================================================================== BUG: KASAN: slab-out-of-bounds in __xfrm6_tunnel_spi_lookup+0x3a9/0x3b0 net/ipv6/xfrm6_tunnel.c:79 Read of size 8 at addr ffff88809d2a6ff0 by task syz-executor.1/11672 CPU: 0 PID: 11672 Comm: syz-executor.1 Not tainted 5.8.0-rc5-next-20200716-syzkaller #0 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+0x18f/0x20d lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xae/0x497 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530 __xfrm6_tunnel_spi_lookup+0x3a9/0x3b0 net/ipv6/xfrm6_tunnel.c:79 xfrm6_tunnel_spi_lookup+0x8a/0x1d0 net/ipv6/xfrm6_tunnel.c:95 xfrmi6_rcv_tunnel+0xb9/0x100 net/xfrm/xfrm_interface.c:824 tunnel46_rcv+0xef/0x2b0 net/ipv6/tunnel6.c:193 ip6_protocol_deliver_rcu+0x2e8/0x1670 net/ipv6/ip6_input.c:433 ip6_input_finish+0x7f/0x160 net/ipv6/ip6_input.c:474 NF_HOOK include/linux/netfilter.h:307 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ip6_input+0x9c/0xd0 net/ipv6/ip6_input.c:483 ip6_mc_input+0x411/0xea0 net/ipv6/ip6_input.c:577 dst_input include/net/dst.h:449 [inline] ip6_rcv_finish net/ipv6/ip6_input.c:76 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ipv6_rcv+0x28e/0x3c0 net/ipv6/ip6_input.c:307 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5287 __netif_receive_skb+0x27/0x1c0 net/core/dev.c:5401 netif_receive_skb_internal net/core/dev.c:5503 [inline] netif_receive_skb+0x159/0x990 net/core/dev.c:5562 tun_rx_batched.isra.0+0x460/0x720 drivers/net/tun.c:1518 tun_get_user+0x23b2/0x35b0 drivers/net/tun.c:1972 tun_chr_write_iter+0xba/0x151 drivers/net/tun.c:2001 call_write_iter include/linux/fs.h:1879 [inline] new_sync_write+0x422/0x650 fs/read_write.c:515 vfs_write+0x5c6/0x6f0 fs/read_write.c:595 ksys_write+0x12d/0x250 fs/read_write.c:648 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c1d9 Code: Bad RIP value. RSP: 002b:00007f71ee32dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000037740 RCX: 000000000045c1d9 RDX: 0000000000000046 RSI: 0000000020000100 RDI: 0000000000000003 RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c R13: 00007ffeae37ba0f R14: 00007f71ee32e9c0 R15: 000000000078bf0c Allocated by task 1: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461 kmalloc_node include/linux/slab.h:577 [inline] kvmalloc_node+0x61/0xf0 mm/util.c:574 kvmalloc include/linux/mm.h:760 [inline] kvzalloc include/linux/mm.h:768 [inline] v4l2_ctrl_new+0x37a/0x1940 drivers/media/v4l2-core/v4l2-ctrls.c:2613 v4l2_ctrl_new_std+0x196/0x260 drivers/media/v4l2-core/v4l2-ctrls.c:2736 vivid_create_controls+0x1962/0x36a0 drivers/media/test-drivers/vivid/vivid-ctrls.c:1783 vivid_create_instance drivers/media/test-drivers/vivid/vivid-core.c:1303 [inline] vivid_probe.cold+0x4257/0x7d2d drivers/media/test-drivers/vivid/vivid-core.c:1873 platform_drv_probe+0x87/0x140 drivers/base/platform.c:747 really_probe+0x282/0x9f0 drivers/base/dd.c:531 driver_probe_device+0xfe/0x1d0 drivers/base/dd.c:716 device_driver_attach+0x228/0x290 drivers/base/dd.c:989 __driver_attach drivers/base/dd.c:1066 [inline] __driver_attach+0xda/0x240 drivers/base/dd.c:1020 bus_for_each_dev+0x147/0x1d0 drivers/base/bus.c:305 bus_add_driver+0x348/0x5a0 drivers/base/bus.c:622 driver_register+0x220/0x3a0 drivers/base/driver.c:171 vivid_init+0x37/0x64 drivers/media/test-drivers/vivid/vivid-core.c:2001 do_one_initcall+0x10a/0x7b0 init/main.c:1201 do_initcall_level init/main.c:1274 [inline] do_initcalls init/main.c:1290 [inline] do_basic_setup init/main.c:1310 [inline] kernel_init_freeable+0x4f4/0x5a3 init/main.c:1507 kernel_init+0xd/0x1c0 init/main.c:1401 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 The buggy address belongs to the object at ffff88809d2a6c00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 496 bytes to the right of 512-byte region [ffff88809d2a6c00, ffff88809d2a6e00) The buggy address belongs to the page: page:000000009219f1b0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x9d2a6 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea000269a688 ffffea0002581cc8 ffff8880aa000600 raw: 0000000000000000 ffff88809d2a6000 0000000100000004 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809d2a6e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88809d2a6f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88809d2a6f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88809d2a7000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88809d2a7080: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc ==================================================================