================================================================== BUG: KASAN: use-after-free in eth_header_parse_protocol+0xad/0xd0 net/ethernet/eth.c:282 Read of size 2 at addr ffff8881e9ae6c0b by task syz-executor.4/6451 CPU: 1 PID: 6451 Comm: syz-executor.4 Tainted: G W 5.4.111-syzkaller-00141-gce6a5172613f #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:3016 [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] aio_write+0x47b/0x610 fs/aio.c:1584 __io_submit_one fs/aio.c:1843 [inline] io_submit_one+0xa59/0x2300 fs/aio.c:1886 __do_sys_io_submit fs/aio.c:1945 [inline] __se_sys_io_submit+0x189/0x3d0 fs/aio.c:1915 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:00007f15ad8f1188 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459 RDX: 0000000020000080 RSI: 0000000000000001 RDI: 00007f15ad8d0000 RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffe00a4ac9f R14: 00007f15ad8f1300 R15: 0000000000022000 Allocated by task 6053: 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] kmem_cache_alloc+0x115/0x290 mm/slub.c:2834 do_blockdev_direct_IO fs/direct-io.c:1212 [inline] __blockdev_direct_IO+0x38b/0x48d0 fs/direct-io.c:1425 ext4_direct_IO_write fs/ext4/inode.c:3790 [inline] ext4_direct_IO+0x1010/0x2200 fs/ext4/inode.c:3952 generic_file_direct_write+0x462/0x6d0 mm/filemap.c:3195 __generic_file_write_iter+0x298/0x480 mm/filemap.c:3378 ext4_file_write_iter+0x93c/0x10e0 fs/ext4/file.c:270 do_iter_readv_writev+0x547/0x750 include/linux/fs.h:1965 do_iter_write+0x16f/0x570 fs/read_write.c:970 iter_file_splice_write+0x79a/0xf20 fs/splice.c:746 splice_direct_to_actor+0x4b4/0xb30 fs/splice.c:976 do_splice_direct+0x28b/0x3e0 fs/splice.c:1064 do_sendfile+0x8e4/0x1140 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1525 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0x1c4/0x220 fs/read_write.c:1511 do_syscall_64+0xcb/0x1e0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 6053: 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] kmem_cache_free+0xb8/0x5f0 mm/slub.c:3088 dio_complete+0x552/0x6e0 fs/direct-io.c:334 do_blockdev_direct_IO fs/direct-io.c:1399 [inline] __blockdev_direct_IO+0x418d/0x48d0 fs/direct-io.c:1425 ext4_direct_IO_write fs/ext4/inode.c:3790 [inline] ext4_direct_IO+0x1010/0x2200 fs/ext4/inode.c:3952 generic_file_direct_write+0x462/0x6d0 mm/filemap.c:3195 __generic_file_write_iter+0x298/0x480 mm/filemap.c:3378 ext4_file_write_iter+0x93c/0x10e0 fs/ext4/file.c:270 do_iter_readv_writev+0x547/0x750 include/linux/fs.h:1965 do_iter_write+0x16f/0x570 fs/read_write.c:970 iter_file_splice_write+0x79a/0xf20 fs/splice.c:746 splice_direct_to_actor+0x4b4/0xb30 fs/splice.c:976 do_splice_direct+0x28b/0x3e0 fs/splice.c:1064 do_sendfile+0x8e4/0x1140 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1525 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0x1c4/0x220 fs/read_write.c:1511 do_syscall_64+0xcb/0x1e0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff8881e9ae6a00 which belongs to the cache dio of size 640 The buggy address is located 523 bytes inside of 640-byte region [ffff8881e9ae6a00, ffff8881e9ae6c80) The buggy address belongs to the page: page:ffffea0007a6b900 refcount:1 mapcount:0 mapping:ffff8881f5f9d400 index:0x0 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f5f9d400 raw: 0000000000000000 0000000000150015 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881e9ae6b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881e9ae6b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881e9ae6c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881e9ae6c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881e9ae6d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================