================================================================== BUG: KASAN: slab-use-after-free in sk_filter_trim_cap+0x284/0xac0 net/core/filter.c:156 Read of size 8 at addr ffff88805b028178 by task syz.1.1310/10790 CPU: 0 UID: 0 PID: 10790 Comm: syz.1.1310 Not tainted 6.14.0-syzkaller-05884-g2ea396448f26 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 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:408 [inline] print_report+0x16e/0x5b0 mm/kasan/report.c:521 kasan_report+0x143/0x180 mm/kasan/report.c:634 sk_filter_trim_cap+0x284/0xac0 net/core/filter.c:156 sk_filter include/linux/filter.h:1062 [inline] sock_queue_rcv_skb_reason+0x28/0xf0 net/core/sock.c:527 sock_queue_rcv_skb include/net/sock.h:2397 [inline] mgmt_cmd_status+0x28d/0x4d0 net/bluetooth/mgmt_util.c:156 cmd_status_rsp net/bluetooth/mgmt.c:1464 [inline] cmd_complete_rsp+0x114/0x180 net/bluetooth/mgmt.c:1484 mgmt_pending_foreach+0xd1/0x130 net/bluetooth/mgmt_util.c:242 __mgmt_power_off+0x18b/0x440 net/bluetooth/mgmt.c:9429 hci_dev_close_sync+0x701/0x1260 net/bluetooth/hci_sync.c:5221 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+0x15a/0x490 net/socket.c:1190 sock_ioctl+0x644/0x900 net/socket.c:1311 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f0e3398d169 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:00007f0e34845038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f0e33ba5fa0 RCX: 00007f0e3398d169 RDX: 0000000000000000 RSI: 00000000400448ca RDI: 0000000000000007 RBP: 00007f0e33a0e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f0e33ba5fa0 R15: 00007ffdc0fc0738 Allocated by task 10718: 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+0x9d/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4318 [inline] __kmalloc_noprof+0x28e/0x4d0 mm/slub.c:4330 kmalloc_noprof include/linux/slab.h:906 [inline] sk_prot_alloc+0xe0/0x210 net/core/sock.c:2196 sk_alloc+0x3e/0x370 net/core/sock.c:2249 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:1541 sock_create net/socket.c:1599 [inline] __sys_socket_create net/socket.c:1636 [inline] __sys_socket+0x14d/0x3c0 net/socket.c:1683 __do_sys_socket net/socket.c:1697 [inline] __se_sys_socket net/socket.c:1695 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1695 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 10792: 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:576 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:2376 [inline] slab_free mm/slub.c:4633 [inline] kfree+0x198/0x430 mm/slub.c:4832 sk_prot_free net/core/sock.c:2232 [inline] __sk_destruct+0x50c/0x690 net/core/sock.c:2327 sock_put include/net/sock.h:1908 [inline] mgmt_pending_free net/bluetooth/mgmt_util.c:290 [inline] mgmt_pending_remove+0x13e/0x1a0 net/bluetooth/mgmt_util.c:298 mgmt_pending_foreach+0xd1/0x130 net/bluetooth/mgmt_util.c:242 mgmt_index_removed+0x135/0x3a0 net/bluetooth/mgmt.c:9362 hci_sock_bind+0xd74/0x12d0 net/bluetooth/hci_sock.c:1307 __sys_bind_socket net/socket.c:1810 [inline] __sys_bind+0x1de/0x290 net/socket.c:1841 __do_sys_bind net/socket.c:1846 [inline] __se_sys_bind net/socket.c:1844 [inline] __x64_sys_bind+0x7a/0x90 net/socket.c:1844 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88805b028000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 376 bytes inside of freed 2048-byte region [ffff88805b028000, ffff88805b028800) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5b028 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 ffffea0001732400 dead000000000002 raw: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801b042000 ffffea0001732400 dead000000000002 head: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000 head: 00fff00000000003 ffffea00016c0a01 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5196, tgid 5196 (klogd), ts 74906724515, free_ts 25949858424 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1551 prep_new_page mm/page_alloc.c:1559 [inline] get_page_from_freelist+0x3695/0x37e0 mm/page_alloc.c:3477 __alloc_frozen_pages_noprof+0x2c5/0x7b0 mm/page_alloc.c:4740 alloc_pages_mpol+0x339/0x690 mm/mempolicy.c:2301 alloc_slab_page mm/slub.c:2446 [inline] allocate_slab+0x8f/0x3a0 mm/slub.c:2610 new_slab mm/slub.c:2663 [inline] ___slab_alloc+0xc3b/0x1500 mm/slub.c:3849 __slab_alloc+0x58/0xa0 mm/slub.c:3939 __slab_alloc_node mm/slub.c:4014 [inline] slab_alloc_node mm/slub.c:4175 [inline] __kmalloc_cache_noprof+0x26a/0x370 mm/slub.c:4344 kmalloc_noprof include/linux/slab.h:902 [inline] syslog_print+0x112/0x620 kernel/printk/printk.c:1607 do_syslog+0x3b7/0x830 kernel/printk/printk.c:1785 __do_sys_syslog kernel/printk/printk.c:1877 [inline] __se_sys_syslog kernel/printk/printk.c:1875 [inline] __x64_sys_syslog+0x7c/0x90 kernel/printk/printk.c:1875 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 1 tgid 1 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_frozen_pages+0xe16/0x10f0 mm/page_alloc.c:2660 free_contig_range+0x152/0x430 mm/page_alloc.c:6678 destroy_args+0x94/0x4b0 mm/debug_vm_pgtable.c:1017 debug_vm_pgtable+0x555/0x590 mm/debug_vm_pgtable.c:1397 do_one_initcall+0x24a/0x940 init/main.c:1257 do_initcall_level+0x157/0x210 init/main.c:1319 do_initcalls+0x71/0xd0 init/main.c:1335 kernel_init_freeable+0x432/0x5d0 init/main.c:1567 kernel_init+0x1d/0x2b0 init/main.c:1457 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffff88805b028000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805b028080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88805b028100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805b028180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805b028200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================