1965979 pages RAM
0 pages HighMem/MovableOnly
338455 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 ffff8880971bff50 by task syz-executor.5/21906

CPU: 0 PID: 21906 Comm: syz-executor.5 Not tainted 4.14.181-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+0x1b2/0x283 lib/dump_stack.c:58
 print_address_description.cold+0x54/0x1dc 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+0xa9/0x2b9 mm/kasan/report.c:393
 ceph_destroy_options+0xda/0x100 net/ceph/ceph_common.c:283
 ceph_mount+0xd43/0x181c 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+0x3c9/0x25e0 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+0x46/0xbb
RIP: 0033:0x45ca29
RSP: 002b:00007ff622dc1c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00000000004f6280 RCX: 000000000045ca29
RDX: 0000000020000040 RSI: 00000000200000c0 RDI: 0000000020000640
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000751 R14: 00000000004ca3aa R15: 00007ff622dc26d4

Allocated by task 21906:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc.part.0+0x4f/0xd0 mm/kasan/kasan.c:551
 kmem_cache_alloc_trace+0x14d/0x3f0 mm/slab.c:3618
 kmalloc include/linux/slab.h:488 [inline]
 kzalloc include/linux/slab.h:661 [inline]
 ceph_parse_options+0xb8/0xe50 net/ceph/ceph_common.c:349
 parse_mount_options fs/ceph/super.c:501 [inline]
 ceph_mount+0x44f/0x181c 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+0x3c9/0x25e0 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+0x46/0xbb

Freed by task 21906:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0xaf/0x190 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+0xd1c/0x181c 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+0x3c9/0x25e0 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+0x46/0xbb

The buggy address belongs to the object at ffff8880971bfe80
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 208 bytes inside of
 256-byte region [ffff8880971bfe80, ffff8880971bff80)
The buggy address belongs to the page:
page:ffffea00025c6fc0 count:1 mapcount:0 mapping:ffff8880971bf0c0 index:0x0
flags: 0xfffe0000000100(slab)
raw: 00fffe0000000100 ffff8880971bf0c0 0000000000000000 000000010000000c
raw: ffffea0002a3b520 ffffea0002a274a0 ffff8880aa8007c0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880971bfe00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff8880971bfe80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880971bff00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                 ^
 ffff8880971bff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880971c0000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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