================================================================== BUG: KASAN: slab-out-of-bounds in __hlist_del include/linux/list.h:704 [inline] BUG: KASAN: slab-out-of-bounds in hlist_del_init include/linux/list.h:717 [inline] BUG: KASAN: slab-out-of-bounds in __xfrm_policy_unlink+0x9c1/0xa20 net/xfrm/xfrm_policy.c:2213 Write of size 8 at addr ffff8881baf2feb0 by task syz-executor2/31152 CPU: 1 PID: 31152 Comm: syz-executor2 Not tainted 4.20.0-rc7+ #360 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+0x1d3/0x2c6 lib/dump_stack.c:113 print_address_description.cold.8+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.9+0x242/0x309 mm/kasan/report.c:412 __asan_report_store8_noabort+0x17/0x20 mm/kasan/report.c:438 __hlist_del include/linux/list.h:704 [inline] hlist_del_init include/linux/list.h:717 [inline] __xfrm_policy_unlink+0x9c1/0xa20 net/xfrm/xfrm_policy.c:2213 xfrm_policy_flush+0x344/0x480 net/xfrm/xfrm_policy.c:1789 pfkey_spdflush+0x9f/0x3a0 net/key/af_key.c:2785 pfkey_process+0x851/0x9a0 net/key/af_key.c:2844 pfkey_sendmsg+0x5df/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+0x51d/0x930 net/socket.c:2116 __sys_sendmmsg+0x246/0x6d0 net/socket.c:2211 __do_sys_sendmmsg net/socket.c:2240 [inline] __se_sys_sendmmsg net/socket.c:2237 [inline] __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2237 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457759 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:00007fdbcf199c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000457759 RDX: 0400000000000117 RSI: 0000000020000180 RDI: 0000000000000004 RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fdbcf19a6d4 R13: 00000000004c436a R14: 00000000004d78a8 R15: 00000000ffffffff Allocated by task 30758: 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 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490 kmem_cache_alloc+0x12e/0x730 mm/slab.c:3554 getname_flags+0xd0/0x590 fs/namei.c:140 user_path_at_empty+0x2d/0x50 fs/namei.c:2608 user_path_at include/linux/namei.h:57 [inline] do_faccessat+0x254/0x800 fs/open.c:378 __do_sys_access fs/open.c:430 [inline] __se_sys_access fs/open.c:428 [inline] __x64_sys_access+0x59/0x80 fs/open.c:428 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 30758: 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] kmem_cache_free+0x83/0x290 mm/slab.c:3760 putname+0xf2/0x130 fs/namei.c:261 filename_lookup+0x39a/0x520 fs/namei.c:2357 user_path_at_empty+0x40/0x50 fs/namei.c:2608 user_path_at include/linux/namei.h:57 [inline] do_faccessat+0x254/0x800 fs/open.c:378 __do_sys_access fs/open.c:430 [inline] __se_sys_access fs/open.c:428 [inline] __x64_sys_access+0x59/0x80 fs/open.c:428 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8881baf2e9c0 which belongs to the cache names_cache of size 4096 The buggy address is located 1264 bytes to the right of 4096-byte region [ffff8881baf2e9c0, ffff8881baf2f9c0) The buggy address belongs to the page: page:ffffea0006ebcb80 count:1 mapcount:0 mapping:ffff8881da98be00 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000010200(slab|head) raw: 02fffc0000010200 ffffea00054ab888 ffffea000656cf88 ffff8881da98be00 raw: 0000000000000000 ffff8881baf2e9c0 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881baf2fd80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881baf2fe00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8881baf2fe80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8881baf2ff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881baf2ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================