Node 0 Normal free:0kB min:4kB low:4kB high:4kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:786432kB managed:344kB mlocked:0kB kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB lowmem_reserve[]: 0 0 0 0 0 ================================================================== BUG: KASAN: use-after-free in ceph_destroy_options+0xda/0x100 net/ceph/ceph_common.c:283 Read of size 8 at addr ffff88808f084dd0 by task syz-executor.3/16039 CPU: 1 PID: 16039 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: 0033:0x45c829 RSP: 002b:00007f5917d32c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000004f6020 RCX: 000000000045c829 RDX: 0000000020000040 RSI: 00000000200000c0 RDI: 0000000020000480 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000751 R14: 00000000004ca1aa R15: 00007f5917d336d4 Allocated by task 16039: 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 16039: 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 Node 1 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 ffff88808f084d00 which belongs to the cache kmalloc-256 of size 256 Normal free:59468kB min:53612kB low:67012kB high:80412kB active_anon:3342956kB inactive_anon:9440kB active_file:3932kB inactive_file:1324kB unevictable:0kB writepending:256kB present:3932160kB managed:3870192kB mlocked:0kB kernel_stack:32864kB pagetables:90020kB bounce:0kB free_pcp:964kB local_pcp:684kB free_cma:0kB The buggy address is located 208 bytes inside of 256-byte region [ffff88808f084d00, ffff88808f084e00) The buggy address belongs to the page: page:ffffea00023c2100 count:1 mapcount:0 mapping:ffff88808f084080 index:0x0 flags: 0xfffe0000000100(slab) raw: 00fffe0000000100 ffff88808f084080 0000000000000000 000000010000000c raw: ffffea0002531ba0 ffffea00010f20a0 ffff88812fe547c0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808f084c80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88808f084d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88808f084d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88808f084e00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff88808f084e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== lowmem_reserve[]: 0 0 0 0 0 Node 0 DMA: 44*4kB (UMEH) 53*8kB (UMEH) 32*16kB (UEH) 19*32kB (UEH) 3*64kB (H) 1*128kB (M) 3*256kB (M) 5*512kB (UME) 1*1024kB (E) 2*2048kB (UE) 0*4096kB = 10488kB Node 0 DMA32: 1014*4kB (UME) 967*8kB (UME) 1063*16kB (UME) 363*32kB (UE) 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 40416kB Node 0 Normal: 0*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 0kB Node 1 Normal: 1654*4kB (UME) 831*8kB (UME) 207*16kB (ME) 802*32kB (UME) 262*64kB (UME) 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 59008kB Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=1048576kB Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB Node 1 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=1048576kB Node 1 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB 10959 total pagecache pages 0 pages in swap cache Swap cache stats: add 0, delete 0, find 0/0 Free swap = 0kB Total swap = 0kB 1965979 pages RAM 0 pages HighMem/MovableOnly 339053 pages reserved 0 pages cma reserved