==================================================================
BUG: KASAN: slab-use-after-free in __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
BUG: KASAN: slab-use-after-free in _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
Read of size 1 at addr ffff88804cb34418 by task syz.2.14/6070
CPU: 0 UID: 0 PID: 6070 Comm: syz.2.14 Not tainted 6.15.0-rc6-syzkaller-00105-g088d13246a46 #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:408 [inline]
print_report+0xc3/0x670 mm/kasan/report.c:521
kasan_report+0xe0/0x110 mm/kasan/report.c:634
__kasan_check_byte+0x36/0x50 mm/kasan/common.c:557
kasan_check_byte include/linux/kasan.h:399 [inline]
lock_acquire kernel/locking/lockdep.c:5840 [inline]
lock_acquire+0xfc/0x350 kernel/locking/lockdep.c:5823
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
p9_tag_remove net/9p/client.c:397 [inline]
p9_req_put net/9p/client.c:405 [inline]
p9_req_put+0xaf/0x250 net/9p/client.c:402
req_done+0x1dc/0x2e0 net/9p/trans_virtio.c:147
vring_interrupt drivers/virtio/virtio_ring.c:2715 [inline]
vring_interrupt+0x31e/0x400 drivers/virtio/virtio_ring.c:2690
__handle_irq_event_percpu+0x22c/0x7d0 kernel/irq/handle.c:158
handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:210
handle_edge_irq+0x263/0xd10 kernel/irq/chip.c:831
generic_handle_irq_desc include/linux/irqdesc.h:173 [inline]
handle_irq arch/x86/kernel/irq.c:254 [inline]
call_irq_handler arch/x86/kernel/irq.c:266 [inline]
__common_interrupt+0xe2/0x250 arch/x86/kernel/irq.c:292
common_interrupt+0xba/0xe0 arch/x86/kernel/irq.c:285
</IRQ>
<TASK>
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
RIP: 0010:preempt_schedule_irq+0x4c/0x90 kernel/sched/core.c:7090
Code: df 55 65 48 8b 2d ec c2 38 08 53 48 89 eb 48 c1 eb 03 48 01 c3 bf 01 00 00 00 e8 bf 21 1e f6 e8 4a d6 57 f6 fb bf 01 00 00 00 <e8> af 99 ff ff 9c 58 fa f6 c4 02 75 1e bf 01 00 00 00 e8 0d cc 1d
RSP: 0018:ffffc90004ae7708 EFLAGS: 00000202
RAX: 0000000000009dc7 RBX: ffffed1004474488 RCX: 0000000000000006
RDX: 0000000000000000 RSI: ffffffff8dbdccdf RDI: 0000000000000001
RBP: ffff8880223a2440 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff90851f17 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
irqentry_exit+0x36/0x90 kernel/entry/common.c:354
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0010:__sanitizer_cov_trace_pc+0x46/0x70 kernel/kcov.c:220
Code: 74 1d f6 c4 01 74 43 a9 00 00 0f 00 75 3c a9 00 00 f0 00 75 35 8b 82 3c 16 00 00 85 c0 74 2b 8b 82 18 16 00 00 83 f8 02 75 20 <48> 8b 8a 20 16 00 00 8b 92 1c 16 00 00 48 8b 01 48 83 c0 01 48 39
RSP: 0018:ffffc90004ae77d8 EFLAGS: 00000246
RAX: 0000000000000002 RBX: ffff88806bf04f00 RCX: ffffc9000c761000
RDX: ffff8880223a2440 RSI: ffffffff8941718d RDI: ffff88805b855280
RBP: ffff88805b855280 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88805b8557f0 R14: 0000000000000000 R15: ffff888050505a00
skb_free_datagram+0xd/0x20 net/core/datagram.c:323
__unix_dgram_recvmsg+0x81d/0xee0 net/unix/af_unix.c:2505
unix_dgram_recvmsg+0xd0/0x110 net/unix/af_unix.c:2522
sock_recvmsg_nosec net/socket.c:1017 [inline]
____sys_recvmsg+0x5f9/0x6b0 net/socket.c:2784
___sys_recvmsg+0x114/0x1a0 net/socket.c:2828
do_recvmmsg+0x568/0x740 net/socket.c:2915
__sys_recvmmsg+0x21c/0x280 net/socket.c:2997
__do_compat_sys_recvmmsg_time32 net/compat.c:418 [inline]
__se_compat_sys_recvmmsg_time32 net/compat.c:414 [inline]
__ia32_compat_sys_recvmmsg_time32+0xc4/0x160 net/compat.c:414
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0x73/0x120 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf711e579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f50ed55c EFLAGS: 00000296 ORIG_RAX: 0000000000000151
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000800000c0
RDX: 0000000000010106 RSI: 0000000000000002 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
Allocated by task 6071:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394
kmalloc_noprof include/linux/slab.h:905 [inline]
p9_client_create+0xc7/0x11c0 net/9p/client.c:985
v9fs_session_init+0x1f7/0x1a80 fs/9p/v9fs.c:410
v9fs_mount+0xc5/0xa30 fs/9p/vfs_super.c:122
legacy_get_tree+0x109/0x220 fs/fs_context.c:662
vfs_get_tree+0x8b/0x340 fs/super.c:1759
do_new_mount fs/namespace.c:3881 [inline]
path_mount+0x14d4/0x1f20 fs/namespace.c:4208
do_mount fs/namespace.c:4221 [inline]
__do_sys_mount fs/namespace.c:4432 [inline]
__se_sys_mount fs/namespace.c:4409 [inline]
__ia32_sys_mount+0x28b/0x310 fs/namespace.c:4409
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0x73/0x120 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
Freed by task 6071:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x51/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2380 [inline]
slab_free mm/slub.c:4642 [inline]
kfree+0x2b6/0x4d0 mm/slub.c:4841
p9_client_create+0xa28/0x11c0 net/9p/client.c:1064
v9fs_session_init+0x1f7/0x1a80 fs/9p/v9fs.c:410
v9fs_mount+0xc5/0xa30 fs/9p/vfs_super.c:122
legacy_get_tree+0x109/0x220 fs/fs_context.c:662
vfs_get_tree+0x8b/0x340 fs/super.c:1759
do_new_mount fs/namespace.c:3881 [inline]
path_mount+0x14d4/0x1f20 fs/namespace.c:4208
do_mount fs/namespace.c:4221 [inline]
__do_sys_mount fs/namespace.c:4432 [inline]
__se_sys_mount fs/namespace.c:4409 [inline]
__ia32_sys_mount+0x28b/0x310 fs/namespace.c:4409
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0x73/0x120 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
The buggy address belongs to the object at ffff88804cb34400
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
freed 512-byte region [ffff88804cb34400, ffff88804cb34600)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4cb34
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x4fff00000000040(head|node=1|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 04fff00000000040 ffff88801b442c80 ffffea00016e9100 dead000000000002
raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
head: 04fff00000000040 ffff88801b442c80 ffffea00016e9100 dead000000000002
head: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
head: 04fff00000000002 ffffea000132cd01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 1135, tgid 1135 (kworker/u32:7), ts 48786679206, free_ts 48751870182
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x181/0x1b0 mm/page_alloc.c:1718
prep_new_page mm/page_alloc.c:1726 [inline]
get_page_from_freelist+0x135c/0x3920 mm/page_alloc.c:3688
__alloc_frozen_pages_noprof+0x263/0x23a0 mm/page_alloc.c:4970
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2301
alloc_slab_page mm/slub.c:2450 [inline]
allocate_slab mm/slub.c:2618 [inline]
new_slab+0x244/0x340 mm/slub.c:2672
___slab_alloc+0xd9c/0x1940 mm/slub.c:3858
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3948
__slab_alloc_node mm/slub.c:4023 [inline]
slab_alloc_node mm/slub.c:4184 [inline]
__kmalloc_cache_noprof+0xfb/0x3e0 mm/slub.c:4353
kmalloc_noprof include/linux/slab.h:905 [inline]
batadv_forw_packet_alloc+0x3ad/0x4e0 net/batman-adv/send.c:519
batadv_iv_ogm_aggregate_new+0x13c/0x4c0 net/batman-adv/bat_iv_ogm.c:571
batadv_iv_ogm_queue_add net/batman-adv/bat_iv_ogm.c:678 [inline]
batadv_iv_ogm_schedule_buff+0x99f/0x14e0 net/batman-adv/bat_iv_ogm.c:841
batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:876 [inline]
batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:869 [inline]
batadv_iv_send_outstanding_bat_ogm_packet+0x329/0x920 net/batman-adv/bat_iv_ogm.c:1720
process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c5/0x780 kernel/kthread.c:464
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:153
page last free pid 5989 tgid 5989 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1262 [inline]
__free_frozen_pages+0x69d/0xff0 mm/page_alloc.c:2725
discard_slab mm/slub.c:2716 [inline]
__put_partials+0x16d/0x1c0 mm/slub.c:3185
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x4e/0x120 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4147 [inline]
slab_alloc_node mm/slub.c:4196 [inline]
kmem_cache_alloc_noprof+0x1cb/0x3b0 mm/slub.c:4203
vm_area_alloc+0x1f/0x160 kernel/fork.c:441
__mmap_new_vma mm/vma.c:2402 [inline]
__mmap_region+0xfd0/0x27c0 mm/vma.c:2519
mmap_region+0x1ab/0x3f0 mm/vma.c:2597
do_mmap+0xd8e/0x11b0 mm/mmap.c:561
vm_mmap_pgoff+0x281/0x450 mm/util.c:579
ksys_mmap_pgoff+0x32c/0x5c0 mm/mmap.c:607
__do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
__se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline]
__x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x230 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff88804cb34300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88804cb34380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88804cb34400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88804cb34480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88804cb34500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: df 55 65 fists 0x65(%rbp)
3: 48 8b 2d ec c2 38 08 mov 0x838c2ec(%rip),%rbp # 0x838c2f6
a: 53 push %rbx
b: 48 89 eb mov %rbp,%rbx
e: 48 c1 eb 03 shr $0x3,%rbx
12: 48 01 c3 add %rax,%rbx
15: bf 01 00 00 00 mov $0x1,%edi
1a: e8 bf 21 1e f6 call 0xf61e21de
1f: e8 4a d6 57 f6 call 0xf657d66e
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 af 99 ff ff call 0xffff99de <-- trapping instruction
2f: 9c pushf
30: 58 pop %rax
31: fa cli
32: f6 c4 02 test $0x2,%ah
35: 75 1e jne 0x55
37: bf 01 00 00 00 mov $0x1,%edi
3c: e8 .byte 0xe8
3d: 0d .byte 0xd
3e: cc int3
3f: 1d .byte 0x1d