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Eric Dumazet 1e354a809f ipv6: fix potential NULL deref in fib6_add() 
[ Upstream commit 75475bb51e78a3f54ad2f69380f2a1c985e85f2d ]

If fib6_find_prefix() returns NULL, we should silently fallback
using fib6_null_entry regardless of RT6_DEBUG value.

syzbot reported:

WARNING: CPU: 0 PID: 5477 at net/ipv6/ip6_fib.c:1516 fib6_add+0x310d/0x3fa0 net/ipv6/ip6_fib.c:1516
Modules linked in:
CPU: 0 PID: 5477 Comm: syz-executor.0 Not tainted 6.7.0-rc2-syzkaller-00029-g9b6de136b5f0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
RIP: 0010:fib6_add+0x310d/0x3fa0 net/ipv6/ip6_fib.c:1516
Code: 00 48 8b 54 24 68 e8 42 22 00 00 48 85 c0 74 14 49 89 c6 e8 d5 d3 c2 f7 eb 5d e8 ce d3 c2 f7 e9 ca 00 00 00 e8 c4 d3 c2 f7 90 <0f> 0b 90 48 b8 00 00 00 00 00 fc ff df 48 8b 4c 24 38 80 3c 01 00
RSP: 0018:ffffc90005067740 EFLAGS: 00010293
RAX: ffffffff89cba5bc RBX: ffffc90005067ab0 RCX: ffff88801a2e9dc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90005067980 R08: ffffffff89cbca85 R09: 1ffff110040d4b85
R10: dffffc0000000000 R11: ffffed10040d4b86 R12: 00000000ffffffff
R13: 1ffff110051c3904 R14: ffff8880206a5c00 R15: ffff888028e1c820
FS: 00007f763783c6c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f763783bff8 CR3: 000000007f74d000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
__ip6_ins_rt net/ipv6/route.c:1303 [inline]
ip6_route_add+0x88/0x120 net/ipv6/route.c:3847
ipv6_route_ioctl+0x525/0x7b0 net/ipv6/route.c:4467
inet6_ioctl+0x21a/0x270 net/ipv6/af_inet6.c:575
sock_do_ioctl+0x152/0x460 net/socket.c:1220
sock_ioctl+0x615/0x8c0 net/socket.c:1339
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl+0xf8/0x170 fs/ioctl.c:857
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x45/0x110 arch/x86/entry/common.c:82

Fixes: 7bbfe00e0252 ("ipv6: fix general protection fault in fib6_add()")
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Wei Wang <weiwan@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://lore.kernel.org/r/20231129160630.3509216-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-11-18 12:11:38 +01:00
..
6lowpan Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
9p 9p/trans_fd: Annotate data-racy writes to file::f_flags 2024-11-18 11:43:14 +01:00
802 Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
8021q Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
appletalk Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
atm Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ax25 Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
batman-adv Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
bluetooth Bluetooth: Fix double free in hci_conn_cleanup 2024-11-18 11:43:12 +01:00
bpf Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
bpfilter Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
bridge netfilter: nf_conntrack_bridge: initialize err to 0 2024-11-18 11:43:20 +01:00
caif Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
can can: isotp: isotp_sendmsg(): fix TX state detection and wait behavior 2024-11-18 10:58:47 +01:00
ceph libceph: use kernel_connect() 2024-11-08 11:25:50 +01:00
core net: annotate data-races around sk->sk_dst_pending_confirm 2024-11-18 11:43:12 +01:00
dcb Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
dccp dccp/tcp: Call security_inet_conn_request() after setting IPv6 addresses. 2024-11-18 11:43:07 +01:00
decnet Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
dns_resolver Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
dsa Backport mac80211 patches from linux-6.1.y 2024-06-15 16:29:20 -03:00
ethernet Backport mac80211 patches from linux-6.1.y 2024-06-15 16:29:20 -03:00
ethtool Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
hsr hsr: Prevent use after free in prp_create_tagged_frame() 2024-11-18 11:43:07 +01:00
ieee802154 Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ife Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ipv4 ipv4: igmp: fix refcnt uaf issue when receiving igmp query packet 2024-11-18 12:11:10 +01:00
ipv6 ipv6: fix potential NULL deref in fib6_add() 2024-11-18 12:11:38 +01:00
iucv Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
kcm Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
key Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
l2tp Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
l3mdev Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
lapb Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
llc llc: verify mac len before reading mac header 2024-11-18 11:43:07 +01:00
mac80211 wifi: mac80211: don't return unset power in ieee80211_get_tx_power() 2024-11-18 11:43:12 +01:00
mac802154 Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
mpls Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
mptcp Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ncm Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ncsi Revert ncsi: Propagate carrier gain/loss events to the NCSI controller 2024-11-18 11:43:30 +01:00
netfilter netfilter: ipset: fix race condition between swap/destroy and kernel side add/del/test 2024-11-18 12:11:18 +01:00
netlabel Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
netlink Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
netrom Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nfc nfc: nci: fix possible NULL pointer dereference in send_acknowledge() 2024-11-08 11:26:08 +01:00
nsh Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
openvswitch Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
packet Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
phonet Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
psample Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
qrtr Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
rds net: prevent address rewrite in kernel_bind() 2024-11-08 11:25:44 +01:00
rfkill net: rfkill: gpio: prevent value glitch during probe 2024-11-08 11:26:10 +01:00
rose Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
rxrpc Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
sched net: sched: cls_u32: Fix allocation size in u32_init() 2024-11-18 10:58:46 +01:00
sctp Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
skb_tracer Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
smc net/smc: avoid data corruption caused by decline 2024-11-18 12:10:55 +01:00
strparser Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
sunrpc SUNRPC: Fix RPC client cleaned up the freed pipefs dentries 2024-11-18 11:43:19 +01:00
switchdev Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
tipc tipc: Fix kernel-infoleak due to uninitialized TLV value 2024-11-18 11:43:19 +01:00
tls Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
unix Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
vmw_vsock Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
wimax Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
wireless wifi: cfg80211: avoid leaking stack data into trace 2024-11-08 11:26:17 +01:00
x25 Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
xdp Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
xfrm Revert "xfrm: fix a data-race in xfrm_gen_index()" 2024-11-17 19:38:56 +01:00
compat.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
devres.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
Kconfig Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
Makefile Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
socket.c net: prevent address rewrite in kernel_bind() 2024-11-08 11:25:44 +01:00
sysctl_net.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
TEST_MAPPING Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00