:2920 [inline] em28xx_v4l2_init.cold+0x2cf/0x3112 drivers/media/usb/em28xx/em28xx-video.c:2541 em28xx_init_extension+0x13a/0x200 drivers/media/usb/em28xx/em28xx-core.c:1128 request_module_async+0x62/0x70 drivers/media/usb/em28xx/em28xx-cards.c:3300 process_one_work+0x90f/0x1580 kernel/workqueue.c:2269 worker_thread+0x9b/0xe20 kernel/workqueue.c:2415 kthread+0x313/0x420 kernel/kthread.c:253 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 The buggy address belongs to the object at ffff8880a4f14200 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 2000 bytes inside of 8192-byte region [ffff8880a4f14200, ffff8880a4f16200) The buggy address belongs to the page: page:ffffea000293c400 count:1 mapcount:0 mapping:ffff88812c3f4400 index:0x0 compound_mapcount: 0 flags: 0xfff00000010200(slab|head) raw: 00fff00000010200 dead000000000100 dead000000000200 ffff88812c3f4400 raw: 0000000000000000 0000000080030003 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a4f14880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a4f14900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880a4f14980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a4f14a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a4f14a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================