================================================================== BUG: KASAN: use-after-free in xfrm_policy_insert_list+0xd7f/0x1020 net/xfrm/xfrm_policy.c:1532 Read of size 1 at addr ffff8881c3859899 by task syz-executor4/3341 CPU: 1 PID: 3341 Comm: syz-executor4 Not tainted 4.20.0-rc6+ #352 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x244/0x39d lib/dump_stack.c:113 print_address_description.cold.7+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.8+0x242/0x309 mm/kasan/report.c:412 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:430 xfrm_policy_insert_list+0xd7f/0x1020 net/xfrm/xfrm_policy.c:1532 xfrm_policy_inexact_insert+0x166/0xee0 net/xfrm/xfrm_policy.c:1195 xfrm_policy_insert+0x639/0x850 net/xfrm/xfrm_policy.c:1570 pfkey_spdadd+0x10f8/0x19d0 net/key/af_key.c:2339 pfkey_process+0x857/0x9a0 net/key/af_key.c:2844 pfkey_sendmsg+0x5e5/0xfb0 net/key/af_key.c:3683 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:631 ___sys_sendmsg+0x7fd/0x930 net/socket.c:2116 __sys_sendmsg+0x11d/0x280 net/socket.c:2154 __do_sys_sendmsg net/socket.c:2163 [inline] __se_sys_sendmsg net/socket.c:2161 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2161 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457669 Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fd614ac3c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457669 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000003 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd614ac46d4 R13: 00000000004c443a R14: 00000000004d7410 R15: 00000000ffffffff Allocated by task 2547: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 __do_kmalloc mm/slab.c:3722 [inline] __kmalloc+0x15b/0x760 mm/slab.c:3731 kmalloc_array include/linux/slab.h:669 [inline] kcalloc include/linux/slab.h:680 [inline] alloc_pipe_info+0x2ce/0x5d0 fs/pipe.c:650 get_pipe_inode fs/pipe.c:712 [inline] create_pipe_files+0x91/0x720 fs/pipe.c:744 __do_pipe_flags+0x45/0x250 fs/pipe.c:781 do_pipe2+0x9d/0x310 fs/pipe.c:829 __do_sys_pipe2 fs/pipe.c:847 [inline] __se_sys_pipe2 fs/pipe.c:845 [inline] __x64_sys_pipe2+0x54/0x80 fs/pipe.c:845 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 2547: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xcf/0x230 mm/slab.c:3817 free_pipe_info+0x24b/0x300 fs/pipe.c:683 put_pipe_info+0xd0/0xf0 fs/pipe.c:556 pipe_release+0x1de/0x270 fs/pipe.c:577 __fput+0x385/0xa30 fs/file_table.c:278 ____fput+0x15/0x20 fs/file_table.c:309 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8881c3859680 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 537 bytes inside of 1024-byte region [ffff8881c3859680, ffff8881c3859a80) The buggy address belongs to the page: page:ffffea00070e1600 count:1 mapcount:0 mapping:ffff8881da800ac0 index:0xffff8881c3858000 compound_mapcount: 0 flags: 0x2fffc0000010200(slab|head) raw: 02fffc0000010200 ffffea000654db08 ffffea0007056888 ffff8881da800ac0 raw: ffff8881c3858000 ffff8881c3858000 0000000100000004 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881c3859780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881c3859800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881c3859880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881c3859900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881c3859980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================