Hello,

syzbot found the following crash on:

HEAD commit: 0aea6d5c Merge tag 'for-linus-5.8b-rc5-tag' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1596004f100000 kernel config: https://syzkaller.appspot.com/x/.config?x=66ad203c2bb6d8b dashboard link: https://syzkaller.appspot.com/bug?extid=4a2d01c2df834fe6e86d compiler: gcc (GCC) 10.1.0-syz 20200507 userspace arch: i386

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+4a2d01c2df834fe6e86d@syzkaller.appspotmail.com

netlink: 24 bytes leftover after parsing attributes in process `syz-executor.4'. general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] CPU: 1 PID: 11316 Comm: syz-executor.4 Not tainted 5.8.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:batadv_hardif_get_by_netdev+0x14c/0x400 net/batman-adv/hard-interface.c:72 Code: 18 00 0f 85 92 02 00 00 4d 8b 24 24 49 81 fc e0 29 4f 8d 0f 84 b4 01 00 00 e8 00 01 ab f9 49 8d 7c 24 18 48 89 f8 48 c1 e8 03 <80> 3c 18 00 0f 85 73 02 00 00 4d 39 6c 24 18 75 b7 e8 de 00 ab f9 RSP: 0018:ffffc900171aeca8 EFLAGS: 00010206 RAX: 0000000000000003 RBX: dffffc0000000000 RCX: ffffc90011a8c000 RDX: 0000000000040000 RSI: ffffffff87c8b900 RDI: 0000000000000018 RBP: ffff88802afd4000 R08: 0000000000000000 R09: ffffffff8c593a27 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff88802afd4000 R14: 0000000000000000 R15: ffffffff8aa441c0 FS: 0000000000000000(0000) GS:ffff8880ae700000(0063) knlGS:00000000f5d6db40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 000055feecf1dcd8 CR3: 0000000027b29000 CR4: 00000000001426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: batadv_hard_if_event+0x62/0x12f0 net/batman-adv/hard-interface.c:1031 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2027 call_netdevice_notifiers_extack net/core/dev.c:2039 [inline] call_netdevice_notifiers net/core/dev.c:2053 [inline] register_netdevice+0xa52/0x1540 net/core/dev.c:9509 veth_newlink+0x405/0xa00 drivers/net/veth.c:1366 __rtnl_newlink+0x1090/0x1730 net/core/rtnetlink.c:3339 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3397 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5460 netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2469 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2352 ___sys_sendmsg+0xf3/0x170 net/socket.c:2406 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2439 do_syscall_32_irqs_on+0x3f/0x60 arch/x86/entry/common.c:428 __do_fast_syscall_32 arch/x86/entry/common.c:475 [inline] do_fast_syscall_32+0x7f/0x120 arch/x86/entry/common.c:503 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f72569 Code: Bad RIP value. RSP: 002b:00000000f5d6d0cc EFLAGS: 00000296 ORIG_RAX: 0000000000000172 RAX: ffffffffffffffda RBX: 0000000000000007 RCX: 0000000020000040 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Modules linked in:

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