Node 0 active_anon:1939960kB inactive_anon:764kB active_file:136kB inactive_file:100kB unevictable:0kB isolated(anon):0kB isolated(file):80kB mapped:209044kB dirty:96kB writeback:44kB shmem:996kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 925696kB writeback_tmp:0kB unstable:0kB all_unreclaimable? no 0 pages cma reserved ================================================================== BUG: KASAN: use-after-free in ceph_destroy_options+0xda/0x100 net/ceph/ceph_common.c:283 Read of size 8 at addr ffff888074a83610 by task syz-executor.1/19489 CPU: 0 PID: 19489 Comm: syz-executor.1 Not tainted 4.14.172-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x13e/0x194 lib/dump_stack.c:58 print_address_description.cold+0x7c/0x1e2 mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report mm/kasan/report.c:409 [inline] kasan_report.cold+0xa9/0x2ae mm/kasan/report.c:393 ceph_destroy_options+0xda/0x100 net/ceph/ceph_common.c:283 ceph_mount+0xbc7/0x164d fs/ceph/super.c:1018 mount_fs+0x92/0x2a0 fs/super.c:1237 vfs_kern_mount.part.0+0x5b/0x3c0 fs/namespace.c:1046 vfs_kern_mount fs/namespace.c:1036 [inline] do_new_mount fs/namespace.c:2549 [inline] do_mount+0x3c9/0x24f0 fs/namespace.c:2879 SYSC_mount fs/namespace.c:3095 [inline] SyS_mount+0xa8/0x120 fs/namespace.c:3072 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45c479 RSP: 002b:00007fe226087c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fe2260886d4 RCX: 000000000045c479 RDX: 0000000020000040 RSI: 00000000200000c0 RDI: 0000000020000100 RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 000000000000074a R14: 00000000004c9d34 R15: 000000000076bf2c Allocated by task 19489: save_stack+0x32/0xa0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc mm/kasan/kasan.c:551 [inline] kasan_kmalloc+0xbf/0xe0 mm/kasan/kasan.c:529 kmem_cache_alloc_trace+0x14d/0x7b0 mm/slab.c:3618 kmalloc include/linux/slab.h:488 [inline] kzalloc include/linux/slab.h:661 [inline] ceph_parse_options+0xb8/0xe80 net/ceph/ceph_common.c:349 parse_mount_options fs/ceph/super.c:475 [inline] ceph_mount+0x39f/0x164d fs/ceph/super.c:1007 mount_fs+0x92/0x2a0 fs/super.c:1237 vfs_kern_mount.part.0+0x5b/0x3c0 fs/namespace.c:1046 vfs_kern_mount fs/namespace.c:1036 [inline] do_new_mount fs/namespace.c:2549 [inline] do_mount+0x3c9/0x24f0 fs/namespace.c:2879 SYSC_mount fs/namespace.c:3095 [inline] SyS_mount+0xa8/0x120 fs/namespace.c:3072 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 Freed by task 19489: save_stack+0x32/0xa0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xcb/0x260 mm/slab.c:3815 ceph_destroy_client+0x90/0xb0 net/ceph/ceph_common.c:671 create_fs_client fs/ceph/super.c:658 [inline] ceph_mount+0xba0/0x164d fs/ceph/super.c:1014 mount_fs+0x92/0x2a0 fs/super.c:1237 vfs_kern_mount.part.0+0x5b/0x3c0 fs/namespace.c:1046 vfs_kern_mount fs/namespace.c:1036 [inline] do_new_mount fs/namespace.c:2549 [inline] do_mount+0x3c9/0x24f0 fs/namespace.c:2879 SYSC_mount fs/namespace.c:3095 [inline] SyS_mount+0xa8/0x120 fs/namespace.c:3072 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 The buggy address belongs to the object at ffff888074a83540 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 208 bytes inside of 256-byte region [ffff888074a83540, ffff888074a83640) The buggy address belongs to the page: page:ffffea0001d2a0c0 count:1 mapcount:0 mapping:ffff888074a83040 index:0x0 flags: 0xfffe0000000100(slab) raw: 00fffe0000000100 ffff888074a83040 0000000000000000 000000010000000c raw: ffffea0001d39260 ffffea0002223d20 ffff88812fe567c0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888074a83500: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff888074a83580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888074a83600: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff888074a83680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888074a83700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== Node 1 active_anon:3459484kB inactive_anon:0kB active_file:20kB inactive_file:20kB unevictable:0kB isolated(anon):0kB isolated(file):0kB mapped:0kB dirty:0kB writeback:4kB shmem:4kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 0kB writeback_tmp:0kB unstable:0kB all_unreclaimable? yes