================================================================== BUG: KASAN: use-after-free in xfrm_migrate_policy_find net/xfrm/xfrm_policy.c:4055 [inline] BUG: KASAN: use-after-free in xfrm_migrate+0x178f/0x1a30 net/xfrm/xfrm_policy.c:4193 Read of size 4 at addr ffff8880a785a9b4 by task syz-executor2/7110 CPU: 0 PID: 7110 Comm: syz-executor2 Not tainted 5.0.0-rc2+ #12 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+0x1db/0x2d0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 __asan_report_load4_noabort+0x14/0x20 mm/kasan/generic_report.c:134 xfrm_migrate_policy_find net/xfrm/xfrm_policy.c:4055 [inline] xfrm_migrate+0x178f/0x1a30 net/xfrm/xfrm_policy.c:4193 xfrm_do_migrate+0x9e5/0xd90 net/xfrm/xfrm_user.c:2380 xfrm_user_rcv_msg+0x458/0x8d0 net/xfrm/xfrm_user.c:2663 netlink_rcv_skb+0x17d/0x410 net/netlink/af_netlink.c:2477 xfrm_netlink_rcv+0x70/0x90 net/xfrm/xfrm_user.c:2671 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline] netlink_unicast+0x574/0x770 net/netlink/af_netlink.c:1336 netlink_sendmsg+0xa05/0xf90 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:631 ___sys_sendmsg+0x7ec/0x910 net/socket.c:2116 __sys_sendmsg+0x112/0x270 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+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458099 Code: 6d b7 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 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fcd4a70fc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458099 RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000000000003 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fcd4a7106d4 R13: 00000000004c562b R14: 00000000004d9298 R15: 00000000ffffffff Allocated by task 6446: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_kmalloc mm/kasan/common.c:496 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:469 kasan_kmalloc mm/kasan/common.c:504 [inline] kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:411 kmem_cache_alloc+0x12d/0x710 mm/slab.c:3543 getname_flags fs/namei.c:140 [inline] getname_flags+0xd6/0x5b0 fs/namei.c:129 getname+0x1a/0x20 fs/namei.c:211 do_sys_open+0x3a5/0x7c0 fs/open.c:1057 __do_sys_openat fs/open.c:1090 [inline] __se_sys_openat fs/open.c:1084 [inline] __x64_sys_openat+0x9d/0x100 fs/open.c:1084 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 6446: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:458 kasan_slab_free+0xe/0x10 mm/kasan/common.c:466 __cache_free mm/slab.c:3487 [inline] kmem_cache_free+0x86/0x260 mm/slab.c:3749 putname+0xef/0x130 fs/namei.c:261 do_sys_open+0x3f4/0x7c0 fs/open.c:1072 __do_sys_openat fs/open.c:1090 [inline] __se_sys_openat fs/open.c:1084 [inline] __x64_sys_openat+0x9d/0x100 fs/open.c:1084 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880a785a300 which belongs to the cache names_cache of size 4096 The buggy address is located 1716 bytes inside of 4096-byte region [ffff8880a785a300, ffff8880a785b300) The buggy address belongs to the page: page:ffffea00029e1680 count:1 mapcount:0 mapping:ffff8880aa16adc0 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea00023ab808 ffffea0002917a08 ffff8880aa16adc0 raw: 0000000000000000 ffff8880a785a300 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a785a880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a785a900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880a785a980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a785aa00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a785aa80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================