================================================================== BUG: KASAN: use-after-free in dump_schedule+0x7a7/0x820 net/sched/sch_taprio.c:1770 Read of size 8 at addr ffff888023d58a40 by task syz-executor.1/12145 CPU: 1 PID: 12145 Comm: syz-executor.1 Not tainted 5.10.0-rc1-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+0x198/0x1fb lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xae/0x497 mm/kasan/report.c:385 __kasan_report mm/kasan/report.c:545 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:562 dump_schedule+0x7a7/0x820 net/sched/sch_taprio.c:1770 taprio_dump+0x55d/0xce0 net/sched/sch_taprio.c:1839 tc_fill_qdisc+0x5e7/0x1220 net/sched/sch_api.c:916 qdisc_notify.isra.0+0x2b1/0x310 net/sched/sch_api.c:983 tc_modify_qdisc+0xf45/0x1990 net/sched/sch_api.c:1635 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5562 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:671 sock_no_sendpage+0xee/0x130 net/core/sock.c:2833 kernel_sendpage.part.0+0x1ab/0x350 net/socket.c:3646 kernel_sendpage net/socket.c:3643 [inline] sock_sendpage+0xe5/0x140 net/socket.c:944 pipe_to_sendpage+0x2ad/0x380 fs/splice.c:364 splice_from_pipe_feed fs/splice.c:418 [inline] __splice_from_pipe+0x3dc/0x830 fs/splice.c:562 splice_from_pipe fs/splice.c:597 [inline] generic_splice_sendpage+0xd4/0x140 fs/splice.c:743 do_splice_from fs/splice.c:764 [inline] do_splice+0xb78/0x17a0 fs/splice.c:1059 __do_splice+0x134/0x250 fs/splice.c:1137 __do_sys_splice fs/splice.c:1343 [inline] __se_sys_splice fs/splice.c:1325 [inline] __x64_sys_splice+0x198/0x250 fs/splice.c:1325 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d5b9 Code: 5d 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 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fae838dac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 0000000000033980 RCX: 000000000045d5b9 RDX: 0000000000000004 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 000000000118cf98 R08: 0000000000010973 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c R13: 00007fff62d81abf R14: 00007fae838db9c0 R15: 000000000118cf4c Allocated by task 12126: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461 kmem_cache_alloc_trace+0x1a0/0x440 mm/slab.c:3552 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:664 [inline] taprio_change+0x5a0/0x2b60 net/sched/sch_taprio.c:1460 qdisc_change net/sched/sch_api.c:1331 [inline] tc_modify_qdisc+0xd41/0x1990 net/sched/sch_api.c:1633 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5562 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:671 sock_no_sendpage+0xee/0x130 net/core/sock.c:2833 kernel_sendpage.part.0+0x1ab/0x350 net/socket.c:3646 kernel_sendpage net/socket.c:3643 [inline] sock_sendpage+0xe5/0x140 net/socket.c:944 pipe_to_sendpage+0x2ad/0x380 fs/splice.c:364 splice_from_pipe_feed fs/splice.c:418 [inline] __splice_from_pipe+0x3dc/0x830 fs/splice.c:562 splice_from_pipe fs/splice.c:597 [inline] generic_splice_sendpage+0xd4/0x140 fs/splice.c:743 do_splice_from fs/splice.c:764 [inline] do_splice+0xb78/0x17a0 fs/splice.c:1059 __do_splice+0x134/0x250 fs/splice.c:1137 __do_sys_splice fs/splice.c:1343 [inline] __se_sys_splice fs/splice.c:1325 [inline] __x64_sys_splice+0x198/0x250 fs/splice.c:1325 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 9: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track+0x1c/0x30 mm/kasan/common.c:56 kasan_set_free_info+0x1b/0x30 mm/kasan/generic.c:355 __kasan_slab_free+0xd8/0x120 mm/kasan/common.c:422 __cache_free mm/slab.c:3420 [inline] kfree+0x10e/0x2a0 mm/slab.c:3758 taprio_free_sched_cb+0x18b/0x240 net/sched/sch_taprio.c:124 rcu_do_batch kernel/rcu/tree.c:2476 [inline] rcu_core+0x621/0x11d0 kernel/rcu/tree.c:2711 __do_softirq+0x202/0xa51 kernel/softirq.c:298 Last call_rcu(): kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_record_aux_stack+0x82/0xb0 mm/kasan/generic.c:346 __call_rcu kernel/rcu/tree.c:2953 [inline] call_rcu+0x15e/0x7c0 kernel/rcu/tree.c:3027 taprio_change+0x210a/0x2b60 net/sched/sch_taprio.c:1578 qdisc_change net/sched/sch_api.c:1331 [inline] tc_modify_qdisc+0xd41/0x1990 net/sched/sch_api.c:1633 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5562 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:671 sock_no_sendpage+0xee/0x130 net/core/sock.c:2833 kernel_sendpage.part.0+0x1ab/0x350 net/socket.c:3646 kernel_sendpage net/socket.c:3643 [inline] sock_sendpage+0xe5/0x140 net/socket.c:944 pipe_to_sendpage+0x2ad/0x380 fs/splice.c:364 splice_from_pipe_feed fs/splice.c:418 [inline] __splice_from_pipe+0x3dc/0x830 fs/splice.c:562 splice_from_pipe fs/splice.c:597 [inline] generic_splice_sendpage+0xd4/0x140 fs/splice.c:743 do_splice_from fs/splice.c:764 [inline] do_splice+0xb78/0x17a0 fs/splice.c:1059 __do_splice+0x134/0x250 fs/splice.c:1137 __do_sys_splice fs/splice.c:1343 [inline] __se_sys_splice fs/splice.c:1325 [inline] __x64_sys_splice+0x198/0x250 fs/splice.c:1325 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff888023d58a00 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 64 bytes inside of 96-byte region [ffff888023d58a00, ffff888023d58a60) The buggy address belongs to the page: page:000000001165fefb refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888023d58d00 pfn:0x23d58 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea000045a9c8 ffffea000085fb48 ffff88800dc40300 raw: ffff888023d58d00 ffff888023d58000 000000010000001e 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888023d58900: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ffff888023d58980: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc >ffff888023d58a00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff888023d58a80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff888023d58b00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ==================================================================