netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'. ================================================================== BUG: KASAN: use-after-free in qdisc_dev include/net/sch_generic.h:472 [inline] BUG: KASAN: use-after-free in tc_chain_fill_node+0x7f5/0x860 net/sched/cls_api.c:1733 Read of size 8 at addr ffff88804ec420c0 by task syz-executor.2/22395 CPU: 0 PID: 22395 Comm: syz-executor.2 Not tainted 4.19.166-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2fe lib/dump_stack.c:118 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256 kasan_report_error.cold+0x8a/0x1c7 mm/kasan/report.c:354 kasan_report mm/kasan/report.c:412 [inline] __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433 qdisc_dev include/net/sch_generic.h:472 [inline] tc_chain_fill_node+0x7f5/0x860 net/sched/cls_api.c:1733 tc_chain_notify+0x100/0x1f0 net/sched/cls_api.c:1771 __tcf_chain_put+0xe5/0x4b0 net/sched/cls_api.c:330 tcf_chain_put net/sched/cls_api.c:340 [inline] tc_new_tfilter+0x729/0x16c0 net/sched/cls_api.c:1338 rtnetlink_rcv_msg+0x453/0xb80 net/core/rtnetlink.c:4778 netlink_rcv_skb+0x160/0x440 net/netlink/af_netlink.c:2455 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x6bb/0xc40 net/netlink/af_netlink.c:1909 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:632 ___sys_sendmsg+0x3b3/0x8e0 net/socket.c:2115 __sys_sendmmsg+0x195/0x470 net/socket.c:2210 __do_sys_sendmmsg net/socket.c:2239 [inline] __se_sys_sendmmsg net/socket.c:2236 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2236 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45e219 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f4dc469ec68 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045e219 RDX: 010efe10675dec16 RSI: 0000000020000200 RDI: 0000000000000005 RBP: 000000000119c070 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c034 R13: 00007ffe0c32269f R14: 00007f4dc469f9c0 R15: 000000000119c034 Allocated by task 22395: __do_kmalloc_node mm/slab.c:3689 [inline] __kmalloc_node+0x4c/0x70 mm/slab.c:3696 kmalloc_node include/linux/slab.h:557 [inline] kzalloc_node include/linux/slab.h:720 [inline] qdisc_alloc+0xb2/0xa40 net/sched/sch_generic.c:837 qdisc_create+0xdc/0x1130 net/sched/sch_api.c:1113 tc_modify_qdisc+0x50d/0x1a80 net/sched/sch_api.c:1571 rtnetlink_rcv_msg+0x453/0xb80 net/core/rtnetlink.c:4778 netlink_rcv_skb+0x160/0x440 net/netlink/af_netlink.c:2455 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x6bb/0xc40 net/netlink/af_netlink.c:1909 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:632 ___sys_sendmsg+0x3b3/0x8e0 net/socket.c:2115 __sys_sendmmsg+0x195/0x470 net/socket.c:2210 __do_sys_sendmmsg net/socket.c:2239 [inline] __se_sys_sendmmsg net/socket.c:2236 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2236 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 22413: __cache_free mm/slab.c:3503 [inline] kfree+0xcc/0x210 mm/slab.c:3822 qdisc_free net/sched/sch_generic.c:958 [inline] qdisc_destroy+0x501/0x790 net/sched/sch_generic.c:998 notify_and_destroy net/sched/sch_api.c:924 [inline] qdisc_graft+0xb61/0x1130 net/sched/sch_api.c:982 tc_modify_qdisc+0xd3d/0x1a80 net/sched/sch_api.c:1582 rtnetlink_rcv_msg+0x453/0xb80 net/core/rtnetlink.c:4778 netlink_rcv_skb+0x160/0x440 net/netlink/af_netlink.c:2455 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x6bb/0xc40 net/netlink/af_netlink.c:1909 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:632 ___sys_sendmsg+0x3b3/0x8e0 net/socket.c:2115 __sys_sendmmsg+0x195/0x470 net/socket.c:2210 __do_sys_sendmmsg net/socket.c:2239 [inline] __se_sys_sendmmsg net/socket.c:2236 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2236 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88804ec42080 which belongs to the cache kmalloc-2048 of size 2048 The buggy address is located 64 bytes inside of 2048-byte region [ffff88804ec42080, ffff88804ec42880) The buggy address belongs to the page: page:ffffea00013b1080 count:1 mapcount:0 mapping:ffff88813bff0c40 index:0x0 compound_mapcount: 0 flags: 0xfff00000008100(slab|head) raw: 00fff00000008100 ffffea0001461a88 ffffea0000bbed08 ffff88813bff0c40 raw: 0000000000000000 ffff88804ec42080 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88804ec41f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88804ec42000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88804ec42080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88804ec42100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88804ec42180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================