================================================================== BUG: KASAN: use-after-free in css_task_iter_advance+0x49b/0x540 kernel/cgroup/cgroup.c:4507 Read of size 4 at addr ffff88808d993924 by task syz-executor.4/25632 CPU: 0 PID: 25632 Comm: syz-executor.4 Not tainted 5.2.0-rc3-next-20190605 #9 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+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.cold+0xd4/0x306 mm/kasan/report.c:351 __kasan_report.cold+0x1b/0x36 mm/kasan/report.c:482 kasan_report+0x12/0x20 mm/kasan/common.c:614 __asan_report_load4_noabort+0x14/0x20 mm/kasan/generic_report.c:131 css_task_iter_advance+0x49b/0x540 kernel/cgroup/cgroup.c:4507 css_task_iter_start+0x18b/0x230 kernel/cgroup/cgroup.c:4543 pidlist_array_load+0x181/0xa80 kernel/cgroup/cgroup-v1.c:372 cgroup_pidlist_start+0x37e/0x4c0 kernel/cgroup/cgroup-v1.c:442 cgroup_seqfile_start+0xa4/0xd0 kernel/cgroup/cgroup.c:3752 kernfs_seq_start+0xdc/0x190 fs/kernfs/file.c:118 seq_read+0x2a7/0x1110 fs/seq_file.c:224 kernfs_fop_read+0xed/0x560 fs/kernfs/file.c:252 do_loop_readv_writev fs/read_write.c:714 [inline] do_loop_readv_writev fs/read_write.c:701 [inline] do_iter_read+0x4a4/0x660 fs/read_write.c:935 vfs_readv+0xf0/0x160 fs/read_write.c:997 kernel_readv fs/splice.c:359 [inline] default_file_splice_read+0x475/0x890 fs/splice.c:414 do_splice_to+0x127/0x180 fs/splice.c:877 splice_direct_to_actor+0x2d2/0x970 fs/splice.c:954 do_splice_direct+0x1da/0x2a0 fs/splice.c:1063 do_sendfile+0x597/0xd00 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1525 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0x1dd/0x220 fs/read_write.c:1511 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459279 Code: fd b7 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 b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f4c94a2ec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000459279 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000006 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000010001 R11: 0000000000000246 R12: 00007f4c94a2f6d4 R13: 00000000004c65f3 R14: 00000000004db2a8 R15: 00000000ffffffff Allocated by task 8983: save_stack+0x23/0x90 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_kmalloc mm/kasan/common.c:489 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:462 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:497 slab_post_alloc_hook mm/slab.h:444 [inline] slab_alloc mm/slab.c:3320 [inline] kmem_cache_alloc+0x11a/0x6f0 mm/slab.c:3482 getname_flags fs/namei.c:138 [inline] getname_flags+0xd6/0x5b0 fs/namei.c:128 getname fs/namei.c:209 [inline] do_rmdir+0xb8/0x420 fs/namei.c:3906 __do_sys_rmdir fs/namei.c:3957 [inline] __se_sys_rmdir fs/namei.c:3955 [inline] __x64_sys_rmdir+0x36/0x40 fs/namei.c:3955 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 8983: save_stack+0x23/0x90 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:451 kasan_slab_free+0xe/0x10 mm/kasan/common.c:459 __cache_free mm/slab.c:3426 [inline] kmem_cache_free+0x86/0x320 mm/slab.c:3692 putname+0xef/0x130 fs/namei.c:259 do_rmdir+0x179/0x420 fs/namei.c:3947 __do_sys_rmdir fs/namei.c:3957 [inline] __se_sys_rmdir fs/namei.c:3955 [inline] __x64_sys_rmdir+0x36/0x40 fs/namei.c:3955 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88808d992b80 which belongs to the cache names_cache of size 4096 The buggy address is located 3492 bytes inside of 4096-byte region [ffff88808d992b80, ffff88808d993b80) The buggy address belongs to the page: page:ffffea0002366480 refcount:1 mapcount:0 mapping:ffff8880aa594c40 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea0002878488 ffffea00025a5488 ffff8880aa594c40 raw: 0000000000000000 ffff88808d992b80 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808d993800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808d993880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88808d993900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88808d993980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808d993a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================