================================================================== BUG: KASAN: use-after-free in ref_tracker_free+0x498/0x610 lib/ref_tracker.c:109 Read of size 1 at addr ffff88806f8cb350 by task syz-executor.5/3896 CPU: 1 PID: 3896 Comm: syz-executor.5 Not tainted 5.16.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0x8d/0x320 mm/kasan/report.c:247 __kasan_report mm/kasan/report.c:433 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:450 ref_tracker_free+0x498/0x610 lib/ref_tracker.c:109 netdev_tracker_free include/linux/netdevice.h:3863 [inline] dev_put_track include/linux/netdevice.h:3880 [inline] dev_put_track include/linux/netdevice.h:3876 [inline] packet_release+0x382/0xd00 net/packet/af_packet.c:3113 __sock_release+0xcd/0x280 net/socket.c:650 sock_close+0x18/0x20 net/socket.c:1315 __fput+0x286/0x9f0 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 exit_task_work include/linux/task_work.h:32 [inline] do_exit+0xc14/0x2b40 kernel/exit.c:832 do_group_exit+0x125/0x310 kernel/exit.c:929 get_signal+0x47d/0x2220 kernel/signal.c:2852 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f161bd3be99 Code: Unable to access opcode bytes at RIP 0x7f161bd3be6f. RSP: 002b:00007f161a690168 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: 00000000000001a8 RBX: 00007f161be4f030 RCX: 00007f161bd3be99 RDX: 04000000000001a8 RSI: 0000000020007fc0 RDI: 0000000000000006 RBP: 00007f161bd95ff1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff3b0ead9f R14: 00007f161a690300 R15: 0000000000022000 Allocated by task 3896: kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] ____kasan_kmalloc mm/kasan/common.c:472 [inline] __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:522 kmalloc include/linux/slab.h:590 [inline] kzalloc include/linux/slab.h:724 [inline] ref_tracker_alloc+0xe1/0x430 lib/ref_tracker.c:74 netdev_tracker_alloc include/linux/netdevice.h:3855 [inline] packet_do_bind+0x35a/0xc70 net/packet/af_packet.c:3231 packet_bind+0x152/0x1b0 net/packet/af_packet.c:3298 __sys_bind+0x1e9/0x250 net/socket.c:1694 __do_sys_bind net/socket.c:1705 [inline] __se_sys_bind net/socket.c:1703 [inline] __x64_sys_bind+0x6f/0xb0 net/socket.c:1703 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 13: kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free mm/kasan/common.c:328 [inline] __kasan_slab_free+0xff/0x130 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:1723 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1749 slab_free mm/slub.c:3513 [inline] kfree+0xf6/0x560 mm/slub.c:4561 ref_tracker_free+0x31f/0x610 lib/ref_tracker.c:137 netdev_tracker_free include/linux/netdevice.h:3863 [inline] dev_put_track include/linux/netdevice.h:3880 [inline] dst_destroy+0x14f/0x400 net/core/dst.c:120 rcu_do_batch kernel/rcu/tree.c:2506 [inline] rcu_core+0x7ab/0x14a0 kernel/rcu/tree.c:2741 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 The buggy address belongs to the object at ffff88806f8cb340 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 16 bytes inside of 32-byte region [ffff88806f8cb340, ffff88806f8cb360) The buggy address belongs to the page: page:ffffea0001be32c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x6f8cb flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 0000000000000000 dead000000000122 ffff888010c41500 raw: 0000000000000000 0000000000400040 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 3890, ts 134281668973, free_ts 132842901956 prep_new_page mm/page_alloc.c:2418 [inline] get_page_from_freelist+0xa72/0x2f50 mm/page_alloc.c:4149 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5369 __alloc_pages_node include/linux/gfp.h:570 [inline] alloc_slab_page mm/slub.c:1795 [inline] allocate_slab mm/slub.c:1930 [inline] new_slab+0xab/0x4a0 mm/slub.c:1993 ___slab_alloc+0x918/0xfe0 mm/slub.c:3022 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3109 slab_alloc_node mm/slub.c:3200 [inline] __kmalloc_node+0x2cb/0x390 mm/slub.c:4467 kmalloc_array_node include/linux/slab.h:686 [inline] kcalloc_node include/linux/slab.h:691 [inline] memcg_alloc_page_obj_cgroups+0x8b/0x140 mm/memcontrol.c:2827 account_slab_page mm/slab.h:424 [inline] allocate_slab mm/slub.c:1946 [inline] new_slab+0x383/0x4a0 mm/slub.c:1993 ___slab_alloc+0x918/0xfe0 mm/slub.c:3022 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3109 slab_alloc_node mm/slub.c:3200 [inline] kmem_cache_alloc_node+0x122/0x3f0 mm/slub.c:3270 alloc_task_struct_node kernel/fork.c:170 [inline] dup_task_struct kernel/fork.c:882 [inline] copy_process+0x5c4/0x75a0 kernel/fork.c:2023 kernel_clone+0xe7/0xab0 kernel/fork.c:2582 __do_sys_clone+0xc8/0x110 kernel/fork.c:2699 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1338 [inline] free_pcp_prepare+0x374/0x870 mm/page_alloc.c:1389 free_unref_page_prepare mm/page_alloc.c:3309 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3388 qlink_free mm/kasan/quarantine.c:146 [inline] qlist_free_all+0x5a/0xc0 mm/kasan/quarantine.c:165 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:259 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc_node mm/slub.c:3234 [inline] slab_alloc mm/slub.c:3242 [inline] kmem_cache_alloc_trace+0x1e9/0x2c0 mm/slub.c:3259 kmalloc include/linux/slab.h:590 [inline] kzalloc include/linux/slab.h:724 [inline] ref_tracker_alloc+0xe1/0x430 lib/ref_tracker.c:74 netdev_tracker_alloc include/linux/netdevice.h:3855 [inline] dev_hold_track include/linux/netdevice.h:3872 [inline] dev_hold_track include/linux/netdevice.h:3867 [inline] netdev_queue_add_kobject net/core/net-sysfs.c:1650 [inline] netdev_queue_update_kobjects+0x1a7/0x4e0 net/core/net-sysfs.c:1705 register_queue_kobjects net/core/net-sysfs.c:1766 [inline] netdev_register_kobject+0x35a/0x430 net/core/net-sysfs.c:2012 register_netdevice+0xd31/0x1500 net/core/dev.c:9660 cfg80211_register_netdevice+0x153/0x320 net/wireless/core.c:1372 ieee80211_if_add+0x1187/0x1b60 net/mac80211/iface.c:2146 ieee80211_register_hw+0x3d1b/0x3ed0 net/mac80211/main.c:1314 mac80211_hwsim_new_radio+0x24b9/0x4b20 drivers/net/wireless/mac80211_hwsim.c:3484 hwsim_new_radio_nl+0x9bc/0x1080 drivers/net/wireless/mac80211_hwsim.c:4053 genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:731 Memory state around the buggy address: ffff88806f8cb200: 00 00 00 00 fc fc fc fc fa fb fb fb fc fc fc fc ffff88806f8cb280: fa fb fb fb fc fc fc fc 00 00 00 00 fc fc fc fc >ffff88806f8cb300: 00 00 00 00 fc fc fc fc fa fb fb fb fc fc fc fc ^ ffff88806f8cb380: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ffff88806f8cb400: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ==================================================================