BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:276 [inline] BUG: KASAN: use-after-free in atomic64_read arch/x86/include/asm/atomic64_64.h:21 [inline] BUG: KASAN: use-after-free in atomic_long_read include/asm-generic/atomic-long.h:44 [inline] BUG: KASAN: use-after-free in get_work_pool+0x1c2/0x1e0 kernel/workqueue.c:709 Read of size 8 at addr ffff8801c34d6fb8 by task syz-executor1/18335 CPU: 1 PID: 18335 Comm: syz-executor1 Not tainted 4.13.0-next-20170912+ #20 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:52 print_address_description+0x73/0x250 mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report+0x24e/0x340 mm/kasan/report.c:409 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430 __read_once_size include/linux/compiler.h:276 [inline] atomic64_read arch/x86/include/asm/atomic64_64.h:21 [inline] atomic_long_read include/asm-generic/atomic-long.h:44 [inline] get_work_pool+0x1c2/0x1e0 kernel/workqueue.c:709 __queue_work+0x235/0x1150 kernel/workqueue.c:1401 queue_work_on+0x16a/0x1c0 kernel/workqueue.c:1486 queue_work include/linux/workqueue.h:489 [inline] strp_check_rcv+0x25/0x30 net/strparser/strparser.c:553 kcm_attach net/kcm/kcmsock.c:1439 [inline] kcm_attach_ioctl net/kcm/kcmsock.c:1460 [inline] kcm_ioctl+0x826/0x1610 net/kcm/kcmsock.c:1695 sock_do_ioctl+0x65/0xb0 net/socket.c:961 sock_ioctl+0x2c2/0x440 net/socket.c:1058 vfs_ioctl fs/ioctl.c:45 [inline] do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:685 SYSC_ioctl fs/ioctl.c:700 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691 entry_SYSCALL_64_fastpath+0x1f/0xbe RIP: 0033:0x451e59 RSP: 002b:00007fdfd06e6c08 EFLAGS: 00000216 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000007180b0 RCX: 0000000000451e59 RDX: 00000000209b9000 RSI: 00000000000089e0 RDI: 000000000000000a RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000216 R12: 00000000004b71b5 R13: 00000000ffffffff R14: 0000000000000005 R15: 0000000020b4cfd0 Allocated by task 18335: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489 kmem_cache_alloc+0x12e/0x760 mm/slab.c:3561 kmem_cache_zalloc include/linux/slab.h:656 [inline] kcm_attach net/kcm/kcmsock.c:1394 [inline] kcm_attach_ioctl net/kcm/kcmsock.c:1460 [inline] kcm_ioctl+0x2d1/0x1610 net/kcm/kcmsock.c:1695 sock_do_ioctl+0x65/0xb0 net/socket.c:961 sock_ioctl+0x2c2/0x440 net/socket.c:1058 vfs_ioctl fs/ioctl.c:45 [inline] do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:685 SYSC_ioctl fs/ioctl.c:700 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691 entry_SYSCALL_64_fastpath+0x1f/0xbe Freed by task 18339: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3503 [inline] kmem_cache_free+0x77/0x280 mm/slab.c:3763 kcm_unattach+0xe50/0x1510 net/kcm/kcmsock.c:1563 kcm_unattach_ioctl net/kcm/kcmsock.c:1608 [inline] kcm_ioctl+0xdf0/0x1610 net/kcm/kcmsock.c:1705 sock_do_ioctl+0x65/0xb0 net/socket.c:961 sock_ioctl+0x2c2/0x440 net/socket.c:1058 vfs_ioctl fs/ioctl.c:45 [inline] do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:685 SYSC_ioctl fs/ioctl.c:700 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691 entry_SYSCALL_64_fastpath+0x1f/0xbe The buggy address belongs to the object at ffff8801c34d6e80 which belongs to the cache kcm_psock_cache of size 664 The buggy address is located 312 bytes inside of 664-byte region [ffff8801c34d6e80, ffff8801c34d7118) The buggy address belongs to the page: page:ffffea00070d3580 count:1 mapcount:0 mapping:ffff8801c34d6180 index:0x0 compound_mapcount: 0 flags: 0x200000000008100(slab|head) raw: 0200000000008100 ffff8801c34d6180 0000000000000000 0000000100000009 raw: ffffea00070d81a0 ffffea00070ff0a0 ffff8801d2ff7cc0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801c34d6e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801c34d6f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8801c34d6f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801c34d7000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801c34d7080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================