================================================================== 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 ffff88807ccd95b8 by task syz.1.484/7025 CPU: 0 UID: 0 PID: 7025 Comm: syz.1.484 Not tainted 6.12.0-rc2-syzkaller-00631-g6d858708d465 #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:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 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:1450 [inline] cmd_complete_rsp+0x114/0x180 net/bluetooth/mgmt.c:1470 mgmt_pending_foreach+0xd1/0x130 net/bluetooth/mgmt_util.c:259 __mgmt_power_off+0x183/0x430 net/bluetooth/mgmt.c:9474 hci_dev_close_sync+0x665/0x11a0 net/bluetooth/hci_sync.c:5191 hci_dev_do_close net/bluetooth/hci_core.c:483 [inline] hci_dev_close+0x112/0x210 net/bluetooth/hci_core.c:508 sock_do_ioctl+0x158/0x460 net/socket.c:1227 sock_ioctl+0x626/0x8e0 net/socket.c:1346 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893 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: 0033:0x7f012b57e719 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:00007f012c396038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f012b735f80 RCX: 00007f012b57e719 RDX: 0000000000000000 RSI: 00000000400448ca RDI: 0000000000000005 RBP: 00007f012b5f132e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f012b735f80 R15: 00007fffb577a1c8 Allocated by task 5556: 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:257 [inline] __do_kmalloc_node mm/slub.c:4264 [inline] __kmalloc_noprof+0x1fc/0x400 mm/slub.c:4276 kmalloc_noprof include/linux/slab.h:882 [inline] sk_prot_alloc+0xe0/0x210 net/core/sock.c:2162 sk_alloc+0x38/0x370 net/core/sock.c:2215 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+0x490/0x940 net/socket.c:1576 sock_create net/socket.c:1632 [inline] __sys_socket_create net/socket.c:1669 [inline] __sys_socket+0x150/0x3c0 net/socket.c:1716 __do_sys_socket net/socket.c:1730 [inline] __se_sys_socket net/socket.c:1728 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1728 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 7026: 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:579 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:230 [inline] slab_free_hook mm/slub.c:2342 [inline] slab_free mm/slub.c:4579 [inline] kfree+0x1a0/0x440 mm/slub.c:4727 sk_prot_free net/core/sock.c:2198 [inline] __sk_destruct+0x479/0x5f0 net/core/sock.c:2290 sock_put include/net/sock.h:1904 [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:9407 hci_sock_bind+0xcce/0x1150 net/bluetooth/hci_sock.c:1307 __sys_bind_socket net/socket.c:1843 [inline] __sys_bind+0x22d/0x2d0 net/socket.c:1867 __do_sys_bind net/socket.c:1875 [inline] __se_sys_bind net/socket.c:1873 [inline] __x64_sys_bind+0x7a/0x90 net/socket.c:1873 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 ffff88807ccd9000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1464 bytes inside of freed 2048-byte region [ffff88807ccd9000, ffff88807ccd9800) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88807ccdc000 pfn:0x7ccd8 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 ffff88801ac42000 ffff88801ac40948 ffffea0000c93410 raw: ffff88807ccdc000 0000000000080003 00000001f5000000 0000000000000000 head: 00fff00000000240 ffff88801ac42000 ffff88801ac40948 ffffea0000c93410 head: ffff88807ccdc000 0000000000080003 00000001f5000000 0000000000000000 head: 00fff00000000003 ffffea0001f33601 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 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4225, tgid 4225 (kworker/u8:9), ts 66788158705, free_ts 66660563471 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1545 [inline] get_page_from_freelist+0x3045/0x3190 mm/page_alloc.c:3457 __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4733 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265 alloc_slab_page+0x6a/0x120 mm/slub.c:2412 allocate_slab+0x5a/0x2f0 mm/slub.c:2578 new_slab mm/slub.c:2631 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3818 __slab_alloc+0x58/0xa0 mm/slub.c:3908 __slab_alloc_node mm/slub.c:3961 [inline] slab_alloc_node mm/slub.c:4122 [inline] __do_kmalloc_node mm/slub.c:4263 [inline] __kmalloc_node_track_caller_noprof+0x281/0x440 mm/slub.c:4283 kmalloc_reserve+0x111/0x2a0 net/core/skbuff.c:609 __alloc_skb+0x1f3/0x440 net/core/skbuff.c:678 alloc_skb include/linux/skbuff.h:1322 [inline] nlmsg_new include/net/netlink.h:1015 [inline] inet6_ifinfo_notify+0x72/0x120 net/ipv6/addrconf.c:6163 addrconf_notify+0xc6b/0x1020 net/ipv6/addrconf.c:3765 notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93 netdev_state_change+0x11f/0x1a0 net/core/dev.c:1378 linkwatch_do_dev+0x112/0x170 net/core/link_watch.c:177 page last free pid 5302 tgid 5302 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1108 [inline] free_unref_page+0xcfb/0xf20 mm/page_alloc.c:2638 discard_slab mm/slub.c:2677 [inline] __put_partials+0xeb/0x130 mm/slub.c:3145 put_cpu_partial+0x17c/0x250 mm/slub.c:3220 __slab_free+0x2ea/0x3d0 mm/slub.c:4449 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:247 [inline] slab_post_alloc_hook mm/slub.c:4085 [inline] slab_alloc_node mm/slub.c:4134 [inline] kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:4141 getname_flags+0xb7/0x540 fs/namei.c:139 do_sys_openat2+0xd2/0x1d0 fs/open.c:1409 do_sys_open fs/open.c:1430 [inline] __do_sys_openat fs/open.c:1446 [inline] __se_sys_openat fs/open.c:1441 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1441 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 Memory state around the buggy address: ffff88807ccd9480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807ccd9500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807ccd9580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807ccd9600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807ccd9680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================