Subject: general protection fault in ieee802154_llsec_parse_dev_addr

From: syzbot <[email-masked]>
Date: Thu, 25 Feb 2021 08:47:23 -0800

Hello,

syzbot found the following issue on:

HEAD commit:    fcb30073 Merge branch 'wireguard-fixes-for-5-12-rc1'
git tree:       net
console output: https://syzkaller.appspot.com/x/log.txt?x=148f1646d00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=2b8307379601586a
dashboard link: https://syzkaller.appspot.com/bug?extid=8b6719da8a04beeafcc3
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=122a61a8d00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1648d632d00000

Bisection is inconclusive: the issue happens on the oldest tested release.

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=10406466d00000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=12406466d00000
console output: https://syzkaller.appspot.com/x/log.txt?x=14406466d00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: [email-masked]

general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 PID: 8419 Comm: syz-executor652 Not tainted 5.11.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:nla_get_le16 include/net/netlink.h:1599 [inline]
RIP: 0010:ieee802154_llsec_parse_dev_addr+0x2b3/0x370 net/ieee802154/nl802154.c:1306
Code: 00 0f 85 d5 00 00 00 48 89 5d 08 e9 5c ff ff ff e8 72 2e e4 f8 49 8d 7e 04 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 01 38 d0 7c 04 84 d2 75 7d 48
RSP: 0018:ffffc90001797390 EFLAGS: 00010247
RAX: dffffc0000000000 RBX: 0000000000000002 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff888eab3e RDI: 0000000000000004
RBP: ffffc90001797590 R08: ffffffff8a8934e0 R09: ffffffff888eaa81
R10: 0000000000000002 R11: 0000000000000002 R12: 1ffff920002f2e72
R13: 0000000000000000 R14: 0000000000000000 R15: ffff88802171cc78
FS:  00000000016b2300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000408 CR3: 000000001360f000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ieee802154_llsec_parse_key_id+0x343/0x410 net/ieee802154/nl802154.c:1344
 nl802154_set_llsec_params+0x1db/0x470 net/ieee802154/nl802154.c:1399
 genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:739
 genl_family_rcv_msg net/netlink/genetlink.c:783 [inline]
 genl_rcv_msg+0x328/0x580 net/netlink/genetlink.c:800
 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2502
 genl_rcv+0x24/0x40 net/netlink/genetlink.c:811
 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1338
 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1927
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:672
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2348
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2402
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2435
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x43fc09
Code: 28 c3 e8 5a 14 00 00 66 2e 0f 1f 84 00 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffed214c208 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004004a0 RCX: 000000000043fc09
RDX: 0000000000000040 RSI: 0000000020000680 RDI: 0000000000000003
RBP: 0000000000403670 R08: 0000000000000004 R09: 00000000004004a0
R10: 000000000000000c R11: 0000000000000246 R12: 0000000000403700
R13: 0000000000000000 R14: 00000000004ad018 R15: 00000000004004a0
Modules linked in:
---[ end trace 20aa2d549964b50b ]---
RIP: 0010:nla_get_le16 include/net/netlink.h:1599 [inline]
RIP: 0010:ieee802154_llsec_parse_dev_addr+0x2b3/0x370 net/ieee802154/nl802154.c:1306
Code: 00 0f 85 d5 00 00 00 48 89 5d 08 e9 5c ff ff ff e8 72 2e e4 f8 49 8d 7e 04 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 01 38 d0 7c 04 84 d2 75 7d 48
RSP: 0018:ffffc90001797390 EFLAGS: 00010247
RAX: dffffc0000000000 RBX: 0000000000000002 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff888eab3e RDI: 0000000000000004
RBP: ffffc90001797590 R08: ffffffff8a8934e0 R09: ffffffff888eaa81
R10: 0000000000000002 R11: 0000000000000002 R12: 1ffff920002f2e72
R13: 0000000000000000 R14: 0000000000000000 R15: ffff88802171cc78
FS:  00000000016b2300(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3256d2dab4 CR3: 000000001360f000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

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For information about bisection process see: https://goo.gl/tpsmEJ#bisection
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https://goo.gl/tpsmEJ#testing-patches