================================================================== BUG: KASAN: slab-use-after-free in tcf_action_destroy+0x17f/0x1b0 net/sched/act_api.c:1121 Read of size 8 at addr ffff88803906da00 by task kworker/u4:44/29291 CPU: 1 PID: 29291 Comm: kworker/u4:44 Not tainted 6.3.0-rc5-syzkaller-00022-g76f598ba7d8e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 Workqueue: tc_filter_workqueue fl_destroy_filter_work Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:319 print_report mm/kasan/report.c:430 [inline] kasan_report+0x11c/0x130 mm/kasan/report.c:536 tcf_action_destroy+0x17f/0x1b0 net/sched/act_api.c:1121 tcf_exts_destroy+0xc5/0x160 net/sched/cls_api.c:3248 __fl_destroy_filter+0x1a/0x100 net/sched/cls_flower.c:418 process_one_work+0x991/0x15c0 kernel/workqueue.c:2390 worker_thread+0x669/0x1090 kernel/workqueue.c:2537 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Allocated by task 18497: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] ____kasan_kmalloc mm/kasan/common.c:333 [inline] __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:383 kmalloc include/linux/slab.h:580 [inline] kmalloc_array include/linux/slab.h:635 [inline] kcalloc include/linux/slab.h:667 [inline] tcf_exts_init_ex+0xe4/0x5a0 net/sched/cls_api.c:3218 fl_change+0x56f/0x4ac0 net/sched/cls_flower.c:2237 tc_new_tfilter+0x97c/0x2290 net/sched/cls_api.c:2310 rtnetlink_rcv_msg+0x996/0xd50 net/core/rtnetlink.c:6165 netlink_rcv_skb+0x165/0x440 net/netlink/af_netlink.c:2574 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline] netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1365 netlink_sendmsg+0x925/0xe30 net/netlink/af_netlink.c:1942 sock_sendmsg_nosec net/socket.c:724 [inline] sock_sendmsg+0xde/0x190 net/socket.c:747 ____sys_sendmsg+0x71c/0x900 net/socket.c:2501 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2555 __sys_sendmsg+0xf7/0x1c0 net/socket.c:2584 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 Freed by task 18497: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:521 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:162 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807 slab_free mm/slub.c:3787 [inline] __kmem_cache_free+0xaf/0x2d0 mm/slub.c:3800 tcf_exts_destroy+0xe5/0x160 net/sched/cls_api.c:3249 tcf_exts_init_ex net/sched/cls_api.c:3237 [inline] tcf_exts_init_ex+0x484/0x5a0 net/sched/cls_api.c:3205 fl_change+0x56f/0x4ac0 net/sched/cls_flower.c:2237 tc_new_tfilter+0x97c/0x2290 net/sched/cls_api.c:2310 rtnetlink_rcv_msg+0x996/0xd50 net/core/rtnetlink.c:6165 netlink_rcv_skb+0x165/0x440 net/netlink/af_netlink.c:2574 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline] netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1365 netlink_sendmsg+0x925/0xe30 net/netlink/af_netlink.c:1942 sock_sendmsg_nosec net/socket.c:724 [inline] sock_sendmsg+0xde/0x190 net/socket.c:747 ____sys_sendmsg+0x71c/0x900 net/socket.c:2501 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2555 __sys_sendmsg+0xf7/0x1c0 net/socket.c:2584 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 The buggy address belongs to the object at ffff88803906da00 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 0 bytes inside of freed 256-byte region [ffff88803906da00, ffff88803906db00) The buggy address belongs to the physical page: page:ffffea0000e41b00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3906c head:ffffea0000e41b00 order:1 entire_mapcount:0 nr_pages_mapped:0 pincount:0 ksm flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffff888012441b40 ffffea00020d4600 0000000000000003 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0x152820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 28531, tgid 28527 (syz-executor.0), ts 2420373501727, free_ts 2399364260284 prep_new_page mm/page_alloc.c:2553 [inline] get_page_from_freelist+0x1190/0x2e20 mm/page_alloc.c:4326 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:5592 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2283 alloc_slab_page mm/slub.c:1851 [inline] allocate_slab+0x25f/0x390 mm/slub.c:1998 new_slab mm/slub.c:2051 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3193 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3292 __slab_alloc_node mm/slub.c:3345 [inline] slab_alloc_node mm/slub.c:3442 [inline] __kmem_cache_alloc_node+0x136/0x320 mm/slub.c:3491 kmalloc_trace+0x26/0xe0 mm/slab_common.c:1061 kmalloc include/linux/slab.h:580 [inline] kzalloc include/linux/slab.h:720 [inline] ____ip_mc_inc_group+0x26e/0xd30 net/ipv4/igmp.c:1449 br_ip4_multicast_join_snoopers.isra.0+0x3c/0xc0 net/bridge/br_multicast.c:4097 br_multicast_join_snoopers+0x84/0x110 net/bridge/br_multicast.c:4117 br_dev_open+0xd0/0xf0 net/bridge/br_device.c:181 __dev_open+0x297/0x4d0 net/core/dev.c:1417 dev_open net/core/dev.c:1453 [inline] dev_open+0xec/0x150 net/core/dev.c:1446 bond_enslave+0x9fb/0x5a00 drivers/net/bonding/bond_main.c:1976 do_set_master+0x1c8/0x220 net/core/rtnetlink.c:2623 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1454 [inline] free_pcp_prepare+0x5d5/0xa50 mm/page_alloc.c:1504 free_unref_page_prepare mm/page_alloc.c:3388 [inline] free_unref_page+0x1d/0x490 mm/page_alloc.c:3483 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2637 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x192/0x220 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x63/0x90 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook mm/slab.h:769 [inline] slab_alloc_node mm/slub.c:3452 [inline] kmem_cache_alloc_node+0x185/0x3e0 mm/slub.c:3497 alloc_task_struct_node kernel/fork.c:171 [inline] dup_task_struct kernel/fork.c:971 [inline] copy_process+0x3aa/0x7590 kernel/fork.c:2095 kernel_clone+0xeb/0x890 kernel/fork.c:2679 __do_compat_sys_ia32_clone+0x9e/0xd0 arch/x86/kernel/sys_ia32.c:254 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] do_int80_syscall_32+0x4a/0x90 arch/x86/entry/common.c:132 entry_INT80_compat+0x8f/0xa0 arch/x86/entry/entry_64_compat.S:353 Memory state around the buggy address: ffff88803906d900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88803906d980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88803906da00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88803906da80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88803906db00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================