================================================================== BUG: KASAN: slab-out-of-bounds in _decode_session6+0x134a/0x1500 net/ipv6/xfrm6_policy.c:161 Read of size 1 at addr ffff8801bc8eef07 by task syz-executor3/14863 CPU: 1 PID: 14863 Comm: syz-executor3 Not tainted 4.19.0+ #134 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+0x244/0x39d lib/dump_stack.c:113 print_address_description.cold.7+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.8+0x242/0x309 mm/kasan/report.c:412 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:430 _decode_session6+0x134a/0x1500 net/ipv6/xfrm6_policy.c:161 __xfrm_decode_session+0x71/0x140 net/xfrm/xfrm_policy.c:2299 xfrm_decode_session include/net/xfrm.h:1232 [inline] vti_tunnel_xmit+0x1b1/0x1730 net/ipv4/ip_vti.c:252 __netdev_start_xmit include/linux/netdevice.h:4336 [inline] netdev_start_xmit include/linux/netdevice.h:4345 [inline] xmit_one net/core/dev.c:3252 [inline] dev_hard_start_xmit+0x295/0xc90 net/core/dev.c:3268 __dev_queue_xmit+0x2f71/0x3ad0 net/core/dev.c:3838 dev_queue_xmit+0x17/0x20 net/core/dev.c:3871 __bpf_tx_skb net/core/filter.c:2017 [inline] __bpf_redirect_common net/core/filter.c:2055 [inline] __bpf_redirect+0x5cf/0xb20 net/core/filter.c:2062 ____bpf_clone_redirect net/core/filter.c:2095 [inline] bpf_clone_redirect+0x2f6/0x490 net/core/filter.c:2067 bpf_prog_c43b17cda12376d2+0x71a/0x1000 Allocated by task 14863: 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 __do_kmalloc mm/slab.c:3718 [inline] __kmalloc+0x14e/0x760 mm/slab.c:3727 kmalloc include/linux/slab.h:518 [inline] kzalloc include/linux/slab.h:707 [inline] bpf_test_init.isra.10+0x98/0x100 net/bpf/test_run.c:100 bpf_prog_test_run_skb+0x103/0xcb0 net/bpf/test_run.c:124 bpf_prog_test_run+0x130/0x1a0 kernel/bpf/syscall.c:1870 __do_sys_bpf kernel/bpf/syscall.c:2507 [inline] __se_sys_bpf kernel/bpf/syscall.c:2451 [inline] __x64_sys_bpf+0x3d8/0x520 kernel/bpf/syscall.c:2451 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 14092: 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] kfree+0xcf/0x230 mm/slab.c:3813 skb_free_head+0x99/0xc0 net/core/skbuff.c:550 skb_release_data+0x6a4/0x880 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+0x1ae/0x570 net/core/skbuff.c:701 netlink_broadcast_filtered+0x6e6/0x1680 net/netlink/af_netlink.c:1512 netlink_broadcast net/netlink/af_netlink.c:1534 [inline] nlmsg_multicast include/net/netlink.h:734 [inline] nlmsg_notify+0xa0/0x1a0 net/netlink/af_netlink.c:2520 rtnl_notify+0xce/0xf0 net/core/rtnetlink.c:742 inet_netconf_notify_devconf+0x146/0x260 net/ipv4/devinet.c:2046 __devinet_sysctl_register+0x1f3/0x2b0 net/ipv4/devinet.c:2485 devinet_sysctl_register+0x163/0x220 net/ipv4/devinet.c:2519 inetdev_init+0x2df/0x590 net/ipv4/devinet.c:274 inetdev_event+0xf47/0x1380 net/ipv4/devinet.c:1479 notifier_call_chain+0x17e/0x380 kernel/notifier.c:93 __raw_notifier_call_chain kernel/notifier.c:394 [inline] raw_notifier_call_chain+0x2d/0x40 kernel/notifier.c:401 call_netdevice_notifiers_info+0x3f/0x90 net/core/dev.c:1733 call_netdevice_notifiers net/core/dev.c:1751 [inline] register_netdevice+0xb98/0x11d0 net/core/dev.c:8558 tun_set_iff drivers/net/tun.c:2784 [inline] __tun_chr_ioctl+0x2b16/0x46e0 drivers/net/tun.c:3018 tun_chr_ioctl+0x2a/0x40 drivers/net/tun.c:3282 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:685 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:702 __do_sys_ioctl fs/ioctl.c:709 [inline] __se_sys_ioctl fs/ioctl.c:707 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:707 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 ffff8801bc8eed00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 7 bytes to the right of 512-byte region [ffff8801bc8eed00, ffff8801bc8eef00) The buggy address belongs to the page: page:ffffea0006f23b80 count:1 mapcount:0 mapping:ffff8801da800940 index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea00074ec4c8 ffffea0006e749c8 ffff8801da800940 raw: 0000000000000000 ffff8801bc8ee080 0000000100000006 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801bc8eee00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801bc8eee80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8801bc8eef00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8801bc8eef80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801bc8ef000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================