KASAN: use-after-free Read in usbvision_v4l2

Title	Replies (including bot)	Last reply
KASAN: use-after-free Read in usbvision_v4l2_open	12 (15)	2019/12/12 16:52

================================================================== BUG: KASAN: use-after-free in __mutex_lock_common kernel/locking/mutex.c:1043 [inline] BUG: KASAN: use-after-free in __mutex_lock+0x124d/0x1360 kernel/locking/mutex.c:1106 Read of size 8 at addr ffff8881cad4d8b8 by task v4l_id/4526 CPU: 0 PID: 4526 Comm: v4l_id Not tainted 5.4.0-syzkaller #0 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+0xef/0x16e lib/dump_stack.c:118 print_address_description.constprop.0+0x36/0x50 mm/kasan/report.c:374 __kasan_report.cold+0x1a/0x33 mm/kasan/report.c:506 kasan_report+0xe/0x20 mm/kasan/common.c:638 __mutex_lock_common kernel/locking/mutex.c:1043 [inline] __mutex_lock+0x124d/0x1360 kernel/locking/mutex.c:1106 usbvision_v4l2_open+0x77/0x340 drivers/media/usb/usbvision/usbvision-video.c:314 v4l2_open+0x20f/0x3d0 drivers/media/v4l2-core/v4l2-dev.c:423 chrdev_open+0x219/0x5c0 fs/char_dev.c:414 do_dentry_open+0x494/0x1120 fs/open.c:797 do_last fs/namei.c:3412 [inline] path_openat+0x142b/0x4030 fs/namei.c:3529 do_filp_open+0x1a1/0x280 fs/namei.c:3559 do_sys_open+0x3c0/0x580 fs/open.c:1097 do_syscall_64+0xb7/0x5b0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f70d3cab120 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:00007ffc46d40ca8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007ffc46d40e08 RCX: 00007f70d3cab120 RDX: 00007f70d3f60138 RSI: 0000000000000000 RDI: 00007ffc46d42f1d RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000400884 R13: 00007ffc46d40e00 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 12: save_stack+0x1b/0x80 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_kmalloc mm/kasan/common.c:512 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:485 kmalloc include/linux/slab.h:556 [inline] kzalloc include/linux/slab.h:670 [inline] usbvision_alloc drivers/media/usb/usbvision/usbvision-video.c:1315 [inline] usbvision_probe.cold+0x5c5/0x1f1e drivers/media/usb/usbvision/usbvision-video.c:1469 usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361 really_probe+0x281/0x6d0 drivers/base/dd.c:548 driver_probe_device+0x104/0x210 drivers/base/dd.c:721 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430 __device_attach+0x217/0x360 drivers/base/dd.c:894 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490 device_add+0x1480/0x1c20 drivers/base/core.c:2487 usb_set_configuration+0xe67/0x1740 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+0x281/0x6d0 drivers/base/dd.c:548 driver_probe_device+0x104/0x210 drivers/base/dd.c:721 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430 __device_attach+0x217/0x360 drivers/base/dd.c:894 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490 device_add+0x1480/0x1c20 drivers/base/core.c:2487 usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2537 hub_port_connect drivers/usb/core/hub.c:5184 [inline] hub_port_connect_change drivers/usb/core/hub.c:5324 [inline] port_event drivers/usb/core/hub.c:5470 [inline] hub_event+0x1e59/0x3860 drivers/usb/core/hub.c:5552 process_one_work+0x92b/0x1530 kernel/workqueue.c:2264 worker_thread+0x96/0xe20 kernel/workqueue.c:2410 kthread+0x318/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Freed by task 3310: save_stack+0x1b/0x80 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] kasan_set_free_info mm/kasan/common.c:334 [inline] __kasan_slab_free+0x130/0x180 mm/kasan/common.c:473 slab_free_hook mm/slub.c:1425 [inline] slab_free_freelist_hook mm/slub.c:1458 [inline] slab_free mm/slub.c:3005 [inline] kfree+0xdc/0x310 mm/slub.c:3957 usbvision_release+0x181/0x1c0 drivers/media/usb/usbvision/usbvision-video.c:1364 usbvision_disconnect+0x171/0x1e0 drivers/media/usb/usbvision/usbvision-video.c:1589 usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:423 __device_release_driver drivers/base/dd.c:1134 [inline] device_release_driver_internal+0x42f/0x500 drivers/base/dd.c:1165 bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:532 device_del+0x481/0xd30 drivers/base/core.c:2664 usb_disable_device+0x211/0x690 drivers/usb/core/message.c:1237 usb_disconnect+0x284/0x8d0 drivers/usb/core/hub.c:2200 hub_port_connect drivers/usb/core/hub.c:5035 [inline] hub_port_connect_change drivers/usb/core/hub.c:5324 [inline] port_event drivers/usb/core/hub.c:5470 [inline] hub_event+0x1753/0x3860 drivers/usb/core/hub.c:5552 process_one_work+0x92b/0x1530 kernel/workqueue.c:2264 worker_thread+0x96/0xe20 kernel/workqueue.c:2410 kthread+0x318/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 The buggy address belongs to the object at ffff8881cad4c000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 6328 bytes inside of 8192-byte region [ffff8881cad4c000, ffff8881cad4e000) The buggy address belongs to the page: page:ffffea00072b5200 refcount:1 mapcount:0 mapping:ffff8881da40c500 index:0x0 compound_mapcount: 0 raw: 0200000000010200 ffffea0007249a00 0000000200000002 ffff8881da40c500 raw: 0000000000000000 0000000080020002 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881cad4d780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881cad4d800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881cad4d880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881cad4d900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881cad4d980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================