================================================================== BUG: KASAN: use-after-free in mini_qdisc_pair_swap+0x1b9/0x1f0 net/sched/sch_generic.c:1576 Write of size 8 at addr ffff888078a34308 by task syz-executor.4/5631 CPU: 1 PID: 5631 Comm: syz-executor.4 Not tainted 5.18.0-syzkaller-10643-g9d004b2f4fea #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+0xeb/0x495 mm/kasan/report.c:313 print_report mm/kasan/report.c:429 [inline] kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491 mini_qdisc_pair_swap+0x1b9/0x1f0 net/sched/sch_generic.c:1576 tcf_chain_head_change_item net/sched/cls_api.c:389 [inline] tcf_chain0_head_change.isra.0+0xb9/0x120 net/sched/cls_api.c:403 tcf_chain_tp_insert net/sched/cls_api.c:1677 [inline] tcf_chain_tp_insert_unique net/sched/cls_api.c:1726 [inline] tc_new_tfilter+0x1d5b/0x2200 net/sched/cls_api.c:2107 rtnetlink_rcv_msg+0x946/0xc90 net/core/rtnetlink.c:6080 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2501 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x543/0x7f0 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x917/0xe10 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:734 ____sys_sendmsg+0x334/0x810 net/socket.c:2492 ___sys_sendmsg+0xf3/0x170 net/socket.c:2546 __sys_sendmmsg+0x195/0x470 net/socket.c:2632 __do_sys_sendmmsg net/socket.c:2661 [inline] __se_sys_sendmmsg net/socket.c:2658 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2658 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+0x46/0xb0 RIP: 0033:0x7fddb8689109 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fddb75bc168 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007fddb879c100 RCX: 00007fddb8689109 RDX: 040000000000009f RSI: 00000000200002c0 RDI: 0000000000000006 RBP: 00007fddb86e308d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fddb8ccfb1f R14: 00007fddb75bc300 R15: 0000000000022000 Allocated by task 5628: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc mm/kasan/common.c:515 [inline] ____kasan_kmalloc mm/kasan/common.c:474 [inline] __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:524 kmalloc_node include/linux/slab.h:623 [inline] kzalloc_node include/linux/slab.h:744 [inline] qdisc_alloc+0xac/0xa10 net/sched/sch_generic.c:941 qdisc_create.constprop.0+0xce/0x10f0 net/sched/sch_api.c:1211 tc_modify_qdisc+0x4c5/0x1a00 net/sched/sch_api.c:1660 rtnetlink_rcv_msg+0x43a/0xc90 net/core/rtnetlink.c:6089 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2501 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x543/0x7f0 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x917/0xe10 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:734 ____sys_sendmsg+0x334/0x810 net/socket.c:2492 ___sys_sendmsg+0xf3/0x170 net/socket.c:2546 __sys_sendmmsg+0x195/0x470 net/socket.c:2632 __do_sys_sendmmsg net/socket.c:2661 [inline] __se_sys_sendmmsg net/socket.c:2658 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2658 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+0x46/0xb0 Freed by task 15: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free+0x166/0x1a0 mm/kasan/common.c:328 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1727 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1753 slab_free mm/slub.c:3507 [inline] kfree+0xd6/0x4d0 mm/slub.c:4555 rcu_do_batch kernel/rcu/tree.c:2578 [inline] rcu_core+0x7b1/0x1880 kernel/rcu/tree.c:2838 __do_softirq+0x29b/0x9c2 kernel/softirq.c:571 Last potentially related work creation: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 __kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348 call_rcu+0x99/0x790 kernel/rcu/tree.c:3126 qdisc_put_unlocked+0x6f/0x90 net/sched/sch_generic.c:1101 tcf_block_release+0x86/0x90 net/sched/cls_api.c:1255 tc_new_tfilter+0xa46/0x2200 net/sched/cls_api.c:2169 rtnetlink_rcv_msg+0x946/0xc90 net/core/rtnetlink.c:6080 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2501 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x543/0x7f0 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x917/0xe10 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:734 ____sys_sendmsg+0x334/0x810 net/socket.c:2492 ___sys_sendmsg+0xf3/0x170 net/socket.c:2546 __sys_sendmmsg+0x195/0x470 net/socket.c:2632 __do_sys_sendmmsg net/socket.c:2661 [inline] __se_sys_sendmmsg net/socket.c:2658 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2658 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+0x46/0xb0 The buggy address belongs to the object at ffff888078a34000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 776 bytes inside of 1024-byte region [ffff888078a34000, ffff888078a34400) The buggy address belongs to the physical page: page:ffffea0001e28c00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x78a30 head:ffffea0001e28c00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000001 ffff888010c41dc0 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 0, tgid 0 (swapper/1), ts 55035937315, free_ts 55034949555 prep_new_page mm/page_alloc.c:2456 [inline] get_page_from_freelist+0x1290/0x3b70 mm/page_alloc.c:4198 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5426 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2272 alloc_slab_page mm/slub.c:1797 [inline] allocate_slab+0x26c/0x3c0 mm/slub.c:1942 new_slab mm/slub.c:2002 [inline] ___slab_alloc+0x985/0xd90 mm/slub.c:3002 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3089 slab_alloc_node mm/slub.c:3180 [inline] __kmalloc_node_track_caller+0x2cb/0x360 mm/slub.c:4950 kmalloc_reserve net/core/skbuff.c:354 [inline] __alloc_skb+0xde/0x340 net/core/skbuff.c:426 alloc_skb include/linux/skbuff.h:1426 [inline] __tcp_send_ack.part.0+0x67/0x760 net/ipv4/tcp_output.c:3947 __tcp_send_ack net/ipv4/tcp_output.c:3979 [inline] tcp_send_ack+0x7d/0xa0 net/ipv4/tcp_output.c:3979 __tcp_ack_snd_check+0x156/0x9c0 net/ipv4/tcp_input.c:5504 tcp_rcv_established+0x1909/0x20e0 net/ipv4/tcp_input.c:5947 tcp_v4_do_rcv+0x66c/0x980 net/ipv4/tcp_ipv4.c:1659 tcp_v4_rcv+0x2ee8/0x36b0 net/ipv4/tcp_ipv4.c:2072 ip_protocol_deliver_rcu+0xa3/0x7c0 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x2dc/0x4b0 net/ipv4/ip_input.c:233 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1371 [inline] free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1421 free_unref_page_prepare mm/page_alloc.c:3343 [inline] free_unref_page+0x19/0x6a0 mm/page_alloc.c:3438 skb_free_frag include/linux/skbuff.h:3285 [inline] skb_free_head+0x96/0x110 net/core/skbuff.c:653 skb_release_data+0x67a/0x810 net/core/skbuff.c:677 skb_release_all net/core/skbuff.c:742 [inline] __kfree_skb net/core/skbuff.c:756 [inline] skb_attempt_defer_free+0x31c/0x400 net/core/skbuff.c:6506 tcp_eat_recv_skb net/ipv4/tcp.c:1598 [inline] tcp_recvmsg_locked+0x1116/0x22b0 net/ipv4/tcp.c:2508 tcp_recvmsg+0x112/0x620 net/ipv4/tcp.c:2554 inet_recvmsg+0x115/0x5e0 net/ipv4/af_inet.c:850 sock_recvmsg_nosec net/socket.c:995 [inline] sock_recvmsg net/socket.c:1013 [inline] sock_recvmsg net/socket.c:1009 [inline] sock_read_iter+0x337/0x470 net/socket.c:1086 call_read_iter include/linux/fs.h:2054 [inline] new_sync_read+0x4f9/0x5f0 fs/read_write.c:401 vfs_read+0x492/0x5d0 fs/read_write.c:482 ksys_read+0x1e8/0x250 fs/read_write.c:620 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+0x46/0xb0 Memory state around the buggy address: ffff888078a34200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888078a34280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888078a34300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888078a34380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888078a34400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================