================================================================== BUG: KASAN: use-after-free in strp_data_ready+0x232/0x2a0 net/strparser/strparser.c:394 Read of size 1 at addr ffff8801d515e5d0 by task syz-executor3/3707 CPU: 1 PID: 3707 Comm: syz-executor3 Not tainted 4.15.0-rc8+ #205 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+0x194/0x257 lib/dump_stack.c:53 print_address_description+0x73/0x250 mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report+0x25b/0x340 mm/kasan/report.c:409 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:427 strp_data_ready+0x232/0x2a0 net/strparser/strparser.c:394 psock_data_ready+0x56/0x70 net/kcm/kcmsock.c:353 tcp_data_queue+0x1d88/0x3de0 net/ipv4/tcp_input.c:4647 tcp_rcv_established+0xab9/0x1be0 net/ipv4/tcp_input.c:5474 tcp_v6_do_rcv+0x3e2/0x11c0 net/ipv6/tcp_ipv6.c:1305 tcp_v6_rcv+0x21ed/0x2b60 net/ipv6/tcp_ipv6.c:1519 ip6_input_finish+0x37e/0x17a0 net/ipv6/ip6_input.c:284 NF_HOOK include/linux/netfilter.h:288 [inline] ip6_input+0xdb/0x560 net/ipv6/ip6_input.c:327 dst_input include/net/dst.h:449 [inline] ip6_rcv_finish+0x1a9/0x7a0 net/ipv6/ip6_input.c:71 NF_HOOK include/linux/netfilter.h:288 [inline] ipv6_rcv+0xf37/0x1fa0 net/ipv6/ip6_input.c:208 __netif_receive_skb_core+0x1a41/0x3460 net/core/dev.c:4537 __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4602 process_backlog+0x203/0x740 net/core/dev.c:5282 napi_poll net/core/dev.c:5680 [inline] net_rx_action+0x792/0x1910 net/core/dev.c:5746 __do_softirq+0x2d7/0xb85 kernel/softirq.c:285 invoke_softirq kernel/softirq.c:365 [inline] irq_exit+0x1cc/0x200 kernel/softirq.c:405 exiting_irq arch/x86/include/asm/apic.h:541 [inline] smp_apic_timer_interrupt+0x16b/0x700 arch/x86/kernel/apic/apic.c:1052 apic_timer_interrupt+0xa9/0xb0 arch/x86/entry/entry_64.S:937 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:777 [inline] RIP: 0010:lock_is_held_type+0x18b/0x210 kernel/locking/lockdep.c:3954 RSP: 0018:ffff8801afaa6f38 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff11 RAX: dffffc0000000000 RBX: 0000000000000282 RCX: ffffffff81a84943 RDX: 1ffffffff0d1918d RSI: ffffffff86941500 RDI: 0000000000000282 RBP: ffff8801afaa6f58 R08: 0000000000000000 R09: 1ffff10035f54de4 R10: ffff8801afaa6ee8 R11: 0000000000000003 R12: ffff8801afa9e340 R13: 0000000000000000 R14: 0000000000000bf1 R15: 00000000014000c0 lock_is_held include/linux/lockdep.h:344 [inline] ___might_sleep+0x3d8/0x470 kernel/sched/core.c:6025 __might_sleep+0x95/0x190 kernel/sched/core.c:6013 cache_alloc_debugcheck_before mm/slab.c:3057 [inline] slab_alloc mm/slab.c:3372 [inline] kmem_cache_alloc+0x2bf/0x760 mm/slab.c:3542 anon_vma_chain_alloc mm/rmap.c:128 [inline] anon_vma_fork+0x2e6/0x870 mm/rmap.c:343 dup_mmap kernel/fork.c:670 [inline] dup_mm kernel/fork.c:1196 [inline] copy_mm+0xb4d/0x131b kernel/fork.c:1250 copy_process.part.38+0x1ee9/0x4b20 kernel/fork.c:1752 copy_process kernel/fork.c:1565 [inline] _do_fork+0x1f7/0xfe0 kernel/fork.c:2044 SYSC_clone kernel/fork.c:2154 [inline] SyS_clone+0x37/0x50 kernel/fork.c:2148 do_syscall_64+0x273/0x920 arch/x86/entry/common.c:285 entry_SYSCALL64_slow_path+0x25/0x25 RIP: 0033:0x45160a RSP: 002b:0000000000a2f9e0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000a2f9e0 RCX: 000000000045160a RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000000000a2fa20 R08: 0000000000000001 R09: 0000000001435940 R10: 0000000001435c10 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001 Allocated by task 7363: 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:3544 kmem_cache_zalloc include/linux/slab.h:678 [inline] kcm_attach net/kcm/kcmsock.c:1394 [inline] kcm_attach_ioctl net/kcm/kcmsock.c:1460 [inline] kcm_ioctl+0x2d2/0x1690 net/kcm/kcmsock.c:1665 sock_do_ioctl+0x65/0xb0 net/socket.c:958 sock_ioctl+0x2c2/0x440 net/socket.c:1055 vfs_ioctl fs/ioctl.c:46 [inline] do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:686 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 entry_SYSCALL_64_fastpath+0x29/0xa0 Freed by task 7351: 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:3488 [inline] kmem_cache_free+0x83/0x2a0 mm/slab.c:3746 kcm_unattach+0xe53/0x1510 net/kcm/kcmsock.c:1563 release_mux net/kcm/kcmsock.c:1727 [inline] kcm_done+0x5c7/0x1990 net/kcm/kcmsock.c:1787 kcm_release+0x478/0x860 net/kcm/kcmsock.c:1861 sock_release+0x8d/0x1e0 net/socket.c:595 sock_close+0x16/0x20 net/socket.c:1123 __fput+0x327/0x7e0 fs/file_table.c:210 ____fput+0x15/0x20 fs/file_table.c:244 task_work_run+0x199/0x270 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x9bb/0x1ad0 kernel/exit.c:865 do_group_exit+0x149/0x400 kernel/exit.c:968 get_signal+0x73f/0x16c0 kernel/signal.c:2335 do_signal+0x90/0x1eb0 arch/x86/kernel/signal.c:809 exit_to_usermode_loop+0x214/0x310 arch/x86/entry/common.c:158 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath+0x490/0x550 arch/x86/entry/common.c:264 entry_SYSCALL_64_fastpath+0x9e/0xa0 The buggy address belongs to the object at ffff8801d515e5c0 which belongs to the cache kcm_psock_cache of size 544 The buggy address is located 16 bytes inside of 544-byte region [ffff8801d515e5c0, ffff8801d515e7e0) The buggy address belongs to the page: page:ffffea0007545780 count:1 mapcount:0 mapping:ffff8801d515e040 index:0xffff8801d515ee00 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffff8801d515e040 ffff8801d515ee00 0000000100000005 raw: ffffea0006f23aa0 ffffea00073d2320 ffff8801d32bc780 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d515e480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801d515e500: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc >ffff8801d515e580: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff8801d515e600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801d515e680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================