2097051 pages RAM 0 pages HighMem/MovableOnly 369649 pages reserved 0 pages cma reserved ================================================================== BUG: KASAN: use-after-free in tcf_block_put+0xf6/0x100 net/sched/cls_api.c:797 Read of size 8 at addr ffff8880b2bab260 by task syz-executor.2/21222 CPU: 0 PID: 21222 Comm: syz-executor.2 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354 kasan_report mm/kasan/report.c:412 [inline] __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433 tcf_block_put+0xf6/0x100 net/sched/cls_api.c:797 cake_destroy+0x3f/0x80 net/sched/sch_cake.c:2634 qdisc_create+0xb70/0x1130 net/sched/sch_api.c:1204 tc_modify_qdisc+0xb0f/0x1a80 net/sched/sch_api.c:1555 rtnetlink_rcv_msg+0x453/0xb80 net/core/rtnetlink.c:4782 netlink_rcv_skb+0x160/0x440 net/netlink/af_netlink.c:2463 netlink_unicast_kernel net/netlink/af_netlink.c:1325 [inline] netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1351 netlink_sendmsg+0x6c3/0xc50 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:661 ___sys_sendmsg+0x7bb/0x8e0 net/socket.c:2227 __sys_sendmsg net/socket.c:2265 [inline] __do_sys_sendmsg net/socket.c:2274 [inline] __se_sys_sendmsg net/socket.c:2272 [inline] __x64_sys_sendmsg+0x132/0x220 net/socket.c:2272 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fe1eec3c0c9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe1ed18d168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fe1eed5c050 RCX: 00007fe1eec3c0c9 RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000004 RBP: 00007fe1ed18d1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007fff7a44427f R14: 00007fe1ed18d300 R15: 0000000000022000 Allocated by task 21222: kmem_cache_alloc_trace+0x12f/0x380 mm/slab.c:3625 kmalloc include/linux/slab.h:515 [inline] kzalloc include/linux/slab.h:709 [inline] tcf_block_create net/sched/cls_api.c:505 [inline] tcf_block_get_ext+0x26a/0x13b0 net/sched/cls_api.c:680 tcf_block_get+0xa9/0xf0 net/sched/cls_api.c:742 cake_init+0x2c9/0xb50 net/sched/sch_cake.c:2667 qdisc_create+0x579/0x1130 net/sched/sch_api.c:1156 tc_modify_qdisc+0xb0f/0x1a80 net/sched/sch_api.c:1555 rtnetlink_rcv_msg+0x453/0xb80 net/core/rtnetlink.c:4782 netlink_rcv_skb+0x160/0x440 net/netlink/af_netlink.c:2463 netlink_unicast_kernel net/netlink/af_netlink.c:1325 [inline] netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1351 netlink_sendmsg+0x6c3/0xc50 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:661 ___sys_sendmsg+0x7bb/0x8e0 net/socket.c:2227 __sys_sendmsg net/socket.c:2265 [inline] __do_sys_sendmsg net/socket.c:2274 [inline] __se_sys_sendmsg net/socket.c:2272 [inline] __x64_sys_sendmsg+0x132/0x220 net/socket.c:2272 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 21222: __cache_free mm/slab.c:3503 [inline] kfree+0xcc/0x210 mm/slab.c:3822 tcf_block_put_ext.part.0+0x5a1/0x6e0 net/sched/cls_api.c:784 tcf_block_put_ext net/sched/cls_api.c:754 [inline] tcf_block_put+0xad/0x100 net/sched/cls_api.c:797 cake_destroy net/sched/sch_cake.c:2634 [inline] cake_init+0xa9a/0xb50 net/sched/sch_cake.c:2710 qdisc_create+0x579/0x1130 net/sched/sch_api.c:1156 tc_modify_qdisc+0xb0f/0x1a80 net/sched/sch_api.c:1555 rtnetlink_rcv_msg+0x453/0xb80 net/core/rtnetlink.c:4782 netlink_rcv_skb+0x160/0x440 net/netlink/af_netlink.c:2463 netlink_unicast_kernel net/netlink/af_netlink.c:1325 [inline] netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1351 netlink_sendmsg+0x6c3/0xc50 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:661 ___sys_sendmsg+0x7bb/0x8e0 net/socket.c:2227 __sys_sendmsg net/socket.c:2265 [inline] __do_sys_sendmsg net/socket.c:2274 [inline] __se_sys_sendmsg net/socket.c:2272 [inline] __x64_sys_sendmsg+0x132/0x220 net/socket.c:2272 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 ffff8880b2bab240 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 32 bytes inside of 128-byte region [ffff8880b2bab240, ffff8880b2bab2c0) The buggy address belongs to the page: page:ffffea0002caeac0 count:1 mapcount:0 mapping:ffff88813bff0640 index:0x0 flags: 0xfff00000000100(slab) raw: 00fff00000000100 ffffea0002c9cc48 ffffea0002c03ac8 ffff88813bff0640 raw: 0000000000000000 ffff8880b2bab000 0000000100000015 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880b2bab100: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ffff8880b2bab180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc >ffff8880b2bab200: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff8880b2bab280: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8880b2bab300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================