Subject: general protection fault in ieee802154_llsec_parse_key_id

From: syzbot <[email-masked]>
Date: Mon, 22 Feb 2021 01:24:20 -0800

Hello,

syzbot found the following issue on:

HEAD commit:    38b5133a octeontx2-pf: Fix otx2_get_fecparam()
git tree:       net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=140c2512d00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=dbc1ca9e55dc1f9f
dashboard link: https://syzkaller.appspot.com/bug?extid=d4c07de0144f6f63be3a
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13db6e22d00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13fea434d00000

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

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=168e7f02d00000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=158e7f02d00000
console output: https://syzkaller.appspot.com/x/log.txt?x=118e7f02d00000

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: 0 PID: 8431 Comm: syz-executor292 Not tainted 5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:nla_get_u16 include/net/netlink.h:1581 [inline]
RIP: 0010:nla_get_shortaddr net/ieee802154/nl-mac.c:48 [inline]
RIP: 0010:ieee802154_llsec_parse_key_id+0x17f/0x8a0 net/ieee802154/nl-mac.c:559
Code: 00 00 4d 8b 66 30 4d 85 e4 0f 84 1e 05 00 00 e8 a7 16 e8 f8 49 8d 7c 24 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 08 84 d2 0f 85 4e
RSP: 0018:ffffc900017ff4f0 EFLAGS: 00010247
RAX: dffffc0000000000 RBX: ffffc900017ff5a8 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff888ad1e9 RDI: 0000000000000004
RBP: ffffc900017ff680 R08: 0000000000000001 R09: 0000000000000000
R10: ffffffff888ad1a6 R11: 0000000000000000 R12: 0000000000000000
R13: 1ffff920002ffe9e R14: ffff888025b7c400 R15: ffffffff8da591f8
FS:  00000000008e1300(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002000030c CR3: 000000001cb7a000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 llsec_remove_key net/ieee802154/nl-mac.c:896 [inline]
 ieee802154_nl_llsec_change net/ieee802154/nl-mac.c:824 [inline]
 ieee802154_llsec_del_key+0x109/0x240 net/ieee802154/nl-mac.c:904
 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+0x44/0xa9
RIP: 0033:0x43fa99
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:00007ffce4fc0e98 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004004a0 RCX: 000000000043fa99
RDX: 0000000000004054 RSI: 0000000020000440 RDI: 0000000000000004
RBP: 0000000000403500 R08: 00000000ffffffff R09: 00000000004004a0
R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000403590
R13: 0000000000000000 R14: 00000000004ad018 R15: 00000000004004a0
Modules linked in:
---[ end trace 32b0ca68504d0ad5 ]---
RIP: 0010:nla_get_u16 include/net/netlink.h:1581 [inline]
RIP: 0010:nla_get_shortaddr net/ieee802154/nl-mac.c:48 [inline]
RIP: 0010:ieee802154_llsec_parse_key_id+0x17f/0x8a0 net/ieee802154/nl-mac.c:559
Code: 00 00 4d 8b 66 30 4d 85 e4 0f 84 1e 05 00 00 e8 a7 16 e8 f8 49 8d 7c 24 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 08 84 d2 0f 85 4e
RSP: 0018:ffffc900017ff4f0 EFLAGS: 00010247
RAX: dffffc0000000000 RBX: ffffc900017ff5a8 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff888ad1e9 RDI: 0000000000000004
RBP: ffffc900017ff680 R08: 0000000000000001 R09: 0000000000000000
R10: ffffffff888ad1a6 R11: 0000000000000000 R12: 0000000000000000
R13: 1ffff920002ffe9e R14: ffff888025b7c400 R15: ffffffff8da591f8
FS:  00000000008e1300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055bf74e6f0b8 CR3: 000000001cb7a000 CR4: 00000000001506e0
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
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches