================================================================== BUG: KASAN: slab-use-after-free in l2cap_sock_new_connection_cb+0x22a/0x240 net/bluetooth/l2cap_sock.c:1483 Read of size 8 at addr ffff888059734580 by task kworker/u9:4/5832 CPU: 1 UID: 0 PID: 5832 Comm: kworker/u9:4 Not tainted 6.12.0-rc7-syzkaller-00070-g0a9b9d17f3a7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 Workqueue: hci3 hci_rx_work 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:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 l2cap_sock_new_connection_cb+0x22a/0x240 net/bluetooth/l2cap_sock.c:1483 l2cap_connect_cfm+0x4c9/0xf80 net/bluetooth/l2cap_core.c:7261 hci_connect_cfm include/net/bluetooth/hci_core.h:1960 [inline] le_conn_complete_evt+0x1662/0x1d80 net/bluetooth/hci_event.c:5758 hci_le_conn_complete_evt+0x23c/0x370 net/bluetooth/hci_event.c:5784 hci_le_meta_evt+0x2e2/0x5d0 net/bluetooth/hci_event.c:7132 hci_event_func net/bluetooth/hci_event.c:7440 [inline] hci_event_packet+0x666/0x1180 net/bluetooth/hci_event.c:7495 hci_rx_work+0x2c6/0x16c0 net/bluetooth/hci_core.c:4031 process_one_work+0x9c5/0x1ba0 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 Allocated by task 5832: 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:257 [inline] __do_kmalloc_node mm/slub.c:4264 [inline] __kmalloc_noprof+0x1e8/0x400 mm/slub.c:4276 kmalloc_noprof include/linux/slab.h:882 [inline] sk_prot_alloc+0x1a8/0x2a0 net/core/sock.c:2164 sk_alloc+0x36/0xb90 net/core/sock.c:2217 bt_sock_alloc+0x3b/0x3a0 net/bluetooth/af_bluetooth.c:148 l2cap_sock_alloc.constprop.0+0x35/0x180 net/bluetooth/l2cap_sock.c:1877 l2cap_sock_new_connection_cb+0x101/0x240 net/bluetooth/l2cap_sock.c:1468 l2cap_connect_cfm+0x4c9/0xf80 net/bluetooth/l2cap_core.c:7261 hci_connect_cfm include/net/bluetooth/hci_core.h:1960 [inline] le_conn_complete_evt+0x1662/0x1d80 net/bluetooth/hci_event.c:5758 hci_le_conn_complete_evt+0x23c/0x370 net/bluetooth/hci_event.c:5784 hci_le_meta_evt+0x2e2/0x5d0 net/bluetooth/hci_event.c:7132 hci_event_func net/bluetooth/hci_event.c:7440 [inline] hci_event_packet+0x666/0x1180 net/bluetooth/hci_event.c:7495 hci_rx_work+0x2c6/0x16c0 net/bluetooth/hci_core.c:4031 process_one_work+0x9c5/0x1ba0 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 6266: 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:579 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:230 [inline] slab_free_hook mm/slub.c:2342 [inline] slab_free mm/slub.c:4579 [inline] kfree+0x14f/0x4b0 mm/slub.c:4727 sk_prot_free net/core/sock.c:2200 [inline] __sk_destruct+0x5eb/0x720 net/core/sock.c:2292 sk_destruct+0xc2/0xf0 net/core/sock.c:2307 __sk_free+0xf4/0x3e0 net/core/sock.c:2318 sk_free+0x6a/0x90 net/core/sock.c:2329 sock_put include/net/sock.h:1888 [inline] l2cap_sock_kill net/bluetooth/l2cap_sock.c:1250 [inline] l2cap_sock_kill+0x171/0x2d0 net/bluetooth/l2cap_sock.c:1235 l2cap_sock_cleanup_listen+0x3d/0x2a0 net/bluetooth/l2cap_sock.c:1448 l2cap_sock_release+0x5c/0x210 net/bluetooth/l2cap_sock.c:1411 __sock_release+0xb0/0x270 net/socket.c:658 sock_close+0x1c/0x30 net/socket.c:1426 __fput+0x3f6/0xb60 fs/file_table.c:431 task_work_run+0x14e/0x250 kernel/task_work.c:239 get_signal+0x1ca/0x2770 kernel/signal.c:2691 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888059734000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1408 bytes inside of freed 2048-byte region [ffff888059734000, ffff888059734800) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x59730 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 ffff88801b042000 dead000000000100 dead000000000122 raw: 0000000000000000 0000000080080008 00000001f5000000 0000000000000000 head: 00fff00000000040 ffff88801b042000 dead000000000100 dead000000000122 head: 0000000000000000 0000000080080008 00000001f5000000 0000000000000000 head: 00fff00000000003 ffffea000165cc01 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 5830, tgid 5830 (syz-executor), ts 59361501571, free_ts 59360716544 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1556 prep_new_page mm/page_alloc.c:1564 [inline] get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3474 __alloc_pages_noprof+0x223/0x25a0 mm/page_alloc.c:4750 alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2265 alloc_slab_page mm/slub.c:2412 [inline] allocate_slab mm/slub.c:2578 [inline] new_slab+0x2c9/0x410 mm/slub.c:2631 ___slab_alloc+0xdac/0x1880 mm/slub.c:3818 __slab_alloc.constprop.0+0x56/0xb0 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+0x355/0x430 mm/slub.c:4283 kmalloc_reserve+0xef/0x2c0 net/core/skbuff.c:609 pskb_expand_head+0x243/0x1260 net/core/skbuff.c:2275 netlink_trim+0x1ef/0x250 net/netlink/af_netlink.c:1313 netlink_unicast+0xc6/0x7f0 net/netlink/af_netlink.c:1347 nlmsg_unicast include/net/netlink.h:1158 [inline] genlmsg_unicast include/net/genetlink.h:549 [inline] genlmsg_reply include/net/genetlink.h:559 [inline] ctrl_getfamily+0x40b/0x540 net/netlink/genetlink.c:1473 genl_family_rcv_msg_doit+0x202/0x2f0 net/netlink/genetlink.c:1115 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0x565/0x800 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2551 page last free pid 5200 tgid 5200 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:2657 __put_partials+0x14c/0x170 mm/slub.c:3145 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4e/0x120 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x192/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 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_node_noprof+0x153/0x310 mm/slub.c:4186 __alloc_skb+0x2b1/0x380 net/core/skbuff.c:668 alloc_skb include/linux/skbuff.h:1322 [inline] netlink_alloc_large_skb+0x69/0x130 net/netlink/af_netlink.c:1206 netlink_sendmsg+0x689/0xd70 net/netlink/af_netlink.c:1876 sock_sendmsg_nosec net/socket.c:729 [inline] __sock_sendmsg net/socket.c:744 [inline] ____sys_sendmsg+0xaaf/0xc90 net/socket.c:2607 ___sys_sendmsg+0x135/0x1e0 net/socket.c:2661 __sys_sendmsg+0x117/0x1f0 net/socket.c:2690 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 Memory state around the buggy address: ffff888059734480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888059734500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888059734580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888059734600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888059734680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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