1965979 pages RAM 0 pages HighMem/MovableOnly 335855 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 ffff8880a5543ed0 by task syz-executor.4/22707 CPU: 0 PID: 22707 Comm: syz-executor.4 Not tainted 4.14.169-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+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 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: 0033:0x45b399 RSP: 002b:00007f6122514c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f61225156d4 RCX: 000000000045b399 RDX: 0000000020000140 RSI: 00000000200000c0 RDI: 0000000020000040 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000745 R14: 00000000004c8c38 R15: 000000000075bf2c Allocated by task 22707: 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:475 [inline] ceph_mount+0x3c1/0x1660 fs/ceph/super.c:1007 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 22707: 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 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 ffff8880a5543e00 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 208 bytes inside of 256-byte region [ffff8880a5543e00, ffff8880a5543f00) The buggy address belongs to the page: page:ffffea00029550c0 count:1 mapcount:0 mapping:ffff8880a5543040 index:0xffff8880a5543040 flags: 0xfffe0000000100(slab) raw: 00fffe0000000100 ffff8880a5543040 ffff8880a5543040 0000000100000008 raw: ffffea00011c9fe0 ffffea00025821e0 ffff8880aa8007c0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a5543d80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8880a5543e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880a5543e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a5543f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a5543f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== ================================================================== BUG: KASAN: double-free or invalid-free in ceph_destroy_options+0xd4/0x110 net/ceph/ceph_common.c:288 CPU: 0 PID: 22715 Comm: syz-executor.1 Tainted: G B 4.14.169-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+0x142/0x197 lib/dump_stack.c:58 print_address_description.cold+0x7c/0x1dc mm/kasan/report.c:252 kasan_report_double_free+0x56/0x80 mm/kasan/report.c:333 kasan_slab_free+0xa7/0xc0 mm/kasan/kasan.c:514 __cache_free mm/slab.c:3496 [inline] kfree+0xcc/0x270 mm/slab.c:3815 ceph_destroy_options+0xd4/0x110 net/ceph/ceph_common.c:288 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 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: 0033:0x45b399 RSP: 002b:00007f7990e41c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f7990e426d4 RCX: 000000000045b399 RDX: 0000000020000140 RSI: 00000000200000c0 RDI: 0000000020000040 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000745 R14: 00000000004c8c38 R15: 000000000075bf2c Allocated by task 22715: 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] kmalloc_array include/linux/slab.h:606 [inline] kcalloc include/linux/slab.h:618 [inline] ceph_parse_options+0xfe/0xe80 net/ceph/ceph_common.c:352 parse_mount_options fs/ceph/super.c:475 [inline] ceph_mount+0x3c1/0x1660 fs/ceph/super.c:1007 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 22715: 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+0xd4/0x110 net/ceph/ceph_common.c:288 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 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 ffff88814ebd9240 which belongs to the cache kmalloc-8192 of size 8192 The buggy address is located 0 bytes inside of 8192-byte region [ffff88814ebd9240, ffff88814ebdb240) The buggy address belongs to the page: page:ffffea00053af600 count:1 mapcount:0 mapping:ffff88814ebd9240 index:0x0 compound_mapcount: 0 flags: 0x57ffe0000008100(slab|head) raw: 057ffe0000008100 ffff88814ebd9240 0000000000000000 0000000100000001 raw: ffffea0004cc5920 ffffea00053ae720 ffff8880aa802080 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88814ebd9100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88814ebd9180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88814ebd9200: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff88814ebd9280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88814ebd9300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================