================================================================== BUG: KASAN: use-after-free in dump_schedule+0x6cd/0x730 net/sched/sch_taprio.c:1849 Read of size 8 at addr ffff88801c132c40 by task syz-executor.0/32108 CPU: 0 PID: 32108 Comm: syz-executor.0 Not tainted 5.19.0-rc8-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 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+0x6cd/0x730 net/sched/sch_taprio.c:1849 taprio_dump+0x43a/0xba0 net/sched/sch_taprio.c:1918 tc_fill_qdisc+0x57c/0xf90 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+0x32d/0x9a0 net/core/rtnetlink.c:6089 netlink_rcv_skb+0x118/0x370 net/netlink/af_netlink.c:2501 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x433/0x710 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x782/0xc30 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xab/0xe0 net/socket.c:734 sock_no_sendpage+0xf3/0x130 net/core/sock.c:3161 kernel_sendpage.part.0+0x151/0x550 net/socket.c:3567 kernel_sendpage net/socket.c:3564 [inline] sock_sendpage+0xbd/0x190 net/socket.c:1054 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+0x63/0xcd RIP: 0033:0x7fd43ba88a39 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:00007fd43cbe1188 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 00007fd43bb8bf60 RCX: 00007fd43ba88a39 RDX: 0000000000000004 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007fd43bae2e8f R08: 0000000000010976 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd43c0bfb2f R14: 00007fd43cbe1300 R15: 0000000000022000 Allocated by task 32096: 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:600 [inline] kzalloc include/linux/slab.h:733 [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+0x32d/0x9a0 net/core/rtnetlink.c:6089 netlink_rcv_skb+0x118/0x370 net/netlink/af_netlink.c:2501 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x433/0x710 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x782/0xc30 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xab/0xe0 net/socket.c:734 sock_no_sendpage+0xf3/0x130 net/core/sock.c:3161 kernel_sendpage.part.0+0x151/0x550 net/socket.c:3567 kernel_sendpage net/socket.c:3564 [inline] sock_sendpage+0xbd/0x190 net/socket.c:1054 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+0x63/0xcd Freed by task 21: 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:1754 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1780 slab_free mm/slub.c:3536 [inline] kfree+0xd6/0x4d0 mm/slub.c:4584 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 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+0x32d/0x9a0 net/core/rtnetlink.c:6089 netlink_rcv_skb+0x118/0x370 net/netlink/af_netlink.c:2501 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x433/0x710 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x782/0xc30 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xab/0xe0 net/socket.c:734 sock_no_sendpage+0xf3/0x130 net/core/sock.c:3161 kernel_sendpage.part.0+0x151/0x550 net/socket.c:3567 kernel_sendpage net/socket.c:3564 [inline] sock_sendpage+0xbd/0x190 net/socket.c:1054 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+0x63/0xcd 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:3126 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+0x32d/0x9a0 net/core/rtnetlink.c:6089 netlink_rcv_skb+0x118/0x370 net/netlink/af_netlink.c:2501 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x433/0x710 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x782/0xc30 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xab/0xe0 net/socket.c:734 sock_no_sendpage+0xf3/0x130 net/core/sock.c:3161 kernel_sendpage.part.0+0x151/0x550 net/socket.c:3567 kernel_sendpage net/socket.c:3564 [inline] sock_sendpage+0xbd/0x190 net/socket.c:1054 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+0x63/0xcd The buggy address belongs to the object at ffff88801c132c00 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 64 bytes inside of 96-byte region [ffff88801c132c00, ffff88801c132c60) The buggy address belongs to the physical page: page:ffffea0000704c80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1c132 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea0000576640 dead000000000004 ffff888010041780 raw: 0000000000000000 0000000080200020 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 3013, tgid 3013 (udevd), ts 19131450827, free_ts 19113212741 prep_new_page mm/page_alloc.c:2456 [inline] get_page_from_freelist+0x19d3/0x3b30 mm/page_alloc.c:4198 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5426 alloc_slab_page mm/slub.c:1824 [inline] allocate_slab+0x26c/0x3c0 mm/slub.c:1969 new_slab mm/slub.c:2029 [inline] ___slab_alloc+0x9bc/0xe10 mm/slub.c:3031 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3118 slab_alloc_node mm/slub.c:3209 [inline] slab_alloc mm/slub.c:3251 [inline] __kmalloc+0x318/0x350 mm/slub.c:4442 kmalloc include/linux/slab.h:605 [inline] kzalloc include/linux/slab.h:733 [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:1645 do_dentry_open+0x300/0xfe0 fs/open.c:835 do_open fs/namei.c:3520 [inline] path_openat+0x9cf/0x2360 fs/namei.c:3653 do_filp_open+0x199/0x3d0 fs/namei.c:3680 do_sys_openat2+0x11e/0x3f0 fs/open.c:1278 do_sys_open fs/open.c:1294 [inline] __do_sys_openat fs/open.c:1310 [inline] __se_sys_openat fs/open.c:1305 [inline] __x64_sys_openat+0x11b/0x1d0 fs/open.c:1305 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: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 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:294 __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:750 [inline] slab_alloc_node mm/slub.c:3243 [inline] slab_alloc mm/slub.c:3251 [inline] __kmem_cache_alloc_lru mm/slub.c:3258 [inline] kmem_cache_alloc+0x204/0x3b0 mm/slub.c:3268 getname_flags.part.0+0x4a/0x440 fs/namei.c:139 do_sys_openat2+0xd2/0x3f0 fs/open.c:1272 do_sys_open fs/open.c:1294 [inline] __do_sys_openat fs/open.c:1310 [inline] __se_sys_openat fs/open.c:1305 [inline] __x64_sys_openat+0x11b/0x1d0 fs/open.c:1305 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+0x63/0xcd Memory state around the buggy address: ffff88801c132b00: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc ffff88801c132b80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc >ffff88801c132c00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff88801c132c80: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc ffff88801c132d00: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc 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