[syzbot] [net?] KASAN: slab-use-after-free Read in taprio_dump

From: syzbot
Date: Mon Dec 18 2023 - 09:33:49 EST

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Hello,

syzbot found the following issue on:

HEAD commit: d5b235ec8eab Merge branch 'for-next/core' into for-kernelci
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=126c1c8ae80000
kernel config: https://syzkaller.appspot.com/x/.config?x=f36ea342ce412b14
dashboard link: https://syzkaller.appspot.com/bug?extid=d4d8c0fd15a0abe39bcf
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=112380bae80000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15e40371e80000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/edab88544ce7/disk-d5b235ec.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2d149255b78d/vmlinux-d5b235ec.xz
kernel image: https://storage.googleapis.com/syzbot-assets/c3bfc66db2fc/Image-d5b235ec.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d4d8c0fd15a0abe39bcf@xxxxxxxxxxxxxxxxxxxxxxxxx

==================================================================
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 ffff0000c1f660d8 by task syz-executor368/7987

CPU: 0 PID: 7987 Comm: syz-executor368 Not tainted 6.7.0-rc5-syzkaller-gd5b235ec8eab #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
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:364 [inline]
print_report+0x174/0x514 mm/kasan/report.c:475
kasan_report+0xd8/0x138 mm/kasan/report.c:588
__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+0x1a0/0x338 net/sched/sch_api.c:1024
tc_modify_qdisc+0x16d4/0x1870 net/sched/sch_api.c:1719
rtnetlink_rcv_msg+0x748/0xdbc net/core/rtnetlink.c:6558
netlink_rcv_skb+0x214/0x3c4 net/netlink/af_netlink.c:2545
rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6576
netlink_unicast_kernel net/netlink/af_netlink.c:1342 [inline]
netlink_unicast+0x65c/0x898 net/netlink/af_netlink.c:1368
netlink_sendmsg+0x83c/0xb20 net/netlink/af_netlink.c:1910
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:37 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155
el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678
el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696
el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595

Allocated by task 7987:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4c/0x7c mm/kasan/common.c:52
kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:511
____kasan_kmalloc mm/kasan/common.c:374 [inline]
__kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:383
kasan_kmalloc include/linux/kasan.h:198 [inline]
kmalloc_trace+0x70/0x88 mm/slab_common.c:1103
kmalloc include/linux/slab.h:600 [inline]
kzalloc include/linux/slab.h:721 [inline]
taprio_change+0xd74/0x3c54 net/sched/sch_taprio.c:1881
qdisc_change net/sched/sch_api.c:1387 [inline]
tc_modify_qdisc+0x1474/0x1870 net/sched/sch_api.c:1717
rtnetlink_rcv_msg+0x748/0xdbc net/core/rtnetlink.c:6558
netlink_rcv_skb+0x214/0x3c4 net/netlink/af_netlink.c:2545
rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6576
netlink_unicast_kernel net/netlink/af_netlink.c:1342 [inline]
netlink_unicast+0x65c/0x898 net/netlink/af_netlink.c:1368
netlink_sendmsg+0x83c/0xb20 net/netlink/af_netlink.c:1910
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:37 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155
el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678
el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696
el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595

Freed by task 40:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4c/0x7c mm/kasan/common.c:52
kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:522
____kasan_slab_free+0x144/0x1c0 mm/kasan/common.c:236
__kasan_slab_free+0x18/0x28 mm/kasan/common.c:244
kasan_slab_free include/linux/kasan.h:164 [inline]
slab_free_hook mm/slub.c:1800 [inline]
slab_free_freelist_hook mm/slub.c:1826 [inline]
slab_free mm/slub.c:3809 [inline]
__kmem_cache_free+0x2ac/0x480 mm/slub.c:3822
kfree+0xb8/0x19c mm/slab_common.c:1056
taprio_free_sched_cb+0x158/0x178 net/sched/sch_taprio.c:199
rcu_do_batch kernel/rcu/tree.c:2158 [inline]
rcu_core+0x890/0x1b34 kernel/rcu/tree.c:2431
rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2448
__do_softirq+0x2d8/0xce4 kernel/softirq.c:553

Last potentially related work creation:
kasan_save_stack+0x40/0x6c mm/kasan/common.c:45
__kasan_record_aux_stack+0xcc/0xe8 mm/kasan/generic.c:492
kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:502
__call_rcu_common kernel/rcu/tree.c:2681 [inline]
call_rcu+0x104/0xaf4 kernel/rcu/tree.c:2795
switch_schedules net/sched/sch_taprio.c:210 [inline]
advance_sched+0x7e0/0xac0 net/sched/sch_taprio.c:984
__run_hrtimer kernel/time/hrtimer.c:1688 [inline]
__hrtimer_run_queues+0x484/0xca0 kernel/time/hrtimer.c:1752
hrtimer_interrupt+0x2c0/0xb64 kernel/time/hrtimer.c:1814
timer_handler drivers/clocksource/arm_arch_timer.c:674 [inline]
arch_timer_handler_virt+0x74/0x88 drivers/clocksource/arm_arch_timer.c:685
handle_percpu_devid_irq+0x2a4/0x804 kernel/irq/chip.c:942
generic_handle_irq_desc include/linux/irqdesc.h:161 [inline]
handle_irq_desc kernel/irq/irqdesc.c:672 [inline]
generic_handle_domain_irq+0x7c/0xc4 kernel/irq/irqdesc.c:728
__gic_handle_irq drivers/irqchip/irq-gic-v3.c:782 [inline]
__gic_handle_irq_from_irqson drivers/irqchip/irq-gic-v3.c:833 [inline]
gic_handle_irq+0x6c/0x190 drivers/irqchip/irq-gic-v3.c:877

Second to last potentially related work creation:
kasan_save_stack+0x40/0x6c mm/kasan/common.c:45
__kasan_record_aux_stack+0xcc/0xe8 mm/kasan/generic.c:492
kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:502
__call_rcu_common kernel/rcu/tree.c:2681 [inline]
call_rcu+0x104/0xaf4 kernel/rcu/tree.c:2795
switch_schedules net/sched/sch_taprio.c:210 [inline]
advance_sched+0x7e0/0xac0 net/sched/sch_taprio.c:984
__run_hrtimer kernel/time/hrtimer.c:1688 [inline]
__hrtimer_run_queues+0x484/0xca0 kernel/time/hrtimer.c:1752
hrtimer_interrupt+0x2c0/0xb64 kernel/time/hrtimer.c:1814
timer_handler drivers/clocksource/arm_arch_timer.c:674 [inline]
arch_timer_handler_virt+0x74/0x88 drivers/clocksource/arm_arch_timer.c:685
handle_percpu_devid_irq+0x2a4/0x804 kernel/irq/chip.c:942
generic_handle_irq_desc include/linux/irqdesc.h:161 [inline]
handle_irq_desc kernel/irq/irqdesc.c:672 [inline]
generic_handle_domain_irq+0x7c/0xc4 kernel/irq/irqdesc.c:728
__gic_handle_irq drivers/irqchip/irq-gic-v3.c:782 [inline]
__gic_handle_irq_from_irqson drivers/irqchip/irq-gic-v3.c:833 [inline]
gic_handle_irq+0x6c/0x190 drivers/irqchip/irq-gic-v3.c:877

The buggy address belongs to the object at ffff0000c1f66000
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 216 bytes inside of
freed 512-byte region [ffff0000c1f66000, ffff0000c1f66200)

The buggy address belongs to the physical page:
page:00000000dead7e4a refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000c1f64800 pfn:0x101f64
head:00000000dead7e4a 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 fffffc00036bd110 fffffc0003653210
raw: ffff0000c1f64800 000000000010000e 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
ffff0000c1f65f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff0000c1f66000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff0000c1f66080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff0000c1f66100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff0000c1f66180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

---
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Next message: Himanshu Bhavani: "[PATCH] ASoC: amd: acp: Remove redundant ret variable"
Previous message: Christoph Hellwig: "Re: [PATCH 3/5] block: remove support for the host aware zone model"
Next in thread: Hillf Danton: "Re: [syzbot] [net?] KASAN: slab-use-after-free Read in taprio_dump"
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