================================================================== BUG: KASAN: slab-out-of-bounds in pfkey_msg2xfrm_state net/key/af_key.c:1227 [inline] BUG: KASAN: slab-out-of-bounds in pfkey_add+0x1481/0x3230 net/key/af_key.c:1506 Read of size 7552 at addr ffff8801cce06cc0 by task syz-executor2/7981 CPU: 1 PID: 7981 Comm: syz-executor2 Not tainted 4.9.108-gb7d377b #50 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801b7ee76e0 ffffffff81eb3e29 ffffea0007338180 ffff8801cce06cc0 0000000000000000 ffff8801cce06e80 ffff8801cce06c80 ffff8801b7ee7718 ffffffff81567a89 ffff8801cce06cc0 0000000000001d80 0000000000000000 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] print_address_description+0x6c/0x234 mm/kasan/report.c:256 [] kasan_report_error mm/kasan/report.c:355 [inline] [] kasan_report.cold.6+0x242/0x2fe mm/kasan/report.c:412 [] check_memory_region_inline mm/kasan/kasan.c:318 [inline] [] check_memory_region+0x14f/0x1b0 mm/kasan/kasan.c:325 [] memcpy+0x23/0x50 mm/kasan/kasan.c:360 [] pfkey_msg2xfrm_state net/key/af_key.c:1227 [inline] [] pfkey_add+0x1481/0x3230 net/key/af_key.c:1506 [] pfkey_process+0x671/0x740 net/key/af_key.c:2834 [] pfkey_sendmsg+0x346/0xae0 net/key/af_key.c:3678 [] sock_sendmsg_nosec net/socket.c:635 [inline] [] sock_sendmsg+0xcc/0x110 net/socket.c:645 [] ___sys_sendmsg+0x6fc/0x840 net/socket.c:1969 [] __sys_sendmsg+0xd9/0x190 net/socket.c:2003 [] SYSC_sendmsg net/socket.c:2014 [inline] [] SyS_sendmsg+0x2d/0x50 net/socket.c:2010 [] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282 [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Allocated by task 7981: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack+0x43/0xd0 mm/kasan/kasan.c:505 set_track mm/kasan/kasan.c:517 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:609 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:547 slab_post_alloc_hook mm/slab.h:417 [inline] slab_alloc_node mm/slub.c:2715 [inline] slab_alloc mm/slub.c:2723 [inline] __kmalloc_track_caller+0xdc/0x2b0 mm/slub.c:4232 __kmalloc_reserve.isra.37+0x33/0xc0 net/core/skbuff.c:138 __alloc_skb+0x11a/0x600 net/core/skbuff.c:231 alloc_skb include/linux/skbuff.h:919 [inline] pfkey_sendmsg+0xfe/0xae0 net/key/af_key.c:3665 sock_sendmsg_nosec net/socket.c:635 [inline] sock_sendmsg+0xcc/0x110 net/socket.c:645 ___sys_sendmsg+0x6fc/0x840 net/socket.c:1969 __sys_sendmsg+0xd9/0x190 net/socket.c:2003 SYSC_sendmsg net/socket.c:2014 [inline] SyS_sendmsg+0x2d/0x50 net/socket.c:2010 do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282 entry_SYSCALL_64_after_swapgs+0x5d/0xdb Freed by task 6337: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack+0x43/0xd0 mm/kasan/kasan.c:505 set_track mm/kasan/kasan.c:517 [inline] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:582 slab_free_hook mm/slub.c:1355 [inline] slab_free_freelist_hook mm/slub.c:1377 [inline] slab_free mm/slub.c:2958 [inline] kfree+0xfb/0x310 mm/slub.c:3878 skb_free_head+0x8b/0xb0 net/core/skbuff.c:580 skb_release_data+0x329/0x400 net/core/skbuff.c:611 skb_release_all+0x4a/0x60 net/core/skbuff.c:670 __kfree_skb net/core/skbuff.c:684 [inline] consume_skb+0xc6/0x340 net/core/skbuff.c:757 netlink_broadcast_filtered+0x2ae/0x9f0 net/netlink/af_netlink.c:1479 kobject_uevent_env+0x6d8/0xb80 lib/kobject_uevent.c:316 kobject_uevent+0x1f/0x30 lib/kobject_uevent.c:374 kobject_cleanup lib/kobject.c:630 [inline] kobject_release+0x144/0x1b0 lib/kobject.c:672 kref_sub include/linux/kref.h:73 [inline] kref_put include/linux/kref.h:98 [inline] kobject_put+0x6d/0xd0 lib/kobject.c:689 net_rx_queue_update_kobjects+0x29e/0x3d0 net/core/net-sysfs.c:956 remove_queue_kobjects net/core/net-sysfs.c:1395 [inline] netdev_unregister_kobject+0x9d/0x110 net/core/net-sysfs.c:1530 rollback_registered_many+0x550/0x920 net/core/dev.c:6855 rollback_registered+0x81/0xb0 net/core/dev.c:6873 unregister_netdevice_queue+0x81/0x110 net/core/dev.c:7860 unregister_netdevice include/linux/netdevice.h:2458 [inline] __tun_detach+0x830/0xa10 drivers/net/tun.c:575 tun_detach drivers/net/tun.c:585 [inline] tun_chr_close+0x44/0x60 drivers/net/tun.c:2390 __fput+0x263/0x700 fs/file_table.c:208 ____fput+0x15/0x20 fs/file_table.c:244 task_work_run+0x10c/0x180 kernel/task_work.c:116 exit_task_work include/linux/task_work.h:21 [inline] do_exit+0x9e1/0x27c0 kernel/exit.c:837 do_group_exit+0x111/0x340 kernel/exit.c:941 SYSC_exit_group kernel/exit.c:952 [inline] SyS_exit_group+0x1d/0x20 kernel/exit.c:950 do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282 entry_SYSCALL_64_after_swapgs+0x5d/0xdb The buggy address belongs to the object at ffff8801cce06c80 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 64 bytes inside of 512-byte region [ffff8801cce06c80, ffff8801cce06e80) The buggy address belongs to the page: page:ffffea0007338180 count:1 mapcount:0 mapping: (null) index:0x0 compound_mapcount: 0 flags: 0x8000000000004080(slab|head) page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801cce06d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801cce06e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8801cce06e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8801cce06f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801cce06f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================