BUG: KASAN: slab-use-after-free in __mutex_lock_common kernel/locking/mutex.c:625 [inline] BUG: KASAN: slab-use-after-free in __mutex_lock+0x15ca/0x1bd0 kernel/locking/mutex.c:821 Read of size 8 at addr ffff888078b98458 by task syz-executor/13327 CPU: 0 UID: 0 PID: 13327 Comm: syz-executor Tainted: G S L syzkaller #0 PREEMPT(full) Tainted: [S]=CPU_OUT_OF_SPEC, [L]=SOFTLOCKUP Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x13d/0x4b0 mm/kasan/report.c:482 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595 __mutex_lock_common kernel/locking/mutex.c:625 [inline] __mutex_lock+0x15ca/0x1bd0 kernel/locking/mutex.c:821 ep_open+0x4c/0x2c0 drivers/usb/gadget/legacy/inode.c:823 do_dentry_open+0x6ab/0x14d0 fs/open.c:947 vfs_open+0x82/0x3f0 fs/open.c:1052 do_open fs/namei.c:4700 [inline] path_openat+0x2873/0x4280 fs/namei.c:4863 do_file_open+0x20e/0x430 fs/namei.c:4892 do_sys_openat2+0x10f/0x1e0 fs/open.c:1368 do_sys_open fs/open.c:1374 [inline] __do_compat_sys_openat fs/open.c:1436 [inline] __se_compat_sys_openat fs/open.c:1434 [inline] __ia32_compat_sys_openat+0x12d/0x210 fs/open.c:1434 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] do_int80_emulation+0x14b/0x720 arch/x86/entry/syscall_32.c:172 asm_int80_emulation+0x1a/0x20 arch/x86/include/asm/idtentry.h:598 RIP: 0023:0xf71174eb Code: 57 56 53 8b 44 24 14 f6 00 08 75 23 8b 44 24 18 8b 5c 24 1c 8b 4c 24 20 8b 54 24 24 8b 74 24 28 8b 7c 24 2c 8b 6c 24 30 cd 80 <5b> 5e 5f 5d c3 5b 5e 5f 5d e9 f7 a1 ff ff 66 90 66 90 66 90 90 53 RSP: 002b:00000000ffd2ab4c EFLAGS: 00000246 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 00000000ffffff9c RCX: 00000000ffd2ac90 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 13831: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x2e5/0x6c0 mm/slub.c:5489 _kmalloc_noprof include/linux/slab.h:988 [inline] _kzalloc_noprof include/linux/slab.h:1309 [inline] activate_ep_files drivers/usb/gadget/legacy/inode.c:1601 [inline] gadgetfs_bind+0x582/0x890 drivers/usb/gadget/legacy/inode.c:1692 gadget_bind_driver+0x28c/0xbf0 drivers/usb/gadget/udc/core.c:1662 call_driver_probe drivers/base/dd.c:628 [inline] really_probe+0x241/0xa60 drivers/base/dd.c:706 __driver_probe_device+0x20e/0x450 drivers/base/dd.c:868 driver_probe_device+0x4a/0x140 drivers/base/dd.c:898 __driver_attach+0x21f/0x5b0 drivers/base/dd.c:1292 bus_for_each_dev+0x13e/0x1d0 drivers/base/bus.c:383 bus_add_driver+0x305/0x5b0 drivers/base/bus.c:763 driver_register+0x1e2/0x360 drivers/base/driver.c:174 usb_gadget_register_driver_owner+0x132/0x210 drivers/usb/gadget/udc/core.c:1752 dev_config+0xdce/0x1610 drivers/usb/gadget/legacy/inode.c:1883 vfs_write+0x2aa/0x1050 fs/read_write.c:685 ksys_write+0x12a/0x250 fs/read_write.c:739 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0xe7/0x970 arch/x86/entry/syscall_32.c:307 do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:332 entry_SYSENTER_compat_after_hwframe+0x84/0x8e Freed by task 8044: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2677 [inline] slab_free mm/slub.c:6377 [inline] kfree+0x22b/0x6c0 mm/slub.c:6692 put_ep drivers/usb/gadget/legacy/inode.c:225 [inline] put_ep+0x117/0x150 drivers/usb/gadget/legacy/inode.c:217 destroy_ep_files+0x163/0x420 drivers/usb/gadget/legacy/inode.c:1582 gadgetfs_unbind+0x139/0x260 drivers/usb/gadget/legacy/inode.c:1655 gadget_unbind_driver+0x20c/0x4f0 drivers/usb/gadget/udc/core.c:1724 device_remove+0xcb/0x180 drivers/base/dd.c:616 __device_release_driver drivers/base/dd.c:1349 [inline] device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372 driver_detach+0xd8/0x1b0 drivers/base/dd.c:1435 bus_remove_driver+0x13b/0x2e0 drivers/base/bus.c:832 driver_unregister+0x76/0xb0 drivers/base/driver.c:202 usb_gadget_unregister_driver+0x49/0x70 drivers/usb/gadget/udc/core.c:1784 dev_release+0x132/0x1b0 drivers/usb/gadget/legacy/inode.c:1198 __fput+0x3ff/0xb50 fs/file_table.c:512 delayed_fput+0x72/0x90 fs/file_table.c:535 process_one_work+0xa23/0x1940 kernel/workqueue.c:3322 process_scheduled_works kernel/workqueue.c:3405 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 The buggy address belongs to the object at ffff888078b98400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 88 bytes inside of freed 512-byte region [ffff888078b98400, ffff888078b98600) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x78b98 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x4fff00000000040(head|node=1|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 04fff00000000040 ffff88801bc42c80 dead000000000100 dead000000000122 raw: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000 head: 04fff00000000040 ffff88801bc42c80 dead000000000100 dead000000000122 head: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000 head: 04fff00000000002 ffffffffffffff01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 13831, tgid 13829 (syz.0.1544), ts 573678120806, free_ts 551841662827 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1859 prep_new_page mm/page_alloc.c:1867 [inline] get_page_from_freelist+0xf48/0x3530 mm/page_alloc.c:3946 __alloc_frozen_pages_noprof+0x299/0x2dc0 mm/page_alloc.c:5304 alloc_slab_page mm/slub.c:3266 [inline] allocate_slab mm/slub.c:3380 [inline] new_slab+0xa2/0x640 mm/slub.c:3426 refill_objects+0xe3/0x410 mm/slub.c:7310 refill_sheaf mm/slub.c:2804 [inline] __pcs_replace_empty_main+0x376/0x680 mm/slub.c:4675 alloc_from_pcs mm/slub.c:4773 [inline] slab_alloc_node mm/slub.c:4905 [inline] __kmalloc_cache_noprof+0x479/0x6c0 mm/slub.c:5485 _kmalloc_noprof include/linux/slab.h:988 [inline] _kzalloc_noprof include/linux/slab.h:1309 [inline] activate_ep_files drivers/usb/gadget/legacy/inode.c:1601 [inline] gadgetfs_bind+0x582/0x890 drivers/usb/gadget/legacy/inode.c:1692 gadget_bind_driver+0x28c/0xbf0 drivers/usb/gadget/udc/core.c:1662 call_driver_probe drivers/base/dd.c:628 [inline] really_probe+0x241/0xa60 drivers/base/dd.c:706 __driver_probe_device+0x20e/0x450 drivers/base/dd.c:868 driver_probe_device+0x4a/0x140 drivers/base/dd.c:898 __driver_attach+0x21f/0x5b0 drivers/base/dd.c:1292 bus_for_each_dev+0x13e/0x1d0 drivers/base/bus.c:383 bus_add_driver+0x305/0x5b0 drivers/base/bus.c:763 driver_register+0x1e2/0x360 drivers/base/driver.c:174 page last free pid 13139 tgid 13139 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1406 [inline] __free_frozen_pages+0x79f/0x1090 mm/page_alloc.c:2950 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x47/0xf0 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x1a0/0x1f0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4584 [inline] slab_alloc_node mm/slub.c:4917 [inline] __kmalloc_cache_noprof+0x265/0x6c0 mm/slub.c:5485 _kmalloc_noprof include/linux/slab.h:988 [inline] _kzalloc_noprof include/linux/slab.h:1309 [inline] ref_tracker_alloc+0x190/0x590 lib/ref_tracker.c:270 __netdev_tracker_alloc include/linux/netdevice.h:4496 [inline] netdev_hold include/linux/netdevice.h:4525 [inline] netdev_hold include/linux/netdevice.h:4520 [inline] netdev_queue_add_kobject net/core/net-sysfs.c:1973 [inline] netdev_queue_update_kobjects+0x2db/0x6f0 net/core/net-sysfs.c:2035 register_queue_kobjects net/core/net-sysfs.c:2098 [inline] netdev_register_kobject+0x2e9/0x410 net/core/net-sysfs.c:2344 register_netdevice+0x15b6/0x25a0 net/core/dev.c:11446 veth_newlink+0x44a/0xa00 drivers/net/veth.c:1892 rtnl_newlink_create net/core/rtnetlink.c:3913 [inline] __rtnl_newlink net/core/rtnetlink.c:4044 [inline] rtnl_newlink+0x1499/0x2380 net/core/rtnetlink.c:4159 rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:7076 netlink_rcv_skb+0x159/0x420 net/netlink/af_netlink.c:2556 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x585/0x850 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x8b0/0xda0 net/netlink/af_netlink.c:1900 sock_sendmsg_nosec net/socket.c:775 [inline] __sock_sendmsg net/socket.c:790 [inline] __sys_sendto+0x48b/0x4e0 net/socket.c:2252 Memory state around the buggy address: ffff888078b98300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888078b98380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888078b98400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888078b98480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888078b98500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ---------------- Code disassembly (best guess): 0: 57 push %rdi 1: 56 push %rsi 2: 53 push %rbx 3: 8b 44 24 14 mov 0x14(%rsp),%eax 7: f6 00 08 testb $0x8,(%rax) a: 75 23 jne 0x2f c: 8b 44 24 18 mov 0x18(%rsp),%eax 10: 8b 5c 24 1c mov 0x1c(%rsp),%ebx 14: 8b 4c 24 20 mov 0x20(%rsp),%ecx 18: 8b 54 24 24 mov 0x24(%rsp),%edx 1c: 8b 74 24 28 mov 0x28(%rsp),%esi 20: 8b 7c 24 2c mov 0x2c(%rsp),%edi 24: 8b 6c 24 30 mov 0x30(%rsp),%ebp 28: cd 80 int $0x80 * 2a: 5b pop %rbx <-- trapping instruction 2b: 5e pop %rsi 2c: 5f pop %rdi 2d: 5d pop %rbp 2e: c3 ret 2f: 5b pop %rbx 30: 5e pop %rsi 31: 5f pop %rdi 32: 5d pop %rbp 33: e9 f7 a1 ff ff jmp 0xffffa22f 38: 66 90 xchg %ax,%ax 3a: 66 90 xchg %ax,%ax 3c: 66 90 xchg %ax,%ax 3e: 90 nop 3f: 53 push %rbx