1965979 pages RAM 0 pages HighMem/MovableOnly 333227 pages reserved 0 pages cma reserved ================================================================== BUG: KASAN: use-after-free in ceph_destroy_options+0xe9/0x110 net/ceph/ceph_common.c:283 Read of size 8 at addr ffff8880a8de9c90 by task syz-executor.4/27500 CPU: 0 PID: 27500 Comm: syz-executor.4 Not tainted 4.14.137 #33 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+0x138/0x19c lib/dump_stack.c:53 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+0xb6d/0x1709 fs/ceph/super.c:1009 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 RIP: 0033:0x459829 RSP: 002b:00007f8246567c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000459829 RDX: 0000000020000140 RSI: 00000000200000c0 RDI: 0000000020000040 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f82465686d4 R13: 00000000004c5e57 R14: 00000000004da7d8 R15: 00000000ffffffff Allocated by task 27500: 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 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:466 [inline] ceph_mount+0x3c1/0x1709 fs/ceph/super.c:998 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 Freed by task 27500: 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:649 [inline] ceph_mount+0xb46/0x1709 fs/ceph/super.c:1005 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 ffff8880a8de9bc0 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 208 bytes inside of 256-byte region [ffff8880a8de9bc0, ffff8880a8de9cc0) The buggy address belongs to the page: page:ffffea0002a37a40 count:1 mapcount:0 mapping:ffff8880a8de9080 index:0xffff8880a8de9440 flags: 0x1fffc0000000100(slab) raw: 01fffc0000000100 ffff8880a8de9080 ffff8880a8de9440 0000000100000005 raw: ffffea0002a3e8a0 ffffea0002a3cb20 ffff8880aa8007c0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a8de9b80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff8880a8de9c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880a8de9c80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff8880a8de9d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a8de9d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================