================================================================== BUG: KASAN: slab-out-of-bounds in eth_header_parse_protocol+0xad/0xd0 net/ethernet/eth.c:282 Read of size 2 at addr ffff8881ef3c040b by task syz-executor.4/663 CPU: 0 PID: 663 Comm: syz-executor.4 Not tainted 5.4.110-syzkaller-00108-g2c6775a89bc1 #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+0x1d8/0x24e lib/dump_stack.c:118 print_address_description+0x9b/0x650 mm/kasan/report.c:384 __kasan_report+0x182/0x260 mm/kasan/report.c:516 kasan_report+0x30/0x60 mm/kasan/common.c:641 eth_header_parse_protocol+0xad/0xd0 net/ethernet/eth.c:282 dev_parse_header_protocol include/linux/netdevice.h:2984 [inline] virtio_net_hdr_to_skb+0x6de/0xd70 include/linux/virtio_net.h:83 packet_snd net/packet/af_packet.c:2976 [inline] packet_sendmsg+0x483a/0x6780 net/packet/af_packet.c:3013 sock_sendmsg_nosec net/socket.c:638 [inline] sock_sendmsg net/socket.c:658 [inline] sock_write_iter+0x330/0x450 net/socket.c:990 call_write_iter include/linux/fs.h:1971 [inline] new_sync_write fs/read_write.c:483 [inline] __vfs_write+0x5ec/0x780 fs/read_write.c:496 vfs_write+0x212/0x4e0 fs/read_write.c:558 ksys_write+0x186/0x2b0 fs/read_write.c:611 do_syscall_64+0xcb/0x1e0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x466459 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fdeb4ba4188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459 RDX: 000000000000005a RSI: 0000000020000100 RDI: 0000000000000003 RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007fff1c63893f R14: 00007fdeb4ba4300 R15: 0000000000022000 Allocated by task 342: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x137/0x1e0 mm/kasan/common.c:517 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2821 [inline] slab_alloc mm/slub.c:2829 [inline] __kmalloc_track_caller+0x13a/0x2e0 mm/slub.c:4439 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0xaf/0x4d0 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1057 [inline] __tcp_send_ack+0x9a/0x580 net/ipv4/tcp_output.c:3704 tcp_recvmsg+0x21fa/0x3790 net/ipv4/tcp.c:2192 inet_recvmsg+0x157/0x500 net/ipv4/af_inet.c:842 sock_recvmsg_nosec net/socket.c:872 [inline] sock_recvmsg net/socket.c:890 [inline] sock_read_iter+0x34a/0x430 net/socket.c:968 call_read_iter include/linux/fs.h:1965 [inline] new_sync_read fs/read_write.c:414 [inline] __vfs_read+0x5e9/0x770 fs/read_write.c:427 vfs_read+0x161/0x370 fs/read_write.c:461 ksys_read+0x186/0x2b0 fs/read_write.c:587 do_syscall_64+0xcb/0x1e0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 342: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] kasan_set_free_info mm/kasan/common.c:333 [inline] __kasan_slab_free+0x18a/0x240 mm/kasan/common.c:475 slab_free_hook mm/slub.c:1454 [inline] slab_free_freelist_hook+0x7b/0x150 mm/slub.c:1492 slab_free mm/slub.c:3072 [inline] kfree+0xe0/0x660 mm/slub.c:4061 skb_release_all net/core/skbuff.c:675 [inline] _kfree_skb_defer net/core/skbuff.c:884 [inline] napi_consume_skb+0x12c/0x3e0 net/core/skbuff.c:929 free_old_xmit_skbs+0x12b/0x2b0 drivers/net/virtio_net.c:1373 virtnet_poll_cleantx drivers/net/virtio_net.c:1416 [inline] virtnet_poll+0x314/0xe40 drivers/net/virtio_net.c:1433 napi_poll+0x195/0x670 net/core/dev.c:6315 net_rx_action+0x41c/0xb90 net/core/dev.c:6383 __do_softirq+0x23e/0x615 kernel/softirq.c:292 The buggy address belongs to the object at ffff8881ef3c0000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 11 bytes to the right of 1024-byte region [ffff8881ef3c0000, ffff8881ef3c0400) The buggy address belongs to the page: page:ffffea0007bcf000 refcount:1 mapcount:0 mapping:ffff8881f5c02280 index:0xffff8881ef3c6800 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 ffff8881f5c00b10 ffffea0007bc2008 ffff8881f5c02280 raw: ffff8881ef3c6800 0000000000100001 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881ef3c0300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881ef3c0380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881ef3c0400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8881ef3c0480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881ef3c0500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================