syzbot has found a reproducer for the following issue on: HEAD commit: a409ed15 Merge tag 'gpio-v5.11-1' of git://git.kernel.org/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=174778a7500000 kernel config: https://syzkaller.appspot.com/x/.config?x=20efebc728efc8ff dashboard link: https://syzkaller.appspot.com/bug?extid=9a0875bc1b2ca466b484 compiler: gcc (GCC) 10.1.0-syz 20200507 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10a4445b500000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9a0875bc1b2ca466b484@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KASAN: slab-out-of-bounds in __lock_acquire+0x3da6/0x54b0 kernel/locking/lockdep.c:4702 Read of size 8 at addr ffff88801938c0a0 by task kworker/1:1/34 CPU: 1 PID: 34 Comm: kworker/1:1 Not tainted 5.10.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events l2cap_chan_timeout Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0xae/0x497 mm/kasan/report.c:385 __kasan_report mm/kasan/report.c:545 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:562 __lock_acquire+0x3da6/0x54b0 kernel/locking/lockdep.c:4702 lock_acquire kernel/locking/lockdep.c:5437 [inline] lock_acquire+0x29d/0x750 kernel/locking/lockdep.c:5402 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline] _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:175 spin_lock_bh include/linux/spinlock.h:359 [inline] lock_sock_nested+0x3b/0x110 net/core/sock.c:3049 l2cap_sock_teardown_cb+0xa1/0x660 net/bluetooth/l2cap_sock.c:1520 l2cap_chan_del+0xbc/0xaa0 net/bluetooth/l2cap_core.c:618 l2cap_chan_close+0x1bc/0xaf0 net/bluetooth/l2cap_core.c:823 l2cap_chan_timeout+0x17e/0x2f0 net/bluetooth/l2cap_core.c:436 process_one_work+0x98d/0x1630 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Allocated by task 11222: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461 __do_kmalloc mm/slab.c:3659 [inline] __kmalloc+0x18b/0x340 mm/slab.c:3668 kmalloc include/linux/slab.h:557 [inline] kzalloc include/linux/slab.h:682 [inline] tomoyo_get_name+0x22b/0x4c0 security/tomoyo/memory.c:173 tomoyo_parse_name_union+0xbc/0x160 security/tomoyo/util.c:260 tomoyo_update_path_acl security/tomoyo/file.c:395 [inline] tomoyo_write_file+0x4c0/0x7f0 security/tomoyo/file.c:1022 tomoyo_write_domain2+0x116/0x1d0 security/tomoyo/common.c:1152 tomoyo_add_entry security/tomoyo/common.c:2042 [inline] tomoyo_supervisor+0xbee/0xf20 security/tomoyo/common.c:2103 tomoyo_audit_path_log security/tomoyo/file.c:168 [inline] tomoyo_path_permission security/tomoyo/file.c:587 [inline] tomoyo_path_permission+0x270/0x3a0 security/tomoyo/file.c:573 tomoyo_path_perm+0x37c/0x3f0 security/tomoyo/file.c:838 tomoyo_path_symlink+0x94/0xe0 security/tomoyo/tomoyo.c:200 security_path_symlink+0xdf/0x150 security/security.c:1111 do_symlinkat+0x123/0x2c0 fs/namei.c:3985 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff88801938c000 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 32 bytes to the right of 128-byte region [ffff88801938c000, ffff88801938c080) The buggy address belongs to the page: page:00000000b7b67fec refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1938c flags: 0xfff00000000200(slab) raw: 00fff00000000200 ffffea00004e6508 ffffea0000a5cf48 ffff888010840400 raw: 0000000000000000 ffff88801938c000 0000000100000010 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88801938bf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801938c000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88801938c080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88801938c100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88801938c180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================
