Node 1 active_anon:3405892kB inactive_anon:28kB active_file:6752kB inactive_file:5904kB unevictable:0kB isolated(anon):0kB isolated(file):128kB mapped:10096kB dirty:240kB writeback:0kB shmem:40kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 18432kB writeback_tmp:0kB unstable:0kB all_unreclaimable? no Node 0 DMA free:10428kB min:216kB low:268kB high:320kB active_anon:4484kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15992kB managed:15908kB mlocked:0kB kernel_stack:64kB pagetables:52kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB ================================================================== BUG: KASAN: use-after-free in ceph_destroy_options+0xe9/0x110 net/ceph/ceph_common.c:283 Read of size 8 at addr ffff88803a1808d0 by task syz-executor.4/20787 CPU: 0 PID: 20787 Comm: syz-executor.4 Not tainted 4.14.158-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 lowmem_reserve[]: Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x142/0x197 lib/dump_stack.c:58 print_address_description.cold+0x7c/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+0xa9/0x2af mm/kasan/report.c:393 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430 ceph_destroy_options+0xe9/0x110 net/ceph/ceph_common.c:283 ceph_mount+0xb6b/0x1660 fs/ceph/super.c:1018 mount_fs+0x97/0x2a1 fs/super.c:1237 vfs_kern_mount.part.0+0x5e/0x3d0 fs/namespace.c:1046 vfs_kern_mount fs/namespace.c:1036 [inline] do_new_mount fs/namespace.c:2549 [inline] do_mount+0x417/0x27d0 fs/namespace.c:2879 0 SYSC_mount fs/namespace.c:3095 [inline] SyS_mount+0xab/0x120 fs/namespace.c:3072 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45a909 2569 RSP: 002b:00007f40fae41c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045a909 RDX: 0000000020000140 RSI: 00000000200000c0 RDI: 0000000020000040 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f40fae426d4 R13: 00000000004c7d4d R14: 00000000004deb28 R15: 00000000ffffffff Allocated by task 20787: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x45/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc mm/kasan/kasan.c:551 [inline] kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:529 kmem_cache_alloc_trace+0x152/0x790 mm/slab.c:3618 2569 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 2569 parse_mount_options fs/ceph/super.c:475 [inline] ceph_mount+0x3c1/0x1660 fs/ceph/super.c:1007 2569 mount_fs+0x97/0x2a1 fs/super.c:1237 Node 0 vfs_kern_mount.part.0+0x5e/0x3d0 fs/namespace.c:1046 vfs_kern_mount fs/namespace.c:1036 [inline] do_new_mount fs/namespace.c:2549 [inline] do_mount+0x417/0x27d0 fs/namespace.c:2879 SYSC_mount fs/namespace.c:3095 [inline] SyS_mount+0xab/0x120 fs/namespace.c:3072 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 Freed by task 20787: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x45/0xd0 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+0xcc/0x270 mm/slab.c:3815 ceph_destroy_options+0xdc/0x110 net/ceph/ceph_common.c:289 ceph_destroy_client+0x9d/0xc0 net/ceph/ceph_common.c:671 create_fs_client fs/ceph/super.c:658 [inline] ceph_mount+0xb44/0x1660 fs/ceph/super.c:1014 DMA32 free:28140kB min:36380kB low:45472kB high:54564kB active_anon:1935288kB inactive_anon:724kB active_file:28kB inactive_file:3584kB unevictable:0kB writepending:16kB present:3129332kB managed:2634384kB mlocked:0kB kernel_stack:15616kB pagetables:41964kB bounce:0kB free_pcp:1008kB local_pcp:692kB free_cma:0kB mount_fs+0x97/0x2a1 fs/super.c:1237 vfs_kern_mount.part.0+0x5e/0x3d0 fs/namespace.c:1046 vfs_kern_mount fs/namespace.c:1036 [inline] do_new_mount fs/namespace.c:2549 [inline] do_mount+0x417/0x27d0 fs/namespace.c:2879 SYSC_mount fs/namespace.c:3095 [inline] SyS_mount+0xab/0x120 fs/namespace.c:3072 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 The buggy address belongs to the object at ffff88803a180800 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 208 bytes inside of 256-byte region [ffff88803a180800, ffff88803a180900) The buggy address belongs to the page: page:ffffea0000e86000 count:1 mapcount:0 mapping:ffff88803a180080 index:0x0 flags: 0xfffe0000000100(slab) raw: 00fffe0000000100 ffff88803a180080 0000000000000000 000000010000000c raw: ffffea0000e8a860 ffffea0000e87520 ffff8880aa8007c0 0000000000000000 lowmem_reserve[]: page dumped because: kasan: bad access detected 0 0 0 Memory state around the buggy address: ffff88803a180780: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88803a180800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88803a180880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88803a180900: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff88803a180980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================