CVE-2021-47572

In the Linux kernel, the following vulnerability has been resolved: net:
nexthop: fix null pointer dereference when IPv6 is not enabled When we try
to add an IPv6 nexthop and IPv6 is not enabled (!CONFIG_IPV6) we’ll hit a
NULL pointer dereference[1] in the error path of nh_create_ipv6() due to
calling ipv6_stub->fib6_nh_release. The bug has been present since the
beginning of IPv6 nexthop gateway support. Commit 1aefd3de7bc6 (“ipv6: Add
fib6_nh_init and release to stubs”) tells us that only fib6_nh_init has a
dummy stub because fib6_nh_release should not be called if fib6_nh_init
returns an error, but the commit below added a call to
ipv6_stub->fib6_nh_release in its error path. To fix it return the dummy
stub’s -EAFNOSUPPORT error directly without calling
ipv6_stub->fib6_nh_release in nh_create_ipv6()'s error path. [1] Output is
a bit truncated, but it clearly shows the error. BUG: kernel NULL pointer
dereference, address: 000000000000000000 #PF: supervisor instruction fetch
in kernel modede #PF: error_code(0x0010) - not-present pagege PGD 0 P4D 0
Oops: 0010 [#1] PREEMPT SMP NOPTI CPU: 4 PID: 638 Comm: ip Kdump: loaded
Not tainted 5.16.0-rc1+ #446 Hardware name: QEMU Standard PC (i440FX +
PIIX, 1996), BIOS 1.14.0-4.fc34 04/01/2014 RIP: 0010:0x0 Code: Unable to
access opcode bytes at RIP 0xffffffffffffffd6. RSP: 0018:ffff888109f5b8f0
EFLAGS: 00010286^Ac RAX: 0000000000000000 RBX: ffff888109f5ba28 RCX:
0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI:
ffff8881008a2860 RBP: ffff888109f5b9d8 R08: 0000000000000000 R09:
0000000000000000 R10: ffff888109f5b978 R11: ffff888109f5b948 R12:
00000000ffffff9f R13: ffff8881008a2a80 R14: ffff8881008a2860 R15:
ffff8881008a2840 FS: 00007f98de70f100(0000) GS:ffff88822bf00000(0000)
knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 0000000100efc000 CR4: 00000000000006e0 Call
Trace: <TASK> nh_create_ipv6+0xed/0x10c rtm_new_nexthop+0x6d7/0x13f3 ?
check_preemption_disabled+0x3d/0xf2 ? lock_is_held_type+0xbe/0xfd
rtnetlink_rcv_msg+0x23f/0x26a ? check_preemption_disabled+0x3d/0xf2 ?
rtnl_calcit.isra.0+0x147/0x147 netlink_rcv_skb+0x61/0xb2
netlink_unicast+0x100/0x187 netlink_sendmsg+0x37f/0x3a0 ?
netlink_unicast+0x187/0x187 sock_sendmsg_nosec+0x67/0x9b
____sys_sendmsg+0x19d/0x1f9 ? copy_msghdr_from_user+0x4c/0x5e ?
rcu_read_lock_any_held+0x2a/0x78 ___sys_sendmsg+0x6c/0x8c ?
asm_sysvec_apic_timer_interrupt+0x12/0x20 ? lockdep_hardirqs_on+0xd9/0x102
? sockfd_lookup_light+0x69/0x99 __sys_sendmsg+0x50/0x6e
do_syscall_64+0xcb/0xf2 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP:
0033:0x7f98dea28914 Code: 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b5 0f
1f 80 00 00 00 00 48 8d 05 e9 5d 0c 00 8b 00 85 c0 75 13 b8 2e 00 00 00 0f
05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 41 54 41 89 d4 55 48 89 f5 53 RSP:
002b:00007fff859f5e68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e2e RAX:
ffffffffffffffda RBX: 00000000619cb810 RCX: 00007f98dea28914 RDX:
0000000000000000 RSI: 00007fff859f5ed0 RDI: 0000000000000003 RBP:
0000000000000000 R08: 0000000000000001 R09: 0000000000000008 R10:
fffffffffffffce6 R11: 0000000000000246 R12: 0000000000000001 R13:
000055c0097ae520 R14: 000055c0097957fd R15: 00007fff859f63a0 </TASK>
Modules linked in: bridge stp llc bonding virtio_net