1965979 pages RAM
0 pages HighMem/MovableOnly
339053 pages reserved
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 ffff88809b113b50 by task syz-executor.3/32719

CPU: 0 PID: 32719 Comm: syz-executor.3 Not tainted 4.14.180-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+0xd4c/0x1815 fs/ceph/super.c:1036
 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: 0033:0x45ca29
RSP: 002b:00007fb9c190ec78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00000000004f6280 RCX: 000000000045ca29
RDX: 0000000020000040 RSI: 00000000200000c0 RDI: 0000000020000480
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000751 R14: 00000000004ca3aa R15: 00007fb9c190f6d4

Allocated by task 32719:
 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:501 [inline]
 ceph_mount+0x44f/0x1815 fs/ceph/super.c:1025
 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 32719:
 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:684 [inline]
 ceph_mount+0xd25/0x1815 fs/ceph/super.c:1032
 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 ffff88809b113a80
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 208 bytes inside of
 256-byte region [ffff88809b113a80, ffff88809b113b80)
The buggy address belongs to the page:
page:ffffea00026c44c0 count:1 mapcount:0 mapping:ffff88809b113080 index:0xffff88809b113940
flags: 0xfffe0000000100(slab)
raw: 00fffe0000000100 ffff88809b113080 ffff88809b113940 0000000100000005
raw: ffffea00027df560 ffffea00023714e0 ffff88812fe547c0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809b113a00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff88809b113a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88809b113b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                 ^
 ffff88809b113b80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
 ffff88809b113c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================