================================================================== BUG: KASAN: slab-use-after-free in msft_opcode_get+0x6d/0x80 drivers/bluetooth/hci_vhci.c:222 Read of size 2 at addr ffff888027af8232 by task syz.5.5270/17561 CPU: 0 UID: 0 PID: 17561 Comm: syz.5.5270 Not tainted 6.13.0-rc3-syzkaller-00301-gbcde95ce32b6 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 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:378 [inline] print_report+0xc3/0x620 mm/kasan/report.c:489 kasan_report+0xd9/0x110 mm/kasan/report.c:602 msft_opcode_get+0x6d/0x80 drivers/bluetooth/hci_vhci.c:222 simple_attr_read+0x169/0x300 fs/libfs.c:1341 debugfs_attr_read+0x74/0xa0 fs/debugfs/file.c:507 full_proxy_read+0xfb/0x1b0 fs/debugfs/file.c:351 vfs_read+0x1df/0xbe0 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: 0033:0x7fd057385d29 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:00007fd0551f6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007fd057575fa0 RCX: 00007fd057385d29 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007fd057401aa8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fd057575fa0 R15: 00007fffcb1db578 Allocated by task 2893: 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:4298 [inline] __kmalloc_noprof+0x21a/0x4f0 mm/slub.c:4310 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] ieee802_11_parse_elems_full+0xe6/0x1630 net/mac80211/parse.c:958 ieee802_11_parse_elems_crc net/mac80211/ieee80211_i.h:2384 [inline] ieee802_11_parse_elems net/mac80211/ieee80211_i.h:2391 [inline] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1576 [inline] ieee80211_ibss_rx_queued_mgmt+0xc54/0x3040 net/mac80211/ibss.c:1607 ieee80211_iface_process_skb net/mac80211/iface.c:1613 [inline] ieee80211_iface_work+0xc0b/0xf00 net/mac80211/iface.c:1667 cfg80211_wiphy_work+0x3de/0x560 net/wireless/core.c:440 process_one_work+0x958/0x1b30 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Freed by task 2893: 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:582 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:4613 [inline] kfree+0x14f/0x4b0 mm/slub.c:4761 ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1581 [inline] ieee80211_ibss_rx_queued_mgmt+0x1ae3/0x3040 net/mac80211/ibss.c:1607 ieee80211_iface_process_skb net/mac80211/iface.c:1613 [inline] ieee80211_iface_work+0xc0b/0xf00 net/mac80211/iface.c:1667 cfg80211_wiphy_work+0x3de/0x560 net/wireless/core.c:440 process_one_work+0x958/0x1b30 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 The buggy address belongs to the object at ffff888027af8000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 562 bytes inside of freed 1024-byte region [ffff888027af8000, ffff888027af8400) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x27af8 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 ffff88801ac41dc0 ffffea00009f7c00 dead000000000002 raw: 0000000000000000 0000000000100010 00000001f5000000 0000000000000000 head: 00fff00000000040 ffff88801ac41dc0 ffffea00009f7c00 dead000000000002 head: 0000000000000000 0000000000100010 00000001f5000000 0000000000000000 head: 00fff00000000003 ffffea00009ebe01 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 35, tgid 35 (kworker/u8:2), ts 14661150013, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1558 prep_new_page mm/page_alloc.c:1566 [inline] get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3476 __alloc_pages_noprof+0x223/0x25b0 mm/page_alloc.c:4753 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_slab_page mm/slub.c:2425 [inline] allocate_slab mm/slub.c:2589 [inline] new_slab+0xca/0x410 mm/slub.c:2642 ___slab_alloc+0xce2/0x1650 mm/slub.c:3830 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3920 __slab_alloc_node mm/slub.c:3995 [inline] slab_alloc_node mm/slub.c:4156 [inline] __do_kmalloc_node mm/slub.c:4297 [inline] __kmalloc_node_noprof+0x2f0/0x520 mm/slub.c:4304 kmalloc_node_noprof include/linux/slab.h:928 [inline] blk_alloc_flush_queue+0x111/0x2c0 block/blk-flush.c:490 blk_mq_alloc_hctx block/blk-mq.c:3975 [inline] blk_mq_alloc_and_init_hctx+0xc6c/0x11b0 block/blk-mq.c:4443 blk_mq_realloc_hw_ctxs+0x8e0/0xbe0 block/blk-mq.c:4476 blk_mq_init_allocated_queue+0x39e/0x11f0 block/blk-mq.c:4530 blk_mq_alloc_queue+0x1ef/0x2e0 block/blk-mq.c:4343 scsi_alloc_sdev+0x890/0xd80 drivers/scsi/scsi_scan.c:337 scsi_probe_and_add_lun+0x789/0xda0 drivers/scsi/scsi_scan.c:1210 __scsi_scan_target+0x1ea/0x580 drivers/scsi/scsi_scan.c:1757 scsi_scan_channel drivers/scsi/scsi_scan.c:1845 [inline] scsi_scan_channel+0x149/0x1e0 drivers/scsi/scsi_scan.c:1821 page_owner free stack trace missing Memory state around the buggy address: ffff888027af8100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888027af8180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888027af8200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888027af8280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888027af8300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================