================================================================== BUG: KASAN: slab-use-after-free in sk_filter_trim_cap+0x284/0xac0 net/core/filter.c:156 Read of size 8 at addr ffff88802dbb1178 by task syz.4.362/7362 CPU: 1 UID: 0 PID: 7362 Comm: syz.4.362 Not tainted 6.15.0-rc2-syzkaller-00577-g8066e388be48 #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:1079 [inline] sock_queue_rcv_skb_reason+0x28/0xf0 net/core/sock.c:527 sock_queue_rcv_skb include/net/sock.h:2432 [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+0x152/0x400 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+0xf3/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4d0fb8e169 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:00007f4d0d9f6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f4d0fdb5fa0 RCX: 00007f4d0fb8e169 RDX: 0000000000000000 RSI: 00000000400448ca RDI: 0000000000000006 RBP: 00007f4d0fc10a68 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f4d0fdb5fa0 R15: 00007ffe82a5f918 Allocated by task 6551: 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:4341 [inline] __kmalloc_noprof+0x28e/0x4d0 mm/slub.c:4353 kmalloc_noprof include/linux/slab.h:909 [inline] sk_prot_alloc+0xe0/0x210 net/core/sock.c:2198 sk_alloc+0x3e/0x370 net/core/sock.c:2254 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+0xf3/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 7364: 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:2398 [inline] slab_free mm/slub.c:4656 [inline] kfree+0x198/0x430 mm/slub.c:4855 sk_prot_free net/core/sock.c:2237 [inline] __sk_destruct+0x4ce/0x650 net/core/sock.c:2332 sock_put include/net/sock.h:1943 [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+0xf3/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88802dbb1000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 376 bytes inside of freed 2048-byte region [ffff88802dbb1000, ffff88802dbb1800) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88802dbb2000 pfn:0x2dbb0 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 ffff88801b042000 ffffea0001752810 ffffea000088f010 raw: ffff88802dbb2000 0000000000080006 00000000f5000000 0000000000000000 head: 00fff00000000240 ffff88801b042000 ffffea0001752810 ffffea000088f010 head: ffff88802dbb2000 0000000000080006 00000000f5000000 0000000000000000 head: 00fff00000000003 ffffea0000b6ec01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 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 197, tgid 197 (kworker/u8:5), ts 95849196765, free_ts 95809556787 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1714 prep_new_page mm/page_alloc.c:1722 [inline] get_page_from_freelist+0x361c/0x37c0 mm/page_alloc.c:3696 __alloc_frozen_pages_noprof+0x211/0x5b0 mm/page_alloc.c:4978 alloc_pages_mpol+0x339/0x690 mm/mempolicy.c:2301 alloc_slab_page mm/slub.c:2468 [inline] allocate_slab+0x8f/0x3b0 mm/slub.c:2632 new_slab mm/slub.c:2686 [inline] ___slab_alloc+0xc3b/0x1500 mm/slub.c:3872 __slab_alloc+0x58/0xa0 mm/slub.c:3962 __slab_alloc_node mm/slub.c:4037 [inline] slab_alloc_node mm/slub.c:4198 [inline] __do_kmalloc_node mm/slub.c:4340 [inline] __kmalloc_node_track_caller_noprof+0x2ef/0x4d0 mm/slub.c:4360 kmalloc_reserve+0x111/0x2a0 net/core/skbuff.c:599 pskb_expand_head+0x1fd/0x1510 net/core/skbuff.c:2235 netlink_trim+0x1d6/0x2e0 net/netlink/af_netlink.c:1295 netlink_broadcast_filtered+0x76/0x12a0 net/netlink/af_netlink.c:1501 nlmsg_multicast_filtered include/net/netlink.h:1145 [inline] nlmsg_multicast include/net/netlink.h:1164 [inline] nlmsg_notify+0xfb/0x1c0 net/netlink/af_netlink.c:2577 netif_state_change+0x145/0x1b0 net/core/dev.c:1584 linkwatch_do_dev+0x112/0x170 net/core/link_watch.c:186 __linkwatch_run_queue+0x63b/0x940 net/core/link_watch.c:244 page last free pid 5892 tgid 5892 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1258 [inline] __free_frozen_pages+0xdee/0x10b0 mm/page_alloc.c:2721 discard_slab mm/slub.c:2730 [inline] __put_partials+0x160/0x1c0 mm/slub.c:3199 put_cpu_partial+0x17e/0x250 mm/slub.c:3274 __slab_free+0x294/0x390 mm/slub.c:4526 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:4161 [inline] slab_alloc_node mm/slub.c:4210 [inline] __do_kmalloc_node mm/slub.c:4340 [inline] __kmalloc_noprof+0x238/0x4d0 mm/slub.c:4353 kmalloc_noprof include/linux/slab.h:909 [inline] tomoyo_realpath_from_path+0xcf/0x5e0 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_check_open_permission+0x25a/0x4f0 security/tomoyo/file.c:771 security_file_open+0xac/0x250 security/security.c:3114 do_dentry_open+0x320/0x1960 fs/open.c:933 vfs_open+0x3b/0x370 fs/open.c:1086 do_open fs/namei.c:3845 [inline] path_openat+0x2caf/0x35d0 fs/namei.c:4004 do_filp_open+0x284/0x4e0 fs/namei.c:4031 do_sys_openat2+0x12b/0x1d0 fs/open.c:1429 Memory state around the buggy address: ffff88802dbb1000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802dbb1080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88802dbb1100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802dbb1180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802dbb1200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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