device bridge_slave_1 left promiscuous mode bridge0: port 2(bridge_slave_1) entered disabled state device bridge_slave_0 left promiscuous mode bridge0: port 1(bridge_slave_0) entered disabled state ================================================================== BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:345 [inline] BUG: KASAN: slab-out-of-bounds in pdu_read+0x90/0xd0 net/9p/protocol.c:59 Read of size 65417 at addr ffff88019a27c52d by task syz-executor0/8825 CPU: 0 PID: 8825 Comm: syz-executor0 Not tainted 4.18.0-rc5-next-20180720+ #12 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+0x1c9/0x2b4 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x30d mm/kasan/report.c:412 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267 memcpy+0x23/0x50 mm/kasan/kasan.c:302 memcpy include/linux/string.h:345 [inline] pdu_read+0x90/0xd0 net/9p/protocol.c:59 p9pdu_vreadf net/9p/protocol.c:162 [inline] p9pdu_readf+0x579/0x2170 net/9p/protocol.c:536 p9_client_version net/9p/client.c:900 [inline] p9_client_create+0x6d0/0x1537 net/9p/client.c:974 v9fs_session_init+0x21a/0x1a80 fs/9p/v9fs.c:400 v9fs_mount+0x7c/0x900 fs/9p/vfs_super.c:135 legacy_get_tree+0x131/0x460 fs/fs_context.c:674 vfs_get_tree+0x1cb/0x5c0 fs/super.c:1743 do_new_mount fs/namespace.c:2603 [inline] do_mount+0x6f2/0x1e20 fs/namespace.c:2927 ksys_mount+0x12d/0x140 fs/namespace.c:3143 __do_sys_mount fs/namespace.c:3157 [inline] __se_sys_mount fs/namespace.c:3154 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3154 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455ab9 Code: 1d ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fecd1026c68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fecd10276d4 RCX: 0000000000455ab9 RDX: 0000000020000100 RSI: 0000000020000000 RDI: 0000000000000000 RBP: 000000000072bf48 R08: 0000000020000240 R09: 0000000000000000 R10: 0000000000000800 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004c0201 R14: 00000000004cfe50 R15: 0000000000000001 Allocated by task 8825: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 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] p9_fcall_alloc+0x1e/0x90 net/9p/client.c:237 p9_tag_alloc net/9p/client.c:267 [inline] p9_client_prepare_req.part.8+0x132/0xa00 net/9p/client.c:640 p9_client_prepare_req net/9p/client.c:675 [inline] p9_client_rpc+0x242/0x1330 net/9p/client.c:675 p9_client_version net/9p/client.c:890 [inline] p9_client_create+0xca4/0x1537 net/9p/client.c:974 v9fs_session_init+0x21a/0x1a80 fs/9p/v9fs.c:400 v9fs_mount+0x7c/0x900 fs/9p/vfs_super.c:135 legacy_get_tree+0x131/0x460 fs/fs_context.c:674 vfs_get_tree+0x1cb/0x5c0 fs/super.c:1743 do_new_mount fs/namespace.c:2603 [inline] do_mount+0x6f2/0x1e20 fs/namespace.c:2927 ksys_mount+0x12d/0x140 fs/namespace.c:3143 __do_sys_mount fs/namespace.c:3157 [inline] __se_sys_mount fs/namespace.c:3154 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3154 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 4447: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xd9/0x260 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+0x15/0x20 net/core/skbuff.c:641 sk_wmem_free_skb include/net/sock.h:1447 [inline] tcp_rtx_queue_unlink_and_free include/net/tcp.h:1699 [inline] tcp_clean_rtx_queue net/ipv4/tcp_input.c:3145 [inline] tcp_ack+0x2084/0x56d0 net/ipv4/tcp_input.c:3670 tcp_rcv_established+0x14b3/0x21a0 net/ipv4/tcp_input.c:5507 tcp_v4_do_rcv+0x635/0x8f0 net/ipv4/tcp_ipv4.c:1532 tcp_v4_rcv+0x2ff9/0x3a90 net/ipv4/tcp_ipv4.c:1824 ip_local_deliver_finish+0x2eb/0xda0 net/ipv4/ip_input.c:215 NF_HOOK include/linux/netfilter.h:287 [inline] ip_local_deliver+0x1e9/0x750 net/ipv4/ip_input.c:256 dst_input include/net/dst.h:450 [inline] ip_rcv_finish+0x1f9/0x300 net/ipv4/ip_input.c:415 NF_HOOK include/linux/netfilter.h:287 [inline] ip_rcv+0xed/0x610 net/ipv4/ip_input.c:524 __netif_receive_skb_one_core+0x14d/0x200 net/core/dev.c:4878 __netif_receive_skb+0x2c/0x1e0 net/core/dev.c:4988 netif_receive_skb_internal+0x12e/0x5f0 net/core/dev.c:5091 napi_skb_finish net/core/dev.c:5550 [inline] napi_gro_receive+0x465/0x5c0 net/core/dev.c:5581 IPVS: ftp: loaded support on port[0] = 21 receive_buf+0xc97/0x2bf0 drivers/net/virtio_net.c:996 virtnet_receive drivers/net/virtio_net.c:1252 [inline] virtnet_poll+0x3de/0xe5c drivers/net/virtio_net.c:1334 napi_poll net/core/dev.c:6209 [inline] net_rx_action+0x7a5/0x1920 net/core/dev.c:6275 __do_softirq+0x2e8/0xb17 kernel/softirq.c:292 The buggy address belongs to the object at ffff88019a27c500 which belongs to the cache kmalloc-2048 of size 2048 The buggy address is located 45 bytes inside of 2048-byte region [ffff88019a27c500, ffff88019a27cd00) The buggy address belongs to the page: page:ffffea0006689f00 count:1 mapcount:0 mapping:ffff8801da800c40 index:0xffff88019a27cd80 compound_mapcount: 0 flags: 0x2fffc0000010200(slab|head) raw: 02fffc0000010200 ffffea000664b388 ffffea00066da288 ffff8801da800c40 raw: ffff88019a27cd80 ffff88019a27c500 0000000100000002 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88019a27c980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88019a27ca00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88019a27ca80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 05 ^ ffff88019a27cb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88019a27cb80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================