================================================================== BUG: KASAN: slab-use-after-free in rose_transmit_link+0x5ba/0x740 net/rose/rose_link.c:266 Read of size 1 at addr ffff8880660ca432 by task syz.3.2548/22473 CPU: 1 PID: 22473 Comm: syz.3.2548 Not tainted 6.6.101-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xac/0x220 mm/kasan/report.c:468 kasan_report+0x117/0x150 mm/kasan/report.c:581 rose_transmit_link+0x5ba/0x740 net/rose/rose_link.c:266 rose_write_internal+0x11d1/0x1ab0 net/rose/rose_subr.c:198 rose_release+0x24e/0x510 net/rose/af_rose.c:671 __sock_release net/socket.c:659 [inline] sock_close+0xbd/0x230 net/socket.c:1421 __fput+0x234/0x970 fs/file_table.c:384 task_work_run+0x1ce/0x250 kernel/task_work.c:239 get_signal+0x1235/0x1400 kernel/signal.c:2678 arch_do_signal_or_restart+0x96/0x780 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f174938ebe9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f174a1da038 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: fffffffffffffe00 RBX: 00007f17495b6090 RCX: 00007f174938ebe9 RDX: 0000000000000040 RSI: 0000200000000100 RDI: 0000000000000008 RBP: 00007f1749411e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f17495b6128 R14: 00007f17495b6090 R15: 00007ffe5a2d4198 Allocated by task 21750: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:383 kmalloc include/linux/slab.h:600 [inline] rose_add_node+0x23a/0xdd0 net/rose/rose_route.c:85 rose_rt_ioctl+0xa42/0xfb0 net/rose/rose_route.c:740 rose_ioctl+0x3cf/0x8b0 net/rose/af_rose.c:1380 sock_do_ioctl+0xd7/0x2f0 net/socket.c:1222 sock_ioctl+0x623/0x7a0 net/socket.c:1341 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Freed by task 22470: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x2e/0x50 mm/kasan/generic.c:522 ____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:164 [inline] slab_free_hook mm/slub.c:1806 [inline] slab_free_freelist_hook+0x130/0x1b0 mm/slub.c:1832 slab_free mm/slub.c:3816 [inline] __kmem_cache_free+0xba/0x1f0 mm/slub.c:3829 rose_rt_device_down+0x43d/0x490 net/rose/rose_route.c:515 rose_device_event+0x604/0x690 net/rose/af_rose.c:248 notifier_call_chain+0x197/0x390 kernel/notifier.c:93 call_netdevice_notifiers_extack net/core/dev.c:2064 [inline] call_netdevice_notifiers net/core/dev.c:2078 [inline] __dev_notify_flags+0x18e/0x2e0 net/core/dev.c:-1 dev_change_flags+0xe8/0x1a0 net/core/dev.c:8750 dev_ifsioc+0x6a7/0xe20 net/core/dev_ioctl.c:529 dev_ioctl+0x7e2/0x1170 net/core/dev_ioctl.c:786 sock_do_ioctl+0x226/0x2f0 net/socket.c:1236 sock_ioctl+0x623/0x7a0 net/socket.c:1341 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Last potentially related work creation: kasan_save_stack+0x3e/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:492 kvfree_call_rcu+0xee/0x780 kernel/rcu/tree.c:3452 __ipv6_dev_mc_dec+0x2cc/0x330 net/ipv6/mcast.c:982 ipv6_mc_destroy_dev+0x338/0x590 net/ipv6/mcast.c:2805 addrconf_ifdown+0x139f/0x1880 net/ipv6/addrconf.c:3969 addrconf_notify+0x6c6/0x1010 net/ipv6/addrconf.c:-1 notifier_call_chain+0x197/0x390 kernel/notifier.c:93 call_netdevice_notifiers_extack net/core/dev.c:2064 [inline] call_netdevice_notifiers net/core/dev.c:2078 [inline] unregister_netdevice_many_notify+0xf36/0x1810 net/core/dev.c:11074 unregister_netdevice_many net/core/dev.c:11130 [inline] default_device_exit_batch+0x9cb/0xa60 net/core/dev.c:11608 ops_exit_list net/core/net_namespace.c:178 [inline] cleanup_net+0x77f/0xb90 net/core/net_namespace.c:652 process_one_work kernel/workqueue.c:2634 [inline] process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 Second to last potentially related work creation: kasan_save_stack+0x3e/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:492 kvfree_call_rcu+0xee/0x780 kernel/rcu/tree.c:3452 __ipv6_dev_mc_dec+0x2cc/0x330 net/ipv6/mcast.c:982 ipv6_mc_destroy_dev+0x338/0x590 net/ipv6/mcast.c:2805 addrconf_ifdown+0x139f/0x1880 net/ipv6/addrconf.c:3969 addrconf_notify+0x6c6/0x1010 net/ipv6/addrconf.c:-1 notifier_call_chain+0x197/0x390 kernel/notifier.c:93 call_netdevice_notifiers_extack net/core/dev.c:2064 [inline] call_netdevice_notifiers net/core/dev.c:2078 [inline] unregister_netdevice_many_notify+0xf36/0x1810 net/core/dev.c:11074 unregister_netdevice_many net/core/dev.c:11130 [inline] unregister_netdevice_queue+0x324/0x360 net/core/dev.c:11010 unregister_netdevice include/linux/netdevice.h:3137 [inline] nsim_destroy+0x4d/0x180 drivers/net/netdevsim/netdev.c:418 __nsim_dev_port_del+0x14d/0x1b0 drivers/net/netdevsim/dev.c:1428 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1440 [inline] nsim_dev_reload_destroy+0x283/0x480 drivers/net/netdevsim/dev.c:1661 nsim_dev_reload_down+0x8a/0xc0 drivers/net/netdevsim/dev.c:968 devlink_reload+0x137/0x600 net/devlink/dev.c:389 devlink_pernet_pre_exit+0x18a/0x340 net/devlink/core.c:288 ops_pre_exit_list net/core/net_namespace.c:163 [inline] cleanup_net+0x57f/0xb90 net/core/net_namespace.c:632 process_one_work kernel/workqueue.c:2634 [inline] process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 The buggy address belongs to the object at ffff8880660ca400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 50 bytes inside of freed 512-byte region [ffff8880660ca400, ffff8880660ca600) The buggy address belongs to the physical page: page:ffffea0001983200 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880660c9000 pfn:0x660c8 head:ffffea0001983200 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888017841c80 ffffea0001155610 ffffea00018cd710 raw: ffff8880660c9000 000000000010000b 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 19530, tgid 19530 (syz-executor), ts 1636394279244, free_ts 1636238858206 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1cd/0x210 mm/page_alloc.c:1554 prep_new_page mm/page_alloc.c:1561 [inline] get_page_from_freelist+0x195c/0x19f0 mm/page_alloc.c:3191 __alloc_pages+0x1e3/0x460 mm/page_alloc.c:4457 alloc_slab_page+0x5d/0x170 mm/slub.c:1876 allocate_slab mm/slub.c:2023 [inline] new_slab+0x87/0x2e0 mm/slub.c:2076 ___slab_alloc+0xc6d/0x12f0 mm/slub.c:3230 __slab_alloc mm/slub.c:3329 [inline] __slab_alloc_node mm/slub.c:3382 [inline] slab_alloc_node mm/slub.c:3475 [inline] __kmem_cache_alloc_node+0x1a2/0x260 mm/slub.c:3524 kmalloc_trace+0x2a/0xe0 mm/slab_common.c:1098 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:721 [inline] __nsim_dev_port_add+0x1b1/0xb00 drivers/net/netdevsim/dev.c:1366 nsim_dev_port_add_all+0x35/0xe0 drivers/net/netdevsim/dev.c:1449 nsim_drv_probe+0x884/0xb70 drivers/net/netdevsim/dev.c:1607 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x25b/0xb40 drivers/base/dd.c:658 __driver_probe_device+0x18c/0x330 drivers/base/dd.c:800 driver_probe_device+0x4f/0x420 drivers/base/dd.c:830 __device_attach_driver+0x2ca/0x520 drivers/base/dd.c:958 bus_for_each_drv+0x24b/0x2d0 drivers/base/bus.c:459 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1154 [inline] free_unref_page_prepare+0x7ce/0x8e0 mm/page_alloc.c:2336 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2429 free_large_kmalloc+0x101/0x1a0 mm/slab_common.c:984 rate_control_free_sta net/mac80211/rate.h:52 [inline] sta_info_free+0x576/0x670 net/mac80211/sta_info.c:429 __sta_info_flush+0x3da/0x4e0 net/mac80211/sta_info.c:1623 sta_info_flush net/mac80211/sta_info.h:913 [inline] ieee80211_ibss_disconnect+0x262/0x700 net/mac80211/ibss.c:698 ieee80211_ibss_leave+0x25/0x140 net/mac80211/ibss.c:1872 rdev_leave_ibss net/wireless/rdev-ops.h:573 [inline] __cfg80211_leave_ibss+0x1d2/0x400 net/wireless/ibss.c:210 cfg80211_leave net/wireless/core.c:1353 [inline] cfg80211_netdev_notifier_call+0x1cb/0x13a0 net/wireless/core.c:1515 notifier_call_chain+0x197/0x390 kernel/notifier.c:93 call_netdevice_notifiers_extack net/core/dev.c:2064 [inline] call_netdevice_notifiers net/core/dev.c:2078 [inline] __dev_close_many+0x107/0x2a0 net/core/dev.c:1564 dev_close_many+0x223/0x400 net/core/dev.c:1615 dev_close+0x150/0x200 net/core/dev.c:1641 cfg80211_shutdown_all_interfaces+0xbb/0x1d0 net/wireless/core.c:280 ieee80211_remove_interfaces+0x107/0x680 net/mac80211/iface.c:2321 ieee80211_unregister_hw+0x5d/0x2a0 net/mac80211/main.c:1512 Memory state around the buggy address: ffff8880660ca300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880660ca380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880660ca400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880660ca480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880660ca500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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