================================================================== BUG: KASAN: slab-use-after-free in force_wakeup_read+0x136/0x150 drivers/bluetooth/hci_vhci.c:170 Read of size 1 at addr ffff88807aa49a31 by task syz.4.3810/23793 CPU: 0 UID: 0 PID: 23793 Comm: syz.4.3810 Not tainted 6.13.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 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 force_wakeup_read+0x136/0x150 drivers/bluetooth/hci_vhci.c:170 full_proxy_read+0xfd/0x1b0 fs/debugfs/file.c:364 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: 0033:0x7ff19c785d29 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:00007ff19d5b1038 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007ff19c975fa0 RCX: 00007ff19c785d29 RDX: 0000000000000026 RSI: 0000000020000040 RDI: 0000000000000007 RBP: 00007ff19c801b08 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ff19c975fa0 R15: 00007fffaf4eedb8 Allocated by task 13913: 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:3236 process_scheduled_works kernel/workqueue.c:3317 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3398 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 13913: 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:3236 process_scheduled_works kernel/workqueue.c:3317 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3398 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 ffff88807aa49800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 561 bytes inside of freed 1024-byte region [ffff88807aa49800, ffff88807aa49c00) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88807aa4b000 pfn:0x7aa48 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000240 ffff88801ac41dc0 ffffea00024a3210 ffffea00009c3e10 raw: ffff88807aa4b000 000000000010000b 00000001f5000000 0000000000000000 head: 00fff00000000240 ffff88801ac41dc0 ffffea00024a3210 ffffea00009c3e10 head: ffff88807aa4b000 000000000010000b 00000001f5000000 0000000000000000 head: 00fff00000000003 ffffea0001ea9201 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 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 17249, tgid 17248 (syz.4.2518), ts 774490672848, free_ts 774103670413 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_mpol_noprof+0x2c8/0x620 mm/mempolicy.c:2269 alloc_slab_page mm/slub.c:2423 [inline] allocate_slab mm/slub.c:2589 [inline] new_slab+0x2c9/0x410 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] __kmalloc_cache_noprof+0xf6/0x420 mm/slub.c:4324 kmalloc_noprof include/linux/slab.h:901 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] sctp_transport_new+0x93/0x6e0 net/sctp/transport.c:97 sctp_assoc_add_peer+0x2e5/0x14b0 net/sctp/associola.c:617 sctp_process_param net/sctp/sm_make_chunk.c:2576 [inline] sctp_process_init+0x2733/0x2d60 net/sctp/sm_make_chunk.c:2396 sctp_cmd_process_init net/sctp/sm_sideeffect.c:706 [inline] sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1389 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1198 [inline] sctp_do_sm+0x15df/0x5c90 net/sctp/sm_sideeffect.c:1169 sctp_assoc_bh_rcv+0x392/0x6f0 net/sctp/associola.c:1052 sctp_inq_push+0x1d8/0x270 net/sctp/inqueue.c:88 sctp_backlog_rcv+0x169/0x590 net/sctp/input.c:331 sk_backlog_rcv include/net/sock.h:1121 [inline] __release_sock+0x35f/0x400 net/core/sock.c:3086 page last free pid 12971 tgid 12971 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_unref_page+0x661/0x1080 mm/page_alloc.c:2659 __folio_put+0x32a/0x450 mm/swap.c:112 folio_put include/linux/mm.h:1489 [inline] put_page+0x21e/0x280 include/linux/mm.h:1561 skb_page_unref include/linux/skbuff_ref.h:43 [inline] __skb_frag_unref include/linux/skbuff_ref.h:56 [inline] skb_release_data+0x4d7/0x730 net/core/skbuff.c:1119 skb_release_all net/core/skbuff.c:1190 [inline] __kfree_skb+0x4f/0x70 net/core/skbuff.c:1204 tcp_wmem_free_skb include/net/tcp.h:306 [inline] tcp_rtx_queue_unlink_and_free include/net/tcp.h:2091 [inline] tcp_clean_rtx_queue net/ipv4/tcp_input.c:3436 [inline] tcp_ack+0x1eb7/0x5ba0 net/ipv4/tcp_input.c:4032 tcp_rcv_established+0x53d/0x20d0 net/ipv4/tcp_input.c:6253 tcp_v4_do_rcv+0x5ca/0xa90 net/ipv4/tcp_ipv4.c:1916 tcp_v4_rcv+0x33b4/0x43a0 net/ipv4/tcp_ipv4.c:2351 ip_protocol_deliver_rcu+0xba/0x4c0 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x316/0x570 net/ipv4/ip_input.c:233 NF_HOOK include/linux/netfilter.h:314 [inline] NF_HOOK include/linux/netfilter.h:308 [inline] ip_local_deliver+0x18e/0x1f0 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:460 [inline] ip_sublist_rcv_finish+0x2c1/0x620 net/ipv4/ip_input.c:578 ip_list_rcv_finish.constprop.0+0x559/0x720 net/ipv4/ip_input.c:628 ip_sublist_rcv net/ipv4/ip_input.c:636 [inline] ip_list_rcv+0x339/0x450 net/ipv4/ip_input.c:670 __netif_receive_skb_list_ptype net/core/dev.c:5747 [inline] __netif_receive_skb_list_core+0x755/0x950 net/core/dev.c:5794 Memory state around the buggy address: ffff88807aa49900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807aa49980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807aa49a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807aa49a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807aa49b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================