================================================================== BUG: KASAN: use-after-free in batadv_interface_tx+0x1194/0x1880 net/batman-adv/soft-interface.c:226 Read of size 2 at addr ffff88809925294b by task syz-executor5/6868 CPU: 1 PID: 6868 Comm: syz-executor5 Not tainted 5.0.0-rc1+ #20 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+0x1db/0x2d0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 __asan_report_load_n_noabort+0xf/0x20 mm/kasan/generic_report.c:145 batadv_interface_tx+0x1194/0x1880 net/batman-adv/soft-interface.c:226 kernel msg: ebtables bug: please report to author: counter_offset != totalcnt __netdev_start_xmit include/linux/netdevice.h:4382 [inline] netdev_start_xmit include/linux/netdevice.h:4391 [inline] dev_direct_xmit+0x368/0x670 net/core/dev.c:3930 packet_direct_xmit+0xfb/0x170 net/packet/af_packet.c:246 packet_snd net/packet/af_packet.c:2932 [inline] packet_sendmsg+0x2753/0x6830 net/packet/af_packet.c:2957 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:631 sock_write_iter+0x379/0x5e0 net/socket.c:900 call_write_iter include/linux/fs.h:1862 [inline] aio_write+0x3ba/0x640 fs/aio.c:1581 __io_submit_one fs/aio.c:1860 [inline] io_submit_one+0xbd4/0x1050 fs/aio.c:1908 __do_sys_io_submit fs/aio.c:1953 [inline] __se_sys_io_submit fs/aio.c:1923 [inline] __x64_sys_io_submit+0x1c4/0x5d0 fs/aio.c:1923 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457ec9 Code: 6d b7 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 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fdaec3f2c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457ec9 RDX: 0000000020000080 RSI: 0000000000000001 RDI: 00007fdaec3d2000 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fdaec3f36d4 R13: 00000000004bf0eb R14: 00000000004d06b8 R15: 00000000ffffffff Allocated by task 8102: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_kmalloc mm/kasan/common.c:496 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:469 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:504 kmem_cache_alloc_node_trace+0x153/0x720 mm/slab.c:3652 kmalloc_node include/linux/slab.h:583 [inline] alloc_vmap_area+0x142/0xa40 mm/vmalloc.c:419 __get_vm_area_node+0x179/0x3a0 mm/vmalloc.c:1396 __vmalloc_node_range+0x191/0x910 mm/vmalloc.c:1745 __vmalloc_node mm/vmalloc.c:1795 [inline] __vmalloc_node_flags mm/vmalloc.c:1809 [inline] vzalloc+0x6b/0x90 mm/vmalloc.c:1848 alloc_counters.isra.0+0xb7/0x830 net/ipv4/netfilter/ip_tables.c:803 copy_entries_to_user net/ipv4/netfilter/ip_tables.c:825 [inline] get_entries net/ipv4/netfilter/ip_tables.c:1027 [inline] do_ipt_get_ctl+0x71a/0xbd0 net/ipv4/netfilter/ip_tables.c:1703 nf_sockopt net/netfilter/nf_sockopt.c:104 [inline] nf_getsockopt+0x80/0xe0 net/netfilter/nf_sockopt.c:122 ip_getsockopt net/ipv4/ip_sockglue.c:1576 [inline] ip_getsockopt+0x1bd/0x260 net/ipv4/ip_sockglue.c:1556 tcp_getsockopt net/ipv4/tcp.c:3591 [inline] tcp_getsockopt+0x95/0xf0 net/ipv4/tcp.c:3585 sock_common_getsockopt+0x9a/0xe0 net/core/sock.c:2950 __sys_getsockopt+0x196/0x370 net/socket.c:1939 __do_sys_getsockopt net/socket.c:1950 [inline] __se_sys_getsockopt net/socket.c:1947 [inline] __x64_sys_getsockopt+0xbe/0x150 net/socket.c:1947 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 16: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:458 kasan_slab_free+0xe/0x10 mm/kasan/common.c:466 __cache_free mm/slab.c:3487 [inline] kfree+0xcf/0x230 mm/slab.c:3806 __rcu_reclaim kernel/rcu/rcu.h:233 [inline] rcu_do_batch kernel/rcu/tree.c:2452 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2773 [inline] rcu_process_callbacks+0xd76/0x1680 kernel/rcu/tree.c:2754 __do_softirq+0x30b/0xb11 kernel/softirq.c:292 The buggy address belongs to the object at ffff888099252900 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 75 bytes inside of 96-byte region [ffff888099252900, ffff888099252960) The buggy address belongs to the page: page:ffffea0002649480 count:1 mapcount:0 mapping:ffff88812c3f04c0 index:0xffff888099252b80 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea000282abc8 ffffea0002434448 ffff88812c3f04c0 raw: ffff888099252b80 ffff888099252000 0000000100000018 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888099252800: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff888099252880: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc >ffff888099252900: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff888099252980: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff888099252a00: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ==================================================================