================================================================== BUG: KASAN: use-after-free in ld_usb_interrupt_in_callback+0x40c/0x4c0 drivers/usb/misc/ldusb.c:276 Write of size 4 at addr ffff8881d4dec15c by task udevd/348 CPU: 0 PID: 348 Comm: udevd Not tainted 5.3.0-rc4+ #26 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+0x6a/0x32c mm/kasan/report.c:351 __kasan_report.cold+0x1a/0x33 mm/kasan/report.c:482 kasan_report+0xe/0x12 mm/kasan/common.c:612 ld_usb_interrupt_in_callback+0x40c/0x4c0 drivers/usb/misc/ldusb.c:276 __usb_hcd_giveback_urb+0x1f2/0x470 drivers/usb/core/hcd.c:1657 usb_hcd_giveback_urb+0x368/0x420 drivers/usb/core/hcd.c:1722 dummy_timer+0x120f/0x2fa2 drivers/usb/gadget/udc/dummy_hcd.c:1965 call_timer_fn+0x179/0x650 kernel/time/timer.c:1322 expire_timers kernel/time/timer.c:1366 [inline] __run_timers kernel/time/timer.c:1685 [inline] __run_timers kernel/time/timer.c:1653 [inline] run_timer_softirq+0x5cc/0x14b0 kernel/time/timer.c:1698 __do_softirq+0x221/0x912 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x178/0x1a0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:537 [inline] smp_apic_timer_interrupt+0x12f/0x500 arch/x86/kernel/apic/apic.c:1095 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 RIP: 0010:lock_acquire+0x16a/0x320 kernel/locking/lockdep.c:4416 Code: c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 95 01 00 00 c7 83 44 08 00 00 00 00 00 00 ff 34 24 9d <48> 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f c3 65 8b 15 40 19 dc 7e RSP: 0018:ffff8881d0a57c90 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: ffff8881d0a48000 RCX: 0000000000003938 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8881d0a48844 RBP: ffffffff86d83b40 R08: ffffffff88d3a5a0 R09: fffffbfff11ad393 R10: fffffbfff11ad392 R11: ffffffff88d69c97 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 __fs_reclaim_acquire mm/page_alloc.c:4077 [inline] fs_reclaim_acquire.part.0+0x20/0x30 mm/page_alloc.c:4088 slab_pre_alloc_hook mm/slab.h:498 [inline] slab_alloc_node mm/slub.c:2690 [inline] slab_alloc mm/slub.c:2778 [inline] kmem_cache_alloc+0x24/0x2d0 mm/slub.c:2783 shmem_alloc_inode+0x18/0x40 mm/shmem.c:3630 alloc_inode+0x61/0x1e0 fs/inode.c:227 new_inode_pseudo+0x14/0xe0 fs/inode.c:916 new_inode+0x1b/0x40 fs/inode.c:945 shmem_get_inode+0x84/0x7e0 mm/shmem.c:2228 shmem_mknod+0x5a/0x1f0 mm/shmem.c:2864 vfs_mknod fs/namei.c:3717 [inline] vfs_mknod+0x39b/0x5d0 fs/namei.c:3696 do_mknodat fs/namei.c:3769 [inline] do_mknodat+0x29a/0x420 fs/namei.c:3741 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f221200bd65 Code: 90 90 90 90 90 85 ff 48 89 f0 89 d6 75 27 48 8b 11 48 89 d1 83 e1 ff 48 39 ca 75 19 48 89 c7 89 d2 89 f6 b8 85 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 17 f3 c3 90 48 8b 05 a1 50 2b 00 64 c7 00 16 RSP: 002b:00007ffd4d9504b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000085 RAX: ffffffffffffffda RBX: 00000000018fa350 RCX: 00007f221200bd65 RDX: 000000000010bd98 RSI: 00000000000023b4 RDI: 00000000018fa350 RBP: 00000000018e8250 R08: 0000000000000000 R09: 00007f22120621a0 R10: 00007f221204fdc0 R11: 0000000000000246 R12: 00000000000023b4 R13: 000000000010bd98 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 17: save_stack+0x1b/0x80 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc mm/kasan/common.c:487 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:460 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:748 [inline] ld_usb_probe+0x6e/0xa65 drivers/usb/misc/ldusb.c:661 usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361 really_probe+0x281/0x6d0 drivers/base/dd.c:548 driver_probe_device+0x101/0x1b0 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:454 __device_attach+0x217/0x360 drivers/base/dd.c:894 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514 device_add+0xae6/0x16f0 drivers/base/core.c:2165 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+0x281/0x6d0 drivers/base/dd.c:548 driver_probe_device+0x101/0x1b0 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:454 __device_attach+0x217/0x360 drivers/base/dd.c:894 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514 device_add+0xae6/0x16f0 drivers/base/core.c:2165 usb_new_device.cold+0x6a4/0xe79 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+0x1b5c/0x3640 drivers/usb/core/hub.c:5441 process_one_work+0x92b/0x1530 kernel/workqueue.c:2269 worker_thread+0x96/0xe20 kernel/workqueue.c:2415 kthread+0x318/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Freed by task 17: save_stack+0x1b/0x80 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_slab_free+0x130/0x180 mm/kasan/common.c:449 slab_free_hook mm/slub.c:1423 [inline] slab_free_freelist_hook mm/slub.c:1474 [inline] slab_free mm/slub.c:3016 [inline] kfree+0xe4/0x2f0 mm/slub.c:3957 ld_usb_probe+0x728/0xa65 drivers/usb/misc/ldusb.c:744 usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361 really_probe+0x281/0x6d0 drivers/base/dd.c:548 driver_probe_device+0x101/0x1b0 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:454 __device_attach+0x217/0x360 drivers/base/dd.c:894 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514 device_add+0xae6/0x16f0 drivers/base/core.c:2165 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+0x281/0x6d0 drivers/base/dd.c:548 driver_probe_device+0x101/0x1b0 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:454 __device_attach+0x217/0x360 drivers/base/dd.c:894 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514 device_add+0xae6/0x16f0 drivers/base/core.c:2165 usb_new_device.cold+0x6a4/0xe79 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+0x1b5c/0x3640 drivers/usb/core/hub.c:5441 process_one_work+0x92b/0x1530 kernel/workqueue.c:2269 worker_thread+0x96/0xe20 kernel/workqueue.c:2415 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 ffff8881d4dec000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 348 bytes inside of 512-byte region [ffff8881d4dec000, ffff8881d4dec200) The buggy address belongs to the page: page:ffffea0007537b00 refcount:1 mapcount:0 mapping:ffff8881da002500 index:0x0 compound_mapcount: 0 flags: 0x200000000010200(slab|head) raw: 0200000000010200 ffffea0007420600 0000000300000003 ffff8881da002500 raw: 0000000000000000 00000000800c000c 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881d4dec000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881d4dec080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881d4dec100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881d4dec180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881d4dec200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================