loop0: partition table beyond EOD, truncated loop_reread_partitions: partition scan of loop0 (mñs=zŠ$/Ø™àc?_ΨûZUØ»¤Ù Ç¡$ج9­Ñ=É:€ò/ùý5¨Dóèµ­äå“Q7¯oâQ4C]) failed (rc=-5) x86/PAT: syz-executor7:14369 map pfn RAM range req write-combining for [mem 0x1b01d0000-0x1b01d3fff], got write-back protocol 0800 is buggy, dev ip6_vti0 ================================================================== BUG: KASAN: use-after-free in _decode_session4+0x15f0/0x1990 net/ipv4/xfrm4_policy.c:115 Read of size 1 at addr ffff8801d82f8b18 by task syz-executor5/14375 CPU: 0 PID: 14375 Comm: syz-executor5 Not tainted 4.16.0-rc7+ #5 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+0x194/0x24d lib/dump_stack.c:53 print_address_description+0x73/0x250 mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report+0x23c/0x360 mm/kasan/report.c:412 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:430 _decode_session4+0x15f0/0x1990 net/ipv4/xfrm4_policy.c:115 __xfrm_decode_session+0x68/0x110 net/xfrm/xfrm_policy.c:2368 xfrm_decode_session include/net/xfrm.h:1206 [inline] vti6_tnl_xmit+0x36d/0x1820 net/ipv6/ip6_vti.c:546 __netdev_start_xmit include/linux/netdevice.h:4066 [inline] netdev_start_xmit include/linux/netdevice.h:4075 [inline] xmit_one net/core/dev.c:3026 [inline] dev_hard_start_xmit+0x24e/0xac0 net/core/dev.c:3042 __dev_queue_xmit+0x26bf/0x2fc0 net/core/dev.c:3557 dev_queue_xmit+0x17/0x20 net/core/dev.c:3590 packet_snd net/packet/af_packet.c:2944 [inline] packet_sendmsg+0x3aed/0x60b0 net/packet/af_packet.c:2969 sock_sendmsg_nosec net/socket.c:630 [inline] sock_sendmsg+0xca/0x110 net/socket.c:640 SYSC_sendto+0x361/0x5c0 net/socket.c:1747 SyS_sendto+0x40/0x50 net/socket.c:1715 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x4548b9 RSP: 002b:00007f0fd38a8c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f0fd38a96d4 RCX: 00000000004548b9 RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000014 RBP: 000000000072bf58 R08: 0000000020000000 R09: 000000000000001c R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000004f3 R14: 00000000006f9768 R15: 0000000000000001 Allocated by task 14375: 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:552 __do_kmalloc_node mm/slab.c:3670 [inline] __kmalloc_node_track_caller+0x47/0x70 mm/slab.c:3684 __kmalloc_reserve.isra.39+0x41/0xd0 net/core/skbuff.c:137 __alloc_skb+0x13b/0x780 net/core/skbuff.c:205 alloc_skb include/linux/skbuff.h:983 [inline] alloc_skb_with_frags+0x10d/0x750 net/core/skbuff.c:5227 sock_alloc_send_pskb+0x787/0x9b0 net/core/sock.c:2085 packet_alloc_skb net/packet/af_packet.c:2803 [inline] packet_snd net/packet/af_packet.c:2894 [inline] packet_sendmsg+0x1ece/0x60b0 net/packet/af_packet.c:2969 sock_sendmsg_nosec net/socket.c:630 [inline] sock_sendmsg+0xca/0x110 net/socket.c:640 SYSC_sendto+0x361/0x5c0 net/socket.c:1747 SyS_sendto+0x40/0x50 net/socket.c:1715 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 Freed by task 14375: save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:520 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:527 __cache_free mm/slab.c:3486 [inline] kfree+0xd9/0x260 mm/slab.c:3801 skb_free_head+0x74/0xb0 net/core/skbuff.c:550 skb_release_data+0x58c/0x790 net/core/skbuff.c:570 skb_release_all+0x4a/0x60 net/core/skbuff.c:627 __kfree_skb net/core/skbuff.c:641 [inline] consume_skb+0x153/0x490 net/core/skbuff.c:701 packet_rcv+0x15b/0x16c0 net/packet/af_packet.c:2162 dev_queue_xmit_nit+0x866/0xc40 net/core/dev.c:1991 xmit_one net/core/dev.c:3022 [inline] dev_hard_start_xmit+0x16b/0xac0 net/core/dev.c:3042 __dev_queue_xmit+0x26bf/0x2fc0 net/core/dev.c:3557 dev_queue_xmit+0x17/0x20 net/core/dev.c:3590 packet_snd net/packet/af_packet.c:2944 [inline] packet_sendmsg+0x3aed/0x60b0 net/packet/af_packet.c:2969 sock_sendmsg_nosec net/socket.c:630 [inline] sock_sendmsg+0xca/0x110 net/socket.c:640 SYSC_sendto+0x361/0x5c0 net/socket.c:1747 SyS_sendto+0x40/0x50 net/socket.c:1715 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 The buggy address belongs to the object at ffff8801d82f8a00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 280 bytes inside of 512-byte region [ffff8801d82f8a00, ffff8801d82f8c00) The buggy address belongs to the page: page:ffffea000760be00 count:1 mapcount:0 mapping:ffff8801d82f8000 index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffff8801d82f8000 0000000000000000 0000000100000006 raw: ffffea0006cdefe0 ffffea0007243f60 ffff8801dac00940 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d82f8a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801d82f8a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8801d82f8b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801d82f8b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801d82f8c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================