================================================================== BUG: KASAN: slab-use-after-free in msft_opcode_get+0x6d/0x80 drivers/bluetooth/hci_vhci.c:222 Read of size 2 at addr ffff888027397232 by task syz.0.666/9253 CPU: 1 UID: 0 PID: 9253 Comm: syz.0.666 Not tainted 6.14.0-rc5-syzkaller-00013-g99fa936e8e4f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __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: 0033:0x7f3f4078d169 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:00007f3f4154f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007f3f409a6080 RCX: 00007f3f4078d169 RDX: 000000000000ffff RSI: 0000400000006740 RDI: 0000000000000007 RBP: 00007f3f4080e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f3f409a6080 R15: 00007fffeb844c68 Allocated by task 6922: 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+0xf2/0x18c0 net/mac80211/parse.c:985 ieee802_11_parse_elems_crc net/mac80211/ieee80211_i.h:2397 [inline] ieee802_11_parse_elems net/mac80211/ieee80211_i.h:2404 [inline] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1577 [inline] ieee80211_ibss_rx_queued_mgmt+0xc4f/0x2f50 net/mac80211/ibss.c:1608 ieee80211_iface_process_skb net/mac80211/iface.c:1611 [inline] ieee80211_iface_work+0xc15/0xf50 net/mac80211/iface.c:1665 cfg80211_wiphy_work+0x3ed/0x570 net/wireless/core.c:435 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3400 kthread+0x3af/0x750 kernel/kthread.c:464 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Freed by task 6922: 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_rx_mgmt_probe_beacon net/mac80211/ibss.c:1582 [inline] ieee80211_ibss_rx_queued_mgmt+0x1a29/0x2f50 net/mac80211/ibss.c:1608 ieee80211_iface_process_skb net/mac80211/iface.c:1611 [inline] ieee80211_iface_work+0xc15/0xf50 net/mac80211/iface.c:1665 cfg80211_wiphy_work+0x3ed/0x570 net/wireless/core.c:435 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3400 kthread+0x3af/0x750 kernel/kthread.c:464 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 The buggy address belongs to the object at ffff888027397000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 562 bytes inside of freed 1024-byte region [ffff888027397000, ffff888027397400) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x27390 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801b041dc0 0000000000000000 dead000000000001 raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801b041dc0 0000000000000000 dead000000000001 head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 00fff00000000003 ffffea00009ce401 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 12, tgid 12 (kworker/u8:1), ts 8938207384, 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:4739 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: ffff888027397100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888027397180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888027397200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888027397280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888027397300: fb fb fb fb fb fb 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