syzbot

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BUG: KASAN: slab-use-after-free in msft_opcode_get+0x6d/0x80 drivers/bluetooth/hci_vhci.c:222
Read of size 2 at addr ffff8880289b4a32 by task syz.1.530/7883

CPU: 0 UID: 0 PID: 7883 Comm: syz.1.530 Not tainted 6.14.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __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+0xd9/0x110 mm/kasan/report.c:634
 msft_opcode_get+0x6d/0x80 drivers/bluetooth/hci_vhci.c:222
 simple_attr_read+0x169/0x370 fs/libfs.c:1334
 debugfs_attr_read+0x76/0xa0 fs/debugfs/file.c:534
 full_proxy_read+0x13c/0x200 fs/debugfs/file.c:393
 vfs_read+0x1df/0xbf0 fs/read_write.c:563
 ksys_read+0x12b/0x250 fs/read_write.c:708
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fedfc58d169
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fedfd3f4038 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007fedfc7a6080 RCX: 00007fedfc58d169
RDX: 000000000000ffff RSI: 0000400000006740 RDI: 0000000000000006
RBP: 00007fedfc60e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fedfc7a6080 R15: 00007fff5f2d1c28
 </TASK>

Allocated by task 68:
 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
 kasan_kmalloc include/linux/kasan.h:260 [inline]
 __do_kmalloc_node mm/slub.c:4294 [inline]
 __kmalloc_noprof+0x21c/0x510 mm/slub.c:4306
 kmalloc_noprof include/linux/slab.h:905 [inline]
 kzalloc_noprof include/linux/slab.h:1037 [inline]
 ieee802_11_parse_elems_full+0x1d0/0x3240 net/mac80211/parse.c:1013
 ieee802_11_parse_elems_crc net/mac80211/ieee80211_i.h:2397 [inline]
 ieee802_11_parse_elems net/mac80211/ieee80211_i.h:2404 [inline]
 ieee80211_inform_bss+0xfd/0x1100 net/mac80211/scan.c:79
 rdev_inform_bss net/wireless/rdev-ops.h:418 [inline]
 cfg80211_inform_single_bss_data+0x8f9/0x1df0 net/wireless/scan.c:2367
 cfg80211_inform_bss_data+0x205/0x3ba0 net/wireless/scan.c:3222
 cfg80211_inform_bss_frame_data+0x272/0x7a0 net/wireless/scan.c:3317
 ieee80211_bss_info_update+0x311/0xab0 net/mac80211/scan.c:226
 ieee80211_scan_rx+0x474/0xac0 net/mac80211/scan.c:340
 __ieee80211_rx_handle_packet net/mac80211/rx.c:5246 [inline]
 ieee80211_rx_list+0x1bd7/0x2970 net/mac80211/rx.c:5483
 ieee80211_rx_napi+0xdd/0x400 net/mac80211/rx.c:5506
 ieee80211_rx include/net/mac80211.h:5172 [inline]
 ieee80211_handle_queued_frames+0xd5/0x130 net/mac80211/main.c:441
 tasklet_action_common+0x251/0x3f0 kernel/softirq.c:811
 handle_softirqs+0x213/0x8f0 kernel/softirq.c:561
 __do_softirq kernel/softirq.c:595 [inline]
 invoke_softirq kernel/softirq.c:435 [inline]
 __irq_exit_rcu+0x109/0x170 kernel/softirq.c:662
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:678
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1049
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702

Freed by task 68:
 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:2353 [inline]
 slab_free mm/slub.c:4609 [inline]
 kfree+0x2c4/0x4d0 mm/slub.c:4757
 ieee80211_inform_bss+0x76e/0x1100 net/mac80211/scan.c:160
 rdev_inform_bss net/wireless/rdev-ops.h:418 [inline]
 cfg80211_inform_single_bss_data+0x8f9/0x1df0 net/wireless/scan.c:2367
 cfg80211_inform_bss_data+0x205/0x3ba0 net/wireless/scan.c:3222
 cfg80211_inform_bss_frame_data+0x272/0x7a0 net/wireless/scan.c:3317
 ieee80211_bss_info_update+0x311/0xab0 net/mac80211/scan.c:226
 ieee80211_scan_rx+0x474/0xac0 net/mac80211/scan.c:340
 __ieee80211_rx_handle_packet net/mac80211/rx.c:5246 [inline]
 ieee80211_rx_list+0x1bd7/0x2970 net/mac80211/rx.c:5483
 ieee80211_rx_napi+0xdd/0x400 net/mac80211/rx.c:5506
 ieee80211_rx include/net/mac80211.h:5172 [inline]
 ieee80211_handle_queued_frames+0xd5/0x130 net/mac80211/main.c:441
 tasklet_action_common+0x251/0x3f0 kernel/softirq.c:811
 handle_softirqs+0x213/0x8f0 kernel/softirq.c:561
 __do_softirq kernel/softirq.c:595 [inline]
 invoke_softirq kernel/softirq.c:435 [inline]
 __irq_exit_rcu+0x109/0x170 kernel/softirq.c:662
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:678
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1049
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702

The buggy address belongs to the object at ffff8880289b4800
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 562 bytes inside of
 freed 1024-byte region [ffff8880289b4800, ffff8880289b4c00)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x289b0
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801b041dc0 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801b041dc0 dead000000000100 dead000000000122
head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000003 ffffea0000a26c01 ffffffffffffffff 0000000000000000
head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x252800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_THISNODE), pid 52, tgid 52 (kworker/u8:3), ts 11635675091, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x181/0x1b0 mm/page_alloc.c:1551
 prep_new_page mm/page_alloc.c:1559 [inline]
 get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3477
 __alloc_frozen_pages_noprof+0x221/0x2470 mm/page_alloc.c:4740
 alloc_slab_page mm/slub.c:2425 [inline]
 allocate_slab mm/slub.c:2587 [inline]
 new_slab+0x94/0x330 mm/slub.c:2640
 ___slab_alloc+0xc5d/0x1720 mm/slub.c:3826
 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3916
 __slab_alloc_node mm/slub.c:3991 [inline]
 slab_alloc_node mm/slub.c:4152 [inline]
 __kmalloc_cache_node_noprof+0x101/0x420 mm/slub.c:4333
 kmalloc_node_noprof include/linux/slab.h:924 [inline]
 blk_mq_alloc_hctx block/blk-mq.c:3945 [inline]
 blk_mq_alloc_and_init_hctx+0x639/0x11b0 block/blk-mq.c:4448
 blk_mq_realloc_hw_ctxs+0x8e0/0xbe0 block/blk-mq.c:4481
 blk_mq_init_allocated_queue+0x39e/0x11f0 block/blk-mq.c:4535
 blk_mq_alloc_queue+0x1c3/0x290 block/blk-mq.c:4348
 scsi_alloc_sdev+0x890/0xd80 drivers/scsi/scsi_scan.c:338
 scsi_probe_and_add_lun+0x789/0xda0 drivers/scsi/scsi_scan.c:1209
 __scsi_scan_target+0x1ea/0x580 drivers/scsi/scsi_scan.c:1774
 scsi_scan_channel drivers/scsi/scsi_scan.c:1862 [inline]
 scsi_scan_channel+0x149/0x1e0 drivers/scsi/scsi_scan.c:1838
 scsi_scan_host_selected+0x302/0x400 drivers/scsi/scsi_scan.c:1891
page_owner free stack trace missing

Memory state around the buggy address:
 ffff8880289b4900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880289b4980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880289b4a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff8880289b4a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880289b4b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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