syzbot

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BUG: KASAN: slab-use-after-free in taprio_dump_tc_entries net/sched/sch_taprio.c:2307 [inline]
BUG: KASAN: slab-use-after-free in taprio_dump+0x72c/0xb94 net/sched/sch_taprio.c:2420
Read of size 4 at addr ffff0000c2114cc0 by task syz-executor315/11944

CPU: 1 PID: 11944 Comm: syz-executor315 Not tainted 6.8.0-rc7-syzkaller-g707081b61156 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
Call trace:
 dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:291
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:298
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x178/0x518 mm/kasan/report.c:488
 kasan_report+0xd8/0x138 mm/kasan/report.c:601
 __asan_report_load4_noabort+0x20/0x2c mm/kasan/report_generic.c:380
 taprio_dump_tc_entries net/sched/sch_taprio.c:2307 [inline]
 taprio_dump+0x72c/0xb94 net/sched/sch_taprio.c:2420
 tc_fill_qdisc+0x570/0xf1c net/sched/sch_api.c:952
 qdisc_notify+0x21c/0x3c4 net/sched/sch_api.c:1053
 tc_modify_qdisc+0x16d4/0x1870 net/sched/sch_api.c:1748
 rtnetlink_rcv_msg+0x748/0xdbc net/core/rtnetlink.c:6617
 netlink_rcv_skb+0x214/0x3c4 net/netlink/af_netlink.c:2543
 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6635
 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline]
 netlink_unicast+0x65c/0x898 net/netlink/af_netlink.c:1367
 netlink_sendmsg+0x83c/0xb20 net/netlink/af_netlink.c:1908
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 ____sys_sendmsg+0x56c/0x840 net/socket.c:2584
 ___sys_sendmsg net/socket.c:2638 [inline]
 __sys_sendmsg+0x26c/0x33c net/socket.c:2667
 __do_sys_sendmsg net/socket.c:2676 [inline]
 __se_sys_sendmsg net/socket.c:2674 [inline]
 __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2674
 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598

Allocated by task 11942:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x40/0x78 mm/kasan/common.c:68
 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:575
 poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
 __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:387
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 kmalloc_trace+0x26c/0x49c mm/slub.c:4012
 kmalloc include/linux/slab.h:590 [inline]
 kzalloc include/linux/slab.h:711 [inline]
 taprio_change+0xd14/0x3bf0 net/sched/sch_taprio.c:1881
 qdisc_change net/sched/sch_api.c:1416 [inline]
 tc_modify_qdisc+0x1474/0x1870 net/sched/sch_api.c:1746
 rtnetlink_rcv_msg+0x748/0xdbc net/core/rtnetlink.c:6617
 netlink_rcv_skb+0x214/0x3c4 net/netlink/af_netlink.c:2543
 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6635
 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline]
 netlink_unicast+0x65c/0x898 net/netlink/af_netlink.c:1367
 netlink_sendmsg+0x83c/0xb20 net/netlink/af_netlink.c:1908
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 ____sys_sendmsg+0x56c/0x840 net/socket.c:2584
 ___sys_sendmsg net/socket.c:2638 [inline]
 __sys_sendmsg+0x26c/0x33c net/socket.c:2667
 __do_sys_sendmsg net/socket.c:2676 [inline]
 __se_sys_sendmsg net/socket.c:2674 [inline]
 __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2674
 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598

Freed by task 0:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x40/0x78 mm/kasan/common.c:68
 kasan_save_free_info+0x54/0x6c mm/kasan/generic.c:589
 poison_slab_object+0x124/0x18c mm/kasan/common.c:240
 __kasan_slab_free+0x3c/0x70 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+0x144/0x3cc mm/slub.c:4409
 taprio_free_sched_cb+0x158/0x178 net/sched/sch_taprio.c:199
 rcu_do_batch kernel/rcu/tree.c:2190 [inline]
 rcu_core+0x890/0x1b34 kernel/rcu/tree.c:2465
 rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2482
 __do_softirq+0x2d8/0xce4 kernel/softirq.c:553

Last potentially related work creation:
 kasan_save_stack+0x40/0x6c mm/kasan/common.c:47
 __kasan_record_aux_stack+0xcc/0xe8 mm/kasan/generic.c:551
 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:561
 __call_rcu_common kernel/rcu/tree.c:2715 [inline]
 call_rcu+0x104/0xaf4 kernel/rcu/tree.c:2829
 taprio_change+0x3288/0x3bf0 net/sched/sch_taprio.c:1991
 qdisc_change net/sched/sch_api.c:1416 [inline]
 tc_modify_qdisc+0x1474/0x1870 net/sched/sch_api.c:1746
 rtnetlink_rcv_msg+0x748/0xdbc net/core/rtnetlink.c:6617
 netlink_rcv_skb+0x214/0x3c4 net/netlink/af_netlink.c:2543
 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6635
 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline]
 netlink_unicast+0x65c/0x898 net/netlink/af_netlink.c:1367
 netlink_sendmsg+0x83c/0xb20 net/netlink/af_netlink.c:1908
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 ____sys_sendmsg+0x56c/0x840 net/socket.c:2584
 ___sys_sendmsg net/socket.c:2638 [inline]
 __sys_sendmsg+0x26c/0x33c net/socket.c:2667
 __do_sys_sendmsg net/socket.c:2676 [inline]
 __se_sys_sendmsg net/socket.c:2674 [inline]
 __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2674
 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598

The buggy address belongs to the object at ffff0000c2114c00
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 192 bytes inside of
 freed 512-byte region [ffff0000c2114c00, ffff0000c2114e00)

The buggy address belongs to the physical page:
page:000000009b88ca19 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102114
head:000000009b88ca19 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x5ffc00000000840(slab|head|node=0|zone=2|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 05ffc00000000840 ffff0000c0001c80 fffffdffc3571400 dead000000000002
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000c2114b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000c2114c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff0000c2114c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff0000c2114d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000c2114d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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