Hello, syzbot found the following issue on: HEAD commit: a940d9a43e62 Merge tag 'soc-arm-6.12' of git://git.kernel... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11959677980000 kernel config: https://syzkaller.appspot.com/x/.config?x=44d46e514184cd24 dashboard link: https://syzkaller.appspot.com/bug?extid=b70293d0c3fc68076e49 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-a940d9a4.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e9929bfe422c/vmlinux-a940d9a4.xz kernel image: https://storage.googleapis.com/syzbot-assets/a6c74ee261ed/bzImage-a940d9a4.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b70293d0c3fc68076e49@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KASAN: slab-use-after-free in sco_chan_del+0x460/0x4b0 net/bluetooth/sco.c:174 Read of size 8 at addr ffff88802a8f5600 by task syz.0.1372/8986 CPU: 3 UID: 0 PID: 8986 Comm: syz.0.1372 Not tainted 6.11.0-syzkaller-03917-ga940d9a43e62 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: <TASK> __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:119 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 sco_chan_del+0x460/0x4b0 net/bluetooth/sco.c:174 __sco_sock_close+0xf2/0x640 net/bluetooth/sco.c:459 sco_sock_close net/bluetooth/sco.c:474 [inline] sco_sock_release+0x6f/0x2d0 net/bluetooth/sco.c:1249 __sock_release+0xb0/0x270 net/socket.c:659 sock_close+0x1c/0x30 net/socket.c:1427 __fput+0x3f6/0xb60 fs/file_table.c:431 task_work_run+0x14e/0x250 kernel/task_work.c:228 get_signal+0x1ca/0x2770 kernel/signal.c:2690 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:310 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 RIP: 0033:0x7f6f8957def9 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:00007f6f8a362038 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: fffffffffffffffc RBX: 00007f6f89736058 RCX: 00007f6f8957def9 RDX: 0000000000000008 RSI: 0000000020000040 RDI: 0000000000000005 RBP: 00007f6f895f0b76 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007f6f89736058 R15: 00007fff399424c8 </TASK> Allocated by task 8722: 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:370 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387 kmalloc_noprof include/linux/slab.h:690 [inline] kzalloc_noprof include/linux/slab.h:816 [inline] sco_conn_add.part.0+0x43/0x2d0 net/bluetooth/sco.c:137 sco_conn_add net/bluetooth/sco.c:266 [inline] sco_connect net/bluetooth/sco.c:278 [inline] sco_sock_connect+0x6c9/0xb00 net/bluetooth/sco.c:596 __sys_connect_file+0x14d/0x190 net/socket.c:2067 __sys_connect+0x149/0x170 net/socket.c:2084 __do_sys_connect net/socket.c:2094 [inline] __se_sys_connect net/socket.c:2091 [inline] __x64_sys_connect+0x72/0xb0 net/socket.c:2091 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 Freed by task 5343: 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+0xf7/0x160 mm/kasan/common.c:240 __kasan_slab_free+0x32/0x50 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2250 [inline] slab_free mm/slub.c:4474 [inline] kfree+0x12a/0x3b0 mm/slub.c:4595 sco_conn_del+0x1d4/0x2a0 net/bluetooth/sco.c:214 sco_connect_cfm+0x257/0xc10 net/bluetooth/sco.c:1364 hci_connect_cfm include/net/bluetooth/hci_core.h:1960 [inline] hci_conn_failed+0x1c3/0x340 net/bluetooth/hci_conn.c:1262 hci_abort_conn_sync+0x75a/0xb50 net/bluetooth/hci_sync.c:5586 abort_conn_sync+0x197/0x360 net/bluetooth/hci_conn.c:2914 hci_cmd_sync_work+0x1a4/0x410 net/bluetooth/hci_sync.c:328 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3393 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 The buggy address belongs to the object at ffff88802a8f5600 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 0 bytes inside of freed 256-byte region [ffff88802a8f5600, ffff88802a8f5700) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2a8f4 head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 00fff00000000040 ffff88801ac42b40 ffffea0000a54280 dead000000000004 raw: 0000000000000000 0000000000100010 00000001fdffffff 0000000000000000 head: 00fff00000000040 ffff88801ac42b40 ffffea0000a54280 dead000000000004 head: 0000000000000000 0000000000100010 00000001fdffffff 0000000000000000 head: 00fff00000000001 ffffea0000aa3d01 ffffffffffffffff 0000000000000000 head: 0000000000000002 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0x1d2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 5431, tgid 5429 (syz.2.13), ts 54219801688, free_ts 53733128813 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1500 prep_new_page mm/page_alloc.c:1508 [inline] get_page_from_freelist+0x1351/0x2e50 mm/page_alloc.c:3446 __alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4702 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x4e/0xf0 mm/slub.c:2319 allocate_slab mm/slub.c:2482 [inline] new_slab+0x84/0x260 mm/slub.c:2535 ___slab_alloc+0xdac/0x1870 mm/slub.c:3721 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3811 __slab_alloc_node mm/slub.c:3864 [inline] slab_alloc_node mm/slub.c:4026 [inline] __do_kmalloc_node mm/slub.c:4158 [inline] __kmalloc_noprof+0x367/0x400 mm/slub.c:4171 kmalloc_noprof include/linux/slab.h:694 [inline] kmalloc_array_noprof include/linux/slab.h:735 [inline] security_inode_init_security+0x140/0x390 security/security.c:1823 shmem_mknod+0xe9/0x240 mm/shmem.c:3432 shmem_mkdir+0x31/0x60 mm/shmem.c:3486 vfs_mkdir+0x57d/0x860 fs/namei.c:4257 do_mkdirat+0x301/0x3a0 fs/namei.c:4280 __do_sys_mkdirat fs/namei.c:4295 [inline] __se_sys_mkdirat fs/namei.c:4293 [inline] __x64_sys_mkdirat+0x83/0xb0 fs/namei.c:4293 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 page last free pid 5340 tgid 5340 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1101 [inline] free_unref_page+0x64a/0xe40 mm/page_alloc.c:2619 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4e/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x192/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3989 [inline] slab_alloc_node mm/slub.c:4038 [inline] __do_kmalloc_node mm/slub.c:4158 [inline] __kmalloc_node_noprof+0x1c3/0x430 mm/slub.c:4165 __kvmalloc_node_noprof+0x9d/0x1a0 mm/util.c:650 xt_jumpstack_alloc net/netfilter/x_tables.c:1355 [inline] xt_replace_table+0x1c7/0x910 net/netfilter/x_tables.c:1394 __do_replace+0x1d9/0x9c0 net/ipv4/netfilter/arp_tables.c:912 do_replace net/ipv6/netfilter/ip6_tables.c:1158 [inline] do_ip6t_set_ctl+0x94b/0xc40 net/ipv6/netfilter/ip6_tables.c:1644 nf_setsockopt+0x8a/0xf0 net/netfilter/nf_sockopt.c:101 ipv6_setsockopt+0x135/0x170 net/ipv6/ipv6_sockglue.c:998 tcp_setsockopt+0xa4/0x100 net/ipv4/tcp.c:4029 do_sock_setsockopt+0x222/0x480 net/socket.c:2330 __sys_setsockopt+0x1a4/0x270 net/socket.c:2353 __do_sys_setsockopt net/socket.c:2362 [inline] __se_sys_setsockopt net/socket.c:2359 [inline] __x64_sys_setsockopt+0xbd/0x160 net/socket.c:2359 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 Memory state around the buggy address: ffff88802a8f5500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802a8f5580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88802a8f5600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802a8f5680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802a8f5700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
