================================================================== BUG: KASAN: slab-use-after-free in taprio_dump_tc_entries net/sched/sch_taprio.c:2306 [inline] BUG: KASAN: slab-use-after-free in taprio_dump+0xb8c/0xca0 net/sched/sch_taprio.c:2420 Read of size 4 at addr ffff888066e150c0 by task syz-executor.0/26552 CPU: 1 PID: 26552 Comm: syz-executor.0 Not tainted 6.8.0-rc7-syzkaller-00051-g67be068d31d4 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc4/0x620 mm/kasan/report.c:488 kasan_report+0xda/0x110 mm/kasan/report.c:601 taprio_dump_tc_entries net/sched/sch_taprio.c:2306 [inline] taprio_dump+0xb8c/0xca0 net/sched/sch_taprio.c:2420 tc_fill_qdisc+0x633/0x12f0 net/sched/sch_api.c:952 qdisc_notify.isra.0+0x367/0x3f0 net/sched/sch_api.c:1053 tc_modify_qdisc+0x91e/0x1c40 net/sched/sch_api.c:1748 rtnetlink_rcv_msg+0x3c7/0xe10 net/core/rtnetlink.c:6617 netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2543 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline] netlink_unicast+0x542/0x820 net/netlink/af_netlink.c:1367 netlink_sendmsg+0x8bb/0xd70 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0xab5/0xc90 net/socket.c:2584 ___sys_sendmsg+0x135/0x1e0 net/socket.c:2638 __sys_sendmsg+0x117/0x1f0 net/socket.c:2667 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd5/0x270 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7f423567dda9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f42364730c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f42357abf80 RCX: 00007f423567dda9 RDX: 0000000000000000 RSI: 00000000200007c0 RDI: 0000000000000004 RBP: 00007f42356ca47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f42357abf80 R15: 00007ffe003a38a8 Allocated by task 26544: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387 kmalloc include/linux/slab.h:590 [inline] kzalloc include/linux/slab.h:711 [inline] taprio_change+0x55e/0x38e0 net/sched/sch_taprio.c:1881 taprio_init+0x6b1/0x940 net/sched/sch_taprio.c:2134 qdisc_create+0x4f3/0x10b0 net/sched/sch_api.c:1355 tc_modify_qdisc+0x4d8/0x1c40 net/sched/sch_api.c:1776 rtnetlink_rcv_msg+0x3c7/0xe10 net/core/rtnetlink.c:6617 netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2543 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline] netlink_unicast+0x542/0x820 net/netlink/af_netlink.c:1367 netlink_sendmsg+0x8bb/0xd70 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0xab5/0xc90 net/socket.c:2584 ___sys_sendmsg+0x135/0x1e0 net/socket.c:2638 __sys_sendmsg+0x117/0x1f0 net/socket.c:2667 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd5/0x270 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6f/0x77 Freed by task 22: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:589 poison_slab_object mm/kasan/common.c:240 [inline] __kasan_slab_free+0x11d/0x1a0 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2121 [inline] slab_free mm/slub.c:4299 [inline] kfree+0x124/0x370 mm/slub.c:4409 rcu_do_batch kernel/rcu/tree.c:2190 [inline] rcu_core+0x819/0x1680 kernel/rcu/tree.c:2465 __do_softirq+0x21c/0x8e7 kernel/softirq.c:553 Last potentially related work creation: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xba/0xd0 mm/kasan/generic.c:551 __call_rcu_common.constprop.0+0x9a/0x7c0 kernel/rcu/tree.c:2715 taprio_change+0x2905/0x38e0 net/sched/sch_taprio.c:1991 qdisc_change net/sched/sch_api.c:1416 [inline] tc_modify_qdisc+0x7dc/0x1c40 net/sched/sch_api.c:1746 rtnetlink_rcv_msg+0x3c7/0xe10 net/core/rtnetlink.c:6617 netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2543 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline] netlink_unicast+0x542/0x820 net/netlink/af_netlink.c:1367 netlink_sendmsg+0x8bb/0xd70 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0xab5/0xc90 net/socket.c:2584 ___sys_sendmsg+0x135/0x1e0 net/socket.c:2638 __sys_sendmsg+0x117/0x1f0 net/socket.c:2667 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd5/0x270 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6f/0x77 The buggy address belongs to the object at ffff888066e15000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 192 bytes inside of freed 512-byte region [ffff888066e15000, ffff888066e15200) The buggy address belongs to the physical page: page:ffffea00019b8500 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x66e14 head:ffffea00019b8500 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888014c41c80 0000000000000000 dead000000000001 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5095, tgid 5095 (syz-executor.1), ts 140563945428, free_ts 140456538549 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2d4/0x350 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3311 __alloc_pages+0x22f/0x2440 mm/page_alloc.c:4567 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page mm/slub.c:2190 [inline] allocate_slab mm/slub.c:2354 [inline] new_slab+0xcc/0x3a0 mm/slub.c:2407 ___slab_alloc+0x4af/0x19a0 mm/slub.c:3540 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3625 __slab_alloc_node mm/slub.c:3678 [inline] slab_alloc_node mm/slub.c:3850 [inline] kmalloc_trace+0x30b/0x340 mm/slub.c:4007 kmalloc include/linux/slab.h:590 [inline] kzalloc include/linux/slab.h:711 [inline] device_private_init drivers/base/core.c:3484 [inline] device_add+0xd0c/0x1ab0 drivers/base/core.c:3535 netdev_register_kobject+0x187/0x3f0 net/core/net-sysfs.c:2055 register_netdevice+0x12c0/0x1cd0 net/core/dev.c:10261 rtnl_newlink_create net/core/rtnetlink.c:3520 [inline] __rtnl_newlink+0x1632/0x1960 net/core/rtnetlink.c:3738 rtnl_newlink+0x67/0xa0 net/core/rtnetlink.c:3751 rtnetlink_rcv_msg+0x3c7/0xe10 net/core/rtnetlink.c:6617 netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2543 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline] netlink_unicast+0x542/0x820 net/netlink/af_netlink.c:1367 netlink_sendmsg+0x8bb/0xd70 net/netlink/af_netlink.c:1908 page last free pid 5095 tgid 5095 stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1140 [inline] free_unref_page_prepare+0x527/0xb10 mm/page_alloc.c:2346 free_unref_page+0x33/0x3c0 mm/page_alloc.c:2486 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4e/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x192/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3813 [inline] slab_alloc_node mm/slub.c:3860 [inline] kmem_cache_alloc_node+0x177/0x350 mm/slub.c:3903 __alloc_skb+0x28b/0x330 net/core/skbuff.c:641 alloc_skb include/linux/skbuff.h:1296 [inline] netlink_alloc_large_skb+0x4d/0xf0 net/netlink/af_netlink.c:1213 netlink_sendmsg+0x68c/0xd70 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] __sys_sendto+0x47f/0x4e0 net/socket.c:2191 __do_sys_sendto net/socket.c:2203 [inline] __se_sys_sendto net/socket.c:2199 [inline] __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2199 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd5/0x270 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6f/0x77 Memory state around the buggy address: ffff888066e14f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888066e15000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888066e15080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888066e15100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888066e15180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================