netlink: 'syz-executor3': attribute type 29 has an invalid length. netlink: 8 bytes leftover after parsing attributes in process `syz-executor3'. netlink: 'syz-executor3': attribute type 29 has an invalid length. netlink: 8 bytes leftover after parsing attributes in process `syz-executor3'. ================================================================== BUG: KASAN: use-after-free in ext4_data_block_valid+0x2d5/0x330 fs/ext4/block_validity.c:211 Read of size 8 at addr ffff8801c9fad750 by task syz-executor5/12996 CPU: 1 PID: 12996 Comm: syz-executor5 Not tainted 4.19.0-rc8-next-20181019+ #98 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+0x244/0x39d lib/dump_stack.c:113 print_address_description.cold.7+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.8+0x242/0x309 mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 ext4_data_block_valid+0x2d5/0x330 fs/ext4/block_validity.c:211 ext4_valid_extent fs/ext4/extents.c:380 [inline] ext4_valid_extent_entries fs/ext4/extents.c:410 [inline] __ext4_ext_check+0xc77/0x1330 fs/ext4/extents.c:465 ext4_ext_remove_space+0x27bf/0x5ad0 fs/ext4/extents.c:3000 ext4_ext_truncate+0x1cc/0x220 fs/ext4/extents.c:4543 ext4_truncate+0xe41/0x1650 fs/ext4/inode.c:4533 ext4_evict_inode+0xab6/0x1ad0 fs/ext4/inode.c:289 evict+0x4b9/0x980 fs/inode.c:558 iput_final fs/inode.c:1547 [inline] iput+0x674/0xa90 fs/inode.c:1573 dentry_unlink_inode+0x461/0x5e0 fs/dcache.c:360 __dentry_kill+0x44c/0x7a0 fs/dcache.c:552 dentry_kill+0xc9/0x680 fs/dcache.c:671 dput.part.25+0x660/0x860 fs/dcache.c:832 dput+0x15/0x20 fs/dcache.c:814 path_put+0x31/0x70 fs/namei.c:484 free_fs_struct+0x22/0x60 fs/fs_struct.c:90 exit_fs+0xf3/0x130 fs/fs_struct.c:107 do_exit+0xf4d/0x26d0 kernel/exit.c:863 do_group_exit+0x177/0x440 kernel/exit.c:970 get_signal+0x8a8/0x1970 kernel/signal.c:2517 do_signal+0x9c/0x21c0 arch/x86/kernel/signal.c:816 exit_to_usermode_loop+0x2e5/0x380 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457569 Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f4560850cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000072bfa8 RCX: 0000000000457569 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000072bfa8 RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000072bfac R13: 00007ffd069d172f R14: 00007f45608519c0 R15: 0000000000000001 Allocated by task 1: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490 kmem_cache_alloc+0x12e/0x730 mm/slab.c:3554 add_system_zone+0x2e5/0x5f0 fs/ext4/block_validity.c:85 ext4_setup_system_zone+0x208/0x520 fs/ext4/block_validity.c:169 ext4_fill_super+0x8180/0xdbb0 fs/ext4/super.c:4386 mount_bdev+0x314/0x3e0 fs/super.c:1356 ext4_mount+0x3c/0x50 fs/ext4/super.c:5895 legacy_get_tree+0x131/0x460 fs/fs_context.c:718 vfs_get_tree+0x1cb/0x5c0 fs/super.c:1795 do_new_mount fs/namespace.c:2648 [inline] do_mount+0x70c/0x1d90 fs/namespace.c:2974 ksys_mount+0x12d/0x140 fs/namespace.c:3190 do_mount_root+0x35/0x1d3 init/do_mounts.c:388 mount_block_root+0x39c/0x6ed init/do_mounts.c:417 mount_root+0x2d3/0x31a init/do_mounts.c:562 prepare_namespace+0x26c/0x2ab init/do_mounts.c:621 kernel_init_freeable+0x69b/0x6b9 init/main.c:1170 kernel_init+0x11/0x1ae init/main.c:1071 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Freed by task 13345: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kmem_cache_free+0x83/0x290 mm/slab.c:3760 ext4_release_system_zone+0x7c/0x110 fs/ext4/block_validity.c:187 ext4_setup_system_zone+0x3ef/0x520 fs/ext4/block_validity.c:151 ext4_remount+0x16fc/0x2980 fs/ext4/super.c:5340 legacy_reconfigure+0x14c/0x1c0 fs/fs_context.c:754 reconfigure_super+0x4c0/0xbb0 fs/super.c:982 do_remount fs/namespace.c:2419 [inline] do_mount+0x18b9/0x1d90 fs/namespace.c:2965 ksys_mount+0x12d/0x140 fs/namespace.c:3190 __do_sys_mount fs/namespace.c:3204 [inline] __se_sys_mount fs/namespace.c:3201 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3201 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8801c9fad738 which belongs to the cache ext4_system_zone of size 40 The buggy address is located 24 bytes inside of 40-byte region [ffff8801c9fad738, ffff8801c9fad760) The buggy address belongs to the page: page:ffffea000727eb40 count:1 mapcount:0 mapping:ffff8801d44d8180 index:0xffff8801c9fadfb9 flags: 0x2fffc0000000200(slab) raw: 02fffc0000000200 ffff8801d44ddf38 ffff8801d44ddf38 ffff8801d44d8180 raw: ffff8801c9fadfb9 ffff8801c9fad000 0000000100000006 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801c9fad600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801c9fad680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8801c9fad700: fc fc fc fc fc fc fc fb fb fb fb fb fc fc fb fb ^ ffff8801c9fad780: fb fb fb fc fc fb fb fb fb fb fc fc fb fb fb fb ffff8801c9fad800: fb fc fc fb fb fb fb fb fc fc fb fb fb fb fb fc ==================================================================