================================================================== BUG: KASAN: use-after-free in usb_submit_urb+0x11c7/0x14e0 drivers/usb/core/urb.c:383 Read of size 4 at addr ffff88810dba7018 by task syz-executor.1/18972 CPU: 0 PID: 18972 Comm: syz-executor.1 Not tainted 5.11.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:230 __kasan_report mm/kasan/report.c:396 [inline] kasan_report.cold+0x79/0xd5 mm/kasan/report.c:413 usb_submit_urb+0x11c7/0x14e0 drivers/usb/core/urb.c:383 service_outstanding_interrupt.part.0+0x5f/0xa0 drivers/usb/class/cdc-wdm.c:470 service_outstanding_interrupt drivers/usb/class/cdc-wdm.c:465 [inline] wdm_read+0x9a0/0xbd0 drivers/usb/class/cdc-wdm.c:583 vfs_read+0x1b5/0x570 fs/read_write.c:494 ksys_read+0x12d/0x250 fs/read_write.c:634 do_syscall_64+0x2d/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e299 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f9ab6fa3c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e299 RDX: 0000000000001000 RSI: 0000000020001000 RDI: 0000000000000005 RBP: 000000000119c110 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c0dc R13: 00007ffe6c95e34f R14: 00007f9ab6fa49c0 R15: 000000000119c0dc Allocated by task 7752: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:401 [inline] ____kasan_kmalloc.constprop.0+0x82/0xa0 mm/kasan/common.c:429 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:682 [inline] usb_alloc_dev+0x51/0xea0 drivers/usb/core/usb.c:582 hub_port_connect drivers/usb/core/hub.c:5129 [inline] hub_port_connect_change drivers/usb/core/hub.c:5363 [inline] port_event drivers/usb/core/hub.c:5509 [inline] hub_event+0x1def/0x42d0 drivers/usb/core/hub.c:5591 process_one_work+0x98d/0x1580 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x38c/0x460 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Freed by task 7953: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:354 ____kasan_slab_free+0xe1/0x110 mm/kasan/common.c:362 kasan_slab_free include/linux/kasan.h:188 [inline] slab_free_hook mm/slub.c:1547 [inline] slab_free_freelist_hook+0x5d/0x150 mm/slub.c:1580 slab_free mm/slub.c:3143 [inline] kfree+0xe5/0x610 mm/slub.c:4125 device_release+0x9f/0x240 drivers/base/core.c:1962 kobject_cleanup lib/kobject.c:705 [inline] kobject_release lib/kobject.c:736 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1c8/0x540 lib/kobject.c:753 put_device+0x1b/0x30 drivers/base/core.c:3190 hub_port_connect drivers/usb/core/hub.c:5074 [inline] hub_port_connect_change drivers/usb/core/hub.c:5363 [inline] port_event drivers/usb/core/hub.c:5509 [inline] hub_event+0x1c8a/0x42d0 drivers/usb/core/hub.c:5591 process_one_work+0x98d/0x1580 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x38c/0x460 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xc0/0xf0 mm/kasan/generic.c:342 __call_rcu kernel/rcu/tree.c:2965 [inline] call_rcu+0xb9/0x740 kernel/rcu/tree.c:3038 netlink_release+0xd33/0x1c50 net/netlink/af_netlink.c:802 __sock_release+0xcd/0x280 net/socket.c:597 sock_close+0x18/0x20 net/socket.c:1256 __fput+0x288/0x920 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:140 exit_task_work include/linux/task_work.h:30 [inline] do_exit+0xb8e/0x2850 kernel/exit.c:823 do_group_exit+0x125/0x310 kernel/exit.c:920 __do_sys_exit_group kernel/exit.c:931 [inline] __se_sys_exit_group kernel/exit.c:929 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:929 do_syscall_64+0x2d/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Second to last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xc0/0xf0 mm/kasan/generic.c:342 __call_rcu kernel/rcu/tree.c:2965 [inline] call_rcu+0xb9/0x740 kernel/rcu/tree.c:3038 netlink_release+0xd33/0x1c50 net/netlink/af_netlink.c:802 __sock_release+0xcd/0x280 net/socket.c:597 sock_close+0x18/0x20 net/socket.c:1256 __fput+0x288/0x920 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:140 exit_task_work include/linux/task_work.h:30 [inline] do_exit+0xb8e/0x2850 kernel/exit.c:823 do_group_exit+0x125/0x310 kernel/exit.c:920 __do_sys_exit_group kernel/exit.c:931 [inline] __se_sys_exit_group kernel/exit.c:929 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:929 do_syscall_64+0x2d/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff88810dba7000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 24 bytes inside of 2048-byte region [ffff88810dba7000, ffff88810dba7800) The buggy address belongs to the page: page:00000000fcc1b326 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88810dba0000 pfn:0x10dba0 head:00000000fcc1b326 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x200000000010200(slab|head) raw: 0200000000010200 ffffea000405de08 ffffea000410a408 ffff888100042000 raw: ffff88810dba0000 0000000000080004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88810dba6f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88810dba6f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88810dba7000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88810dba7080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88810dba7100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================