================================================================== BUG: KASAN: use-after-free in memcpy include/linux/string.h:345 [inline] BUG: KASAN: use-after-free in getname_kernel+0x123/0x370 fs/namei.c:241 Read of size 11 at addr ffff8801d8053310 by task syz-executor5/15925 CPU: 0 PID: 15925 Comm: syz-executor5 Not tainted 4.17.0+ #94 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1b9/0x294 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267 memcpy+0x23/0x50 mm/kasan/kasan.c:302 memcpy include/linux/string.h:345 [inline] getname_kernel+0x123/0x370 fs/namei.c:241 kern_path+0x1e/0x40 fs/namei.c:2410 lookup_bdev+0xfa/0x240 fs/block_dev.c:2084 blkdev_get_by_path+0x1f/0xe0 fs/block_dev.c:1687 btrfs_get_bdev_and_sb+0x38/0x300 fs/btrfs/volumes.c:392 btrfs_open_one_device fs/btrfs/volumes.c:695 [inline] open_fs_devices+0x6a5/0xc60 fs/btrfs/volumes.c:1112 btrfs_open_devices+0xc0/0xd0 fs/btrfs/volumes.c:1155 btrfs_mount_root+0x91f/0x1e70 fs/btrfs/super.c:1568 mount_fs+0xae/0x328 fs/super.c:1277 vfs_kern_mount.part.34+0xd4/0x4d0 fs/namespace.c:1037 vfs_kern_mount+0x40/0x60 fs/namespace.c:1027 btrfs_mount+0x4a1/0x213e fs/btrfs/super.c:1661 mount_fs+0xae/0x328 fs/super.c:1277 vfs_kern_mount.part.34+0xd4/0x4d0 fs/namespace.c:1037 vfs_kern_mount fs/namespace.c:1027 [inline] do_new_mount fs/namespace.c:2518 [inline] do_mount+0x564/0x30b0 fs/namespace.c:2848 ksys_mount+0x12d/0x140 fs/namespace.c:3064 __do_sys_mount fs/namespace.c:3078 [inline] __se_sys_mount fs/namespace.c:3075 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3075 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45842a Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 dd 8f fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 ba 8f fb ff c3 66 0f 1f 84 00 00 00 00 00 RSP: 002b:00007fe10e408ba8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000080 RCX: 000000000045842a RDX: 0000000020000080 RSI: 0000000020000100 RDI: 00007fe10e408bf0 RBP: 0000000000000001 R08: 0000000020000240 R09: 0000000020000080 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000014 R13: 0000000000000001 R14: 00000000004d2bc0 R15: 0000000000000000 Allocated by task 15908: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 __do_kmalloc mm/slab.c:3718 [inline] __kmalloc+0x14e/0x760 mm/slab.c:3727 kmalloc include/linux/slab.h:518 [inline] kzalloc include/linux/slab.h:706 [inline] rcu_string_strdup fs/btrfs/rcu-string.h:17 [inline] btrfs_prepare_close_one_device fs/btrfs/volumes.c:1031 [inline] close_fs_devices+0x497/0xfa0 fs/btrfs/volumes.c:1052 btrfs_close_devices+0x29/0x150 fs/btrfs/volumes.c:1085 open_ctree+0x589/0x7898 fs/btrfs/disk-io.c:3358 btrfs_fill_super fs/btrfs/super.c:1202 [inline] btrfs_mount_root+0x16df/0x1e70 fs/btrfs/super.c:1593 mount_fs+0xae/0x328 fs/super.c:1277 vfs_kern_mount.part.34+0xd4/0x4d0 fs/namespace.c:1037 vfs_kern_mount+0x40/0x60 fs/namespace.c:1027 btrfs_mount+0x4a1/0x213e fs/btrfs/super.c:1661 mount_fs+0xae/0x328 fs/super.c:1277 vfs_kern_mount.part.34+0xd4/0x4d0 fs/namespace.c:1037 vfs_kern_mount fs/namespace.c:1027 [inline] do_new_mount fs/namespace.c:2518 [inline] do_mount+0x564/0x30b0 fs/namespace.c:2848 ksys_mount+0x12d/0x140 fs/namespace.c:3064 __do_sys_mount fs/namespace.c:3078 [inline] __se_sys_mount fs/namespace.c:3075 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3075 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 15922: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xd9/0x260 mm/slab.c:3813 __rcu_reclaim kernel/rcu/rcu.h:173 [inline] rcu_do_batch kernel/rcu/tree.c:2558 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2818 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2785 [inline] rcu_process_callbacks+0xfc5/0x1760 kernel/rcu/tree.c:2802 __do_softirq+0x2e0/0xaf5 kernel/softirq.c:284 The buggy address belongs to the object at ffff8801d8053300 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 16 bytes inside of 32-byte region [ffff8801d8053300, ffff8801d8053320) The buggy address belongs to the page: page:ffffea00076014c0 count:1 mapcount:0 mapping:ffff8801da8001c0 index:0xffff8801d8053fc1 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea00075f2f08 ffffea00075a9a08 ffff8801da8001c0 raw: ffff8801d8053fc1 ffff8801d8053000 0000000100000011 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d8053200: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff8801d8053280: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc >ffff8801d8053300: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ^ ffff8801d8053380: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff8801d8053400: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ==================================================================