================================================================== BUG: KASAN: use-after-free in dump_schedule+0x68e/0x6f0 net/sched/sch_taprio.c:1849 Read of size 8 at addr ffff88801528cac0 by task syz-executor.2/28521 CPU: 1 PID: 28521 Comm: syz-executor.2 Not tainted 5.18.0-rc3-syzkaller #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+0x57/0x7d 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 dump_schedule+0x68e/0x6f0 net/sched/sch_taprio.c:1849 taprio_dump+0x431/0xb70 net/sched/sch_taprio.c:1918 tc_fill_qdisc+0x570/0xf60 net/sched/sch_api.c:924 qdisc_notify.isra.0+0x22e/0x2a0 net/sched/sch_api.c:990 tc_modify_qdisc+0xc4d/0x1680 net/sched/sch_api.c:1633 rtnetlink_rcv_msg+0x31d/0x8d0 net/core/rtnetlink.c:5993 netlink_rcv_skb+0x118/0x370 net/netlink/af_netlink.c:2496 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x433/0x710 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x770/0xc20 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xab/0xe0 net/socket.c:725 sock_no_sendpage+0xea/0x130 net/core/sock.c:3106 kernel_sendpage.part.0+0x151/0x550 net/socket.c:3492 kernel_sendpage net/socket.c:3489 [inline] sock_sendpage+0xbd/0x190 net/socket.c:1007 pipe_to_sendpage+0x245/0x410 fs/splice.c:364 splice_from_pipe_feed fs/splice.c:418 [inline] __splice_from_pipe+0x362/0x810 fs/splice.c:562 splice_from_pipe fs/splice.c:597 [inline] generic_splice_sendpage+0xba/0x120 fs/splice.c:746 do_splice_from fs/splice.c:767 [inline] do_splice+0x9c8/0x1b00 fs/splice.c:1079 __do_splice+0xf4/0x1b0 fs/splice.c:1144 __do_sys_splice fs/splice.c:1350 [inline] __se_sys_splice fs/splice.c:1332 [inline] __x64_sys_splice+0x14a/0x200 fs/splice.c:1332 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fe1c6c88a39 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe1c7df6188 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 00007fe1c6d8bf60 RCX: 00007fe1c6c88a39 RDX: 0000000000000004 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007fe1c6ce2e8f R08: 0000000000010976 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe1c72bfb2f R14: 00007fe1c7df6300 R15: 0000000000022000 Allocated by task 28501: 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 include/linux/slab.h:581 [inline] kzalloc include/linux/slab.h:714 [inline] taprio_change+0x51b/0x3a80 net/sched/sch_taprio.c:1485 qdisc_change net/sched/sch_api.c:1329 [inline] tc_modify_qdisc+0xafd/0x1680 net/sched/sch_api.c:1631 rtnetlink_rcv_msg+0x31d/0x8d0 net/core/rtnetlink.c:5993 netlink_rcv_skb+0x118/0x370 net/netlink/af_netlink.c:2496 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x433/0x710 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x770/0xc20 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xab/0xe0 net/socket.c:725 sock_no_sendpage+0xea/0x130 net/core/sock.c:3106 kernel_sendpage.part.0+0x151/0x550 net/socket.c:3492 kernel_sendpage net/socket.c:3489 [inline] sock_sendpage+0xbd/0x190 net/socket.c:1007 pipe_to_sendpage+0x245/0x410 fs/splice.c:364 splice_from_pipe_feed fs/splice.c:418 [inline] __splice_from_pipe+0x362/0x810 fs/splice.c:562 splice_from_pipe fs/splice.c:597 [inline] generic_splice_sendpage+0xba/0x120 fs/splice.c:746 do_splice_from fs/splice.c:767 [inline] do_splice+0x9c8/0x1b00 fs/splice.c:1079 __do_splice+0xf4/0x1b0 fs/splice.c:1144 __do_sys_splice fs/splice.c:1350 [inline] __se_sys_splice fs/splice.c:1332 [inline] __x64_sys_splice+0x14a/0x200 fs/splice.c:1332 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 3933: 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:1728 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1754 slab_free mm/slub.c:3510 [inline] kfree+0xd6/0x4d0 mm/slub.c:4552 rcu_do_batch kernel/rcu/tree.c:2535 [inline] rcu_core+0x7b1/0x1880 kernel/rcu/tree.c:2786 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 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:3074 taprio_change+0x259a/0x3a80 net/sched/sch_taprio.c:1605 qdisc_change net/sched/sch_api.c:1329 [inline] tc_modify_qdisc+0xafd/0x1680 net/sched/sch_api.c:1631 rtnetlink_rcv_msg+0x31d/0x8d0 net/core/rtnetlink.c:5993 netlink_rcv_skb+0x118/0x370 net/netlink/af_netlink.c:2496 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x433/0x710 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x770/0xc20 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xab/0xe0 net/socket.c:725 sock_no_sendpage+0xea/0x130 net/core/sock.c:3106 kernel_sendpage.part.0+0x151/0x550 net/socket.c:3492 kernel_sendpage net/socket.c:3489 [inline] sock_sendpage+0xbd/0x190 net/socket.c:1007 pipe_to_sendpage+0x245/0x410 fs/splice.c:364 splice_from_pipe_feed fs/splice.c:418 [inline] __splice_from_pipe+0x362/0x810 fs/splice.c:562 splice_from_pipe fs/splice.c:597 [inline] generic_splice_sendpage+0xba/0x120 fs/splice.c:746 do_splice_from fs/splice.c:767 [inline] do_splice+0x9c8/0x1b00 fs/splice.c:1079 __do_splice+0xf4/0x1b0 fs/splice.c:1144 __do_sys_splice fs/splice.c:1350 [inline] __se_sys_splice fs/splice.c:1332 [inline] __x64_sys_splice+0x14a/0x200 fs/splice.c:1332 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Second to 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:3074 taprio_change+0x259a/0x3a80 net/sched/sch_taprio.c:1605 qdisc_change net/sched/sch_api.c:1329 [inline] tc_modify_qdisc+0xafd/0x1680 net/sched/sch_api.c:1631 rtnetlink_rcv_msg+0x31d/0x8d0 net/core/rtnetlink.c:5993 netlink_rcv_skb+0x118/0x370 net/netlink/af_netlink.c:2496 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x433/0x710 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x770/0xc20 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xab/0xe0 net/socket.c:725 sock_no_sendpage+0xea/0x130 net/core/sock.c:3106 kernel_sendpage.part.0+0x151/0x550 net/socket.c:3492 kernel_sendpage net/socket.c:3489 [inline] sock_sendpage+0xbd/0x190 net/socket.c:1007 pipe_to_sendpage+0x245/0x410 fs/splice.c:364 splice_from_pipe_feed fs/splice.c:418 [inline] __splice_from_pipe+0x362/0x810 fs/splice.c:562 splice_from_pipe fs/splice.c:597 [inline] generic_splice_sendpage+0xba/0x120 fs/splice.c:746 do_splice_from fs/splice.c:767 [inline] do_splice+0x9c8/0x1b00 fs/splice.c:1079 __do_splice+0xf4/0x1b0 fs/splice.c:1144 __do_sys_splice fs/splice.c:1350 [inline] __se_sys_splice fs/splice.c:1332 [inline] __x64_sys_splice+0x14a/0x200 fs/splice.c:1332 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff88801528ca80 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 64 bytes inside of 96-byte region [ffff88801528ca80, ffff88801528cae0) The buggy address belongs to the physical page: page:ffffea000054a300 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1528c flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 dead000000000100 dead000000000122 ffff88800fc41780 raw: 0000000000000000 0000000000200020 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY), pid 3006, tgid 3006 (udevd), ts 10647853916, free_ts 10643012783 prep_new_page mm/page_alloc.c:2441 [inline] get_page_from_freelist+0x178d/0x3dc0 mm/page_alloc.c:4182 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5408 alloc_slab_page mm/slub.c:1799 [inline] allocate_slab+0x26c/0x3c0 mm/slub.c:1944 new_slab mm/slub.c:2004 [inline] ___slab_alloc+0x8e1/0xf20 mm/slub.c:3005 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3092 slab_alloc_node mm/slub.c:3183 [inline] slab_alloc mm/slub.c:3225 [inline] __kmalloc+0x318/0x350 mm/slub.c:4410 kmalloc include/linux/slab.h:586 [inline] kzalloc include/linux/slab.h:714 [inline] tomoyo_encode2.part.0+0x92/0x310 security/tomoyo/realpath.c:45 tomoyo_realpath_from_path+0x140/0x6a0 security/tomoyo/realpath.c:288 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_check_open_permission+0x21c/0x2c0 security/tomoyo/file.c:771 security_file_open+0x34/0x80 security/security.c:1651 do_dentry_open+0x300/0xfd0 fs/open.c:811 do_open fs/namei.c:3476 [inline] path_openat+0x9cf/0x2360 fs/namei.c:3609 do_filp_open+0x199/0x3d0 fs/namei.c:3636 do_sys_openat2+0x11e/0x3f0 fs/open.c:1213 do_sys_open fs/open.c:1229 [inline] __do_sys_openat fs/open.c:1245 [inline] __se_sys_openat fs/open.c:1240 [inline] __x64_sys_openat+0x11b/0x1d0 fs/open.c:1240 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1356 [inline] free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1406 free_unref_page_prepare mm/page_alloc.c:3328 [inline] free_unref_page+0x19/0x6a0 mm/page_alloc.c:3423 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2523 qlink_free mm/kasan/quarantine.c:157 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:446 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:749 [inline] slab_alloc_node mm/slub.c:3217 [inline] slab_alloc mm/slub.c:3225 [inline] __kmem_cache_alloc_lru mm/slub.c:3232 [inline] kmem_cache_alloc+0x204/0x3b0 mm/slub.c:3242 getname_flags.part.0+0x4a/0x440 fs/namei.c:138 do_sys_openat2+0xd2/0x3f0 fs/open.c:1207 do_sys_open fs/open.c:1229 [inline] __do_sys_openat fs/open.c:1245 [inline] __se_sys_openat fs/open.c:1240 [inline] __x64_sys_openat+0x11b/0x1d0 fs/open.c:1240 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Memory state around the buggy address: ffff88801528c980: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ffff88801528ca00: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc >ffff88801528ca80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff88801528cb00: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ffff88801528cb80: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ==================================================================