================================================================== BUG: KASAN: slab-use-after-free in hci_sock_get_cookie+0x49/0x50 net/bluetooth/hci_sock.c:96 Read of size 4 at addr ffff88807ce575b8 by task syz.2.893/10374 CPU: 0 UID: 0 PID: 10374 Comm: syz.2.893 Not tainted 6.13.0-rc6-syzkaller-00970-g7d0da8f86234 #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+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x169/0x550 mm/kasan/report.c:489 kasan_report+0x143/0x180 mm/kasan/report.c:602 hci_sock_get_cookie+0x49/0x50 net/bluetooth/hci_sock.c:96 mgmt_cmd_status+0x1be/0x4d0 net/bluetooth/mgmt_util.c:149 cmd_status_rsp net/bluetooth/mgmt.c:1458 [inline] cmd_complete_rsp+0x114/0x180 net/bluetooth/mgmt.c:1478 mgmt_pending_foreach+0xd1/0x130 net/bluetooth/mgmt_util.c:259 __mgmt_power_off+0x183/0x430 net/bluetooth/mgmt.c:9584 hci_dev_close_sync+0x6c4/0x11c0 net/bluetooth/hci_sync.c:5209 hci_dev_do_close net/bluetooth/hci_core.c:482 [inline] hci_dev_close+0x112/0x210 net/bluetooth/hci_core.c:507 sock_do_ioctl+0x158/0x460 net/socket.c:1222 sock_ioctl+0x626/0x8e0 net/socket.c:1341 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe461d85d29 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:00007fe462ca0038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fe461f75fa0 RCX: 00007fe461d85d29 RDX: 0000000000000000 RSI: 00000000400448ca RDI: 0000000000000008 RBP: 00007fe461e01b08 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fe461f75fa0 R15: 00007ffe25a1f6b8 Allocated by task 6843: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4298 [inline] __kmalloc_noprof+0x285/0x4c0 mm/slub.c:4310 kmalloc_noprof include/linux/slab.h:905 [inline] sk_prot_alloc+0xe0/0x210 net/core/sock.c:2181 sk_alloc+0x38/0x370 net/core/sock.c:2234 bt_sock_alloc+0x3c/0x340 net/bluetooth/af_bluetooth.c:148 hci_sock_create+0xa1/0x190 net/bluetooth/hci_sock.c:2202 bt_sock_create+0x161/0x230 net/bluetooth/af_bluetooth.c:132 __sock_create+0x4c0/0xa30 net/socket.c:1571 sock_create net/socket.c:1629 [inline] __sys_socket_create net/socket.c:1666 [inline] __sys_socket+0x150/0x3c0 net/socket.c:1713 __do_sys_socket net/socket.c:1727 [inline] __se_sys_socket net/socket.c:1725 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1725 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 10375: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:582 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x59/0x70 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+0x196/0x430 mm/slub.c:4761 sk_prot_free net/core/sock.c:2217 [inline] __sk_destruct+0x479/0x5f0 net/core/sock.c:2309 sock_put include/net/sock.h:1913 [inline] mgmt_pending_free net/bluetooth/mgmt_util.c:307 [inline] mgmt_pending_remove+0x13e/0x1a0 net/bluetooth/mgmt_util.c:315 mgmt_pending_foreach+0xd1/0x130 net/bluetooth/mgmt_util.c:259 mgmt_index_removed+0x133/0x390 net/bluetooth/mgmt.c:9517 hci_sock_bind+0xcce/0x1150 net/bluetooth/hci_sock.c:1307 __sys_bind_socket net/socket.c:1840 [inline] __sys_bind+0x1e4/0x290 net/socket.c:1871 __do_sys_bind net/socket.c:1876 [inline] __se_sys_bind net/socket.c:1874 [inline] __x64_sys_bind+0x7a/0x90 net/socket.c:1874 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88807ce57000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1464 bytes inside of freed 2048-byte region [ffff88807ce57000, ffff88807ce57800) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7ce50 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 ffff88801ac42000 0000000000000000 dead000000000001 raw: 0000000000000000 0000000000080008 00000001f5000000 0000000000000000 head: 00fff00000000040 ffff88801ac42000 0000000000000000 dead000000000001 head: 0000000000000000 0000000000080008 00000001f5000000 0000000000000000 head: 00fff00000000003 ffffea0001f39401 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 0xd28c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5836, tgid 5836 (syz-executor), ts 91974563920, free_ts 91945523144 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1558 prep_new_page mm/page_alloc.c:1566 [inline] get_page_from_freelist+0x365c/0x37a0 mm/page_alloc.c:3476 __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4753 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2269 alloc_slab_page+0x6a/0x110 mm/slub.c:2423 allocate_slab+0x5a/0x2b0 mm/slub.c:2589 new_slab mm/slub.c:2642 [inline] ___slab_alloc+0xc27/0x14a0 mm/slub.c:3830 __slab_alloc+0x58/0xa0 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_track_caller_noprof+0x2e9/0x4c0 mm/slub.c:4317 kmalloc_reserve+0x111/0x2a0 net/core/skbuff.c:609 pskb_expand_head+0x1f0/0x1380 net/core/skbuff.c:2275 netlink_trim+0x1d6/0x2e0 net/netlink/af_netlink.c:1304 netlink_broadcast_filtered+0x76/0x12a0 net/netlink/af_netlink.c:1510 nlmsg_multicast_filtered include/net/netlink.h:1128 [inline] nlmsg_multicast include/net/netlink.h:1147 [inline] nlmsg_notify+0xfb/0x1c0 net/netlink/af_netlink.c:2586 rtnl_notify net/core/rtnetlink.c:952 [inline] rtmsg_ifinfo_send net/core/rtnetlink.c:4385 [inline] rtmsg_ifinfo_event net/core/rtnetlink.c:4401 [inline] rtnetlink_event+0x21d/0x260 net/core/rtnetlink.c:6971 notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85 page last free pid 8 tgid 8 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_unref_page+0xd3f/0x1010 mm/page_alloc.c:2659 __slab_free+0x2c2/0x380 mm/slub.c:4524 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4119 [inline] slab_alloc_node mm/slub.c:4168 [inline] kmem_cache_alloc_node_noprof+0x1d9/0x380 mm/slub.c:4220 __alloc_skb+0x1c3/0x440 net/core/skbuff.c:668 alloc_skb include/linux/skbuff.h:1331 [inline] alloc_skb_with_frags+0xc3/0x820 net/core/skbuff.c:6612 sock_alloc_send_pskb+0x91a/0xa60 net/core/sock.c:2897 sock_alloc_send_skb include/net/sock.h:1804 [inline] mld_newpack+0x1c3/0xaf0 net/ipv6/mcast.c:1790 add_grhead net/ipv6/mcast.c:1893 [inline] add_grec+0x1492/0x19a0 net/ipv6/mcast.c:2031 mld_send_cr net/ipv6/mcast.c:2157 [inline] mld_ifc_work+0x691/0xd90 net/ipv6/mcast.c:2697 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 Memory state around the buggy address: ffff88807ce57480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807ce57500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807ce57580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807ce57600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807ce57680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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