================================================================== BUG: KASAN: slab-use-after-free in mini_qdisc_pair_swap+0x140/0x164 net/sched/sch_generic.c:1573 Write of size 8 at addr ffff0000d6e1c308 by task syz-executor.1/6323 CPU: 0 PID: 6323 Comm: syz-executor.1 Not tainted 6.3.0-rc7-syzkaller-g14f8db1c0f9a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233 show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:319 [inline] print_report+0x174/0x514 mm/kasan/report.c:430 kasan_report+0xd4/0x130 mm/kasan/report.c:536 __asan_report_store8_noabort+0x20/0x2c mm/kasan/report_generic.c:386 mini_qdisc_pair_swap+0x140/0x164 net/sched/sch_generic.c:1573 clsact_chain_head_change+0x28/0x38 net/sched/sch_ingress.c:59 tcf_chain_head_change_item net/sched/cls_api.c:495 [inline] tcf_chain0_head_change net/sched/cls_api.c:509 [inline] tcf_chain_tp_insert net/sched/cls_api.c:1826 [inline] tcf_chain_tp_insert_unique+0x9b0/0xb48 net/sched/cls_api.c:1875 tc_new_tfilter+0x1208/0x1614 net/sched/cls_api.c:2266 rtnetlink_rcv_msg+0x780/0xdb8 net/core/rtnetlink.c:6172 netlink_rcv_skb+0x214/0x3c4 net/netlink/af_netlink.c:2577 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6199 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline] netlink_unicast+0x660/0x8d4 net/netlink/af_netlink.c:1365 netlink_sendmsg+0x834/0xb18 net/netlink/af_netlink.c:1942 sock_sendmsg_nosec net/socket.c:724 [inline] sock_sendmsg net/socket.c:747 [inline] ____sys_sendmsg+0x568/0x81c net/socket.c:2501 ___sys_sendmsg net/socket.c:2555 [inline] __sys_sendmmsg+0x318/0x7d8 net/socket.c:2641 __do_sys_sendmmsg net/socket.c:2670 [inline] __se_sys_sendmmsg net/socket.c:2667 [inline] __arm64_sys_sendmmsg+0xa0/0xbc net/socket.c:2667 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:193 el0_svc+0x4c/0x15c arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 Allocated by task 6316: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x7c mm/kasan/common.c:52 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:510 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:196 [inline] __do_kmalloc_node mm/slab_common.c:967 [inline] __kmalloc_node+0xd4/0x1c4 mm/slab_common.c:974 kmalloc_node include/linux/slab.h:610 [inline] kzalloc_node include/linux/slab.h:731 [inline] qdisc_alloc+0x90/0x75c net/sched/sch_generic.c:938 qdisc_create+0x158/0xda8 net/sched/sch_api.c:1244 tc_modify_qdisc+0x940/0x1698 rtnetlink_rcv_msg+0x744/0xdb8 net/core/rtnetlink.c:6181 netlink_rcv_skb+0x214/0x3c4 net/netlink/af_netlink.c:2577 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6199 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline] netlink_unicast+0x660/0x8d4 net/netlink/af_netlink.c:1365 netlink_sendmsg+0x834/0xb18 net/netlink/af_netlink.c:1942 sock_sendmsg_nosec net/socket.c:724 [inline] sock_sendmsg net/socket.c:747 [inline] ____sys_sendmsg+0x568/0x81c net/socket.c:2501 ___sys_sendmsg net/socket.c:2555 [inline] __sys_sendmmsg+0x318/0x7d8 net/socket.c:2641 __do_sys_sendmmsg net/socket.c:2670 [inline] __se_sys_sendmmsg net/socket.c:2667 [inline] __arm64_sys_sendmmsg+0xa0/0xbc net/socket.c:2667 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:193 el0_svc+0x4c/0x15c arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 Freed by task 15: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x7c mm/kasan/common.c:52 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:521 ____kasan_slab_free+0x144/0x1c0 mm/kasan/common.c:236 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:244 kasan_slab_free include/linux/kasan.h:162 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook mm/slub.c:1807 [inline] slab_free mm/slub.c:3787 [inline] __kmem_cache_free+0x2a8/0x49c mm/slub.c:3800 kfree+0xb8/0x19c mm/slab_common.c:1019 qdisc_free net/sched/sch_generic.c:1039 [inline] qdisc_free_cb+0xac/0xcc net/sched/sch_generic.c:1046 rcu_do_batch kernel/rcu/tree.c:2112 [inline] rcu_core+0x800/0x1aa4 kernel/rcu/tree.c:2372 rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2389 __do_softirq+0x2d0/0xd54 kernel/softirq.c:571 Last potentially related work creation: kasan_save_stack+0x40/0x6c mm/kasan/common.c:45 __kasan_record_aux_stack+0xcc/0xe8 mm/kasan/generic.c:491 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:501 __call_rcu_common kernel/rcu/tree.c:2622 [inline] call_rcu+0x104/0xaf4 kernel/rcu/tree.c:2736 qdisc_destroy+0x284/0x4b8 net/sched/sch_generic.c:1070 qdisc_put_unlocked+0x70/0xac net/sched/sch_generic.c:1097 tcf_block_release net/sched/cls_api.c:1362 [inline] tc_new_tfilter+0x210/0x1614 net/sched/cls_api.c:2331 rtnetlink_rcv_msg+0x780/0xdb8 net/core/rtnetlink.c:6172 netlink_rcv_skb+0x214/0x3c4 net/netlink/af_netlink.c:2577 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6199 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline] netlink_unicast+0x660/0x8d4 net/netlink/af_netlink.c:1365 netlink_sendmsg+0x834/0xb18 net/netlink/af_netlink.c:1942 sock_sendmsg_nosec net/socket.c:724 [inline] sock_sendmsg net/socket.c:747 [inline] ____sys_sendmsg+0x568/0x81c net/socket.c:2501 ___sys_sendmsg net/socket.c:2555 [inline] __sys_sendmmsg+0x318/0x7d8 net/socket.c:2641 __do_sys_sendmmsg net/socket.c:2670 [inline] __se_sys_sendmmsg net/socket.c:2667 [inline] __arm64_sys_sendmmsg+0xa0/0xbc net/socket.c:2667 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:193 el0_svc+0x4c/0x15c arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 The buggy address belongs to the object at ffff0000d6e1c000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 776 bytes inside of freed 1024-byte region [ffff0000d6e1c000, ffff0000d6e1c400) The buggy address belongs to the physical page: page:000000000d801f17 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x116e18 head:000000000d801f17 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 ffff0000c0002780 fffffc00034ad000 dead000000000002 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000d6e1c200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d6e1c280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000d6e1c300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000d6e1c380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d6e1c400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================