================================================================== BUG: KASAN: use-after-free in tcf_action_destroy+0x17f/0x1b0 net/sched/act_api.c:1121 Read of size 8 at addr ffff888144edda00 by task kworker/u4:0/9 CPU: 1 PID: 9 Comm: kworker/u4:0 Not tainted 6.2.0-syzkaller-05261-gfd2a55e74a99 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023 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+0x28/0x360 mm/kasan/report.c:306 print_report mm/kasan/report.c:417 [inline] kasan_report+0x11c/0x130 mm/kasan/report.c:517 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+0x9bf/0x1820 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 5075: 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+0xa5/0xb0 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/0x4ab0 net/sched/cls_flower.c:2234 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:722 [inline] sock_sendmsg+0xde/0x190 net/socket.c:745 ____sys_sendmsg+0x71c/0x900 net/socket.c:2504 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2558 __sys_sendmsg+0xf7/0x1c0 net/socket.c:2587 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 5075: 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:523 ____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:177 [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/0x4ab0 net/sched/cls_flower.c:2234 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:722 [inline] sock_sendmsg+0xde/0x190 net/socket.c:745 ____sys_sendmsg+0x71c/0x900 net/socket.c:2504 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2558 __sys_sendmsg+0xf7/0x1c0 net/socket.c:2587 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff888144edda00 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 0 bytes inside of 256-byte region [ffff888144edda00, ffff888144eddb00) The buggy address belongs to the physical page: page:ffffea000513b700 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x144edc head:ffffea000513b700 order:1 compound_mapcount:0 subpages_mapcount:0 compound_pincount:0 anon flags: 0x57ff00000010200(slab|head|node=1|zone=2|lastcpupid=0x7ff) raw: 057ff00000010200 ffff888012441b40 0000000000000000 dead000000000001 raw: 0000000000000000 0000000080100010 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 12066229885, free_ts 0 prep_new_page mm/page_alloc.c:2531 [inline] get_page_from_freelist+0x119c/0x2d00 mm/page_alloc.c:4283 __alloc_pages+0x1cb/0x5c0 mm/page_alloc.c:5549 alloc_page_interleave+0x1e/0x200 mm/mempolicy.c:2120 alloc_pages+0x233/0x270 mm/mempolicy.c:2282 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+0x136/0x330 mm/slub.c:3491 kmalloc_trace+0x26/0x60 mm/slab_common.c:1062 kmalloc include/linux/slab.h:580 [inline] kzalloc include/linux/slab.h:720 [inline] blk_iolatency_init+0x46/0x230 block/blk-iolatency.c:763 blkcg_init_disk+0x1ee/0x6c0 block/blk-cgroup.c:1331 __alloc_disk_node+0x2a1/0x650 block/genhd.c:1387 __blk_alloc_disk+0x37/0x90 block/genhd.c:1426 brd_alloc.part.0+0x281/0x7a0 drivers/block/brd.c:397 brd_alloc drivers/block/brd.c:517 [inline] brd_init+0x1b5/0x2a0 drivers/block/brd.c:484 do_one_initcall+0x141/0x7d0 init/main.c:1306 page_owner free stack trace missing Memory state around the buggy address: ffff888144edd900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888144edd980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888144edda00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888144edda80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888144eddb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================