================================================================== BUG: KASAN: slab-out-of-bounds in memset include/linux/string.h:384 [inline] BUG: KASAN: slab-out-of-bounds in xfrm_attr_cpy32+0x15a/0x1d0 net/xfrm/xfrm_compat.c:393 Write of size 4 at addr ffff888041d354f8 by task syz-executor.3/9917 CPU: 2 PID: 9917 Comm: syz-executor.3 Not tainted 5.10.0-rc7-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xae/0x4c8 mm/kasan/report.c:385 __kasan_report mm/kasan/report.c:545 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:562 check_memory_region_inline mm/kasan/generic.c:186 [inline] check_memory_region+0x13d/0x180 mm/kasan/generic.c:192 memset+0x20/0x40 mm/kasan/common.c:84 memset include/linux/string.h:384 [inline] xfrm_attr_cpy32+0x15a/0x1d0 net/xfrm/xfrm_compat.c:393 xfrm_xlate32_attr net/xfrm/xfrm_compat.c:426 [inline] xfrm_xlate32 net/xfrm/xfrm_compat.c:525 [inline] xfrm_user_rcv_msg_compat+0x76b/0x1040 net/xfrm/xfrm_compat.c:570 xfrm_user_rcv_msg+0x55b/0x8b0 net/xfrm/xfrm_user.c:2714 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494 xfrm_netlink_rcv+0x6b/0x90 net/xfrm/xfrm_user.c:2764 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:671 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2353 ___sys_sendmsg+0xf3/0x170 net/socket.c:2407 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2440 do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline] __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:137 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f32549 Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000f552c0bc EFLAGS: 00000296 ORIG_RAX: 0000000000000172 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000200000c0 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 9917: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:461 kmalloc_node include/linux/slab.h:575 [inline] kvmalloc_node+0x61/0xf0 mm/util.c:575 kvmalloc include/linux/mm.h:765 [inline] xfrm_user_rcv_msg_compat+0x3cd/0x1040 net/xfrm/xfrm_compat.c:566 xfrm_user_rcv_msg+0x55b/0x8b0 net/xfrm/xfrm_user.c:2714 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494 xfrm_netlink_rcv+0x6b/0x90 net/xfrm/xfrm_user.c:2764 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:671 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2353 ___sys_sendmsg+0xf3/0x170 net/socket.c:2407 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2440 do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline] __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:137 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c Last call_rcu(): kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_record_aux_stack+0xc0/0xf0 mm/kasan/generic.c:346 __call_rcu kernel/rcu/tree.c:2953 [inline] call_rcu+0xbb/0x700 kernel/rcu/tree.c:3027 fib6_info_release include/net/ip6_fib.h:336 [inline] fib6_info_release include/net/ip6_fib.h:333 [inline] ip6_route_info_create+0xf79/0x19d0 net/ipv6/route.c:3731 ip6_route_add+0x24/0x150 net/ipv6/route.c:3741 addrconf_prefix_route+0x354/0x4e0 net/ipv6/addrconf.c:2412 inet6_addr_add+0x642/0x9d0 net/ipv6/addrconf.c:2944 inet6_rtm_newaddr+0xf0b/0x1860 net/ipv6/addrconf.c:4865 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5562 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:671 __sys_sendto+0x21c/0x320 net/socket.c:1992 __do_compat_sys_socketcall+0x47f/0x660 net/compat.c:476 do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline] __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:137 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c The buggy address belongs to the object at ffff888041d35400 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 248 bytes inside of 256-byte region [ffff888041d35400, ffff888041d35500) The buggy address belongs to the page: page:0000000043698f3d refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x41d34 head:0000000043698f3d order:2 compound_mapcount:0 compound_pincount:0 flags: 0x4fff00000010200(slab|head) raw: 04fff00000010200 dead000000000100 dead000000000122 ffff888010043400 raw: 0000000000000000 0000000080200020 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888041d35380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888041d35400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888041d35480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc ^ ffff888041d35500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888041d35580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================