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17af420545
syzbot reported a problem in ip6erspan_rcv() [1]
Issue is that ip6erspan_rcv() (and erspan_rcv()) no longer make
sure erspan_base_hdr is present in skb linear part (skb->head)
before getting @ver field from it.
Add the missing pskb_may_pull() calls.
v2: Reload iph pointer in erspan_rcv() after pskb_may_pull()
because skb->head might have changed.
[1]
BUG: KMSAN: uninit-value in pskb_may_pull_reason include/linux/skbuff.h:2742 [inline]
BUG: KMSAN: uninit-value in pskb_may_pull include/linux/skbuff.h:2756 [inline]
BUG: KMSAN: uninit-value in ip6erspan_rcv net/ipv6/ip6_gre.c:541 [inline]
BUG: KMSAN: uninit-value in gre_rcv+0x11f8/0x1930 net/ipv6/ip6_gre.c:610
pskb_may_pull_reason include/linux/skbuff.h:2742 [inline]
pskb_may_pull include/linux/skbuff.h:2756 [inline]
ip6erspan_rcv net/ipv6/ip6_gre.c:541 [inline]
gre_rcv+0x11f8/0x1930 net/ipv6/ip6_gre.c:610
ip6_protocol_deliver_rcu+0x1d4c/0x2ca0 net/ipv6/ip6_input.c:438
ip6_input_finish net/ipv6/ip6_input.c:483 [inline]
NF_HOOK include/linux/netfilter.h:314 [inline]
ip6_input+0x15d/0x430 net/ipv6/ip6_input.c:492
ip6_mc_input+0xa7e/0xc80 net/ipv6/ip6_input.c:586
dst_input include/net/dst.h:460 [inline]
ip6_rcv_finish+0x955/0x970 net/ipv6/ip6_input.c:79
NF_HOOK include/linux/netfilter.h:314 [inline]
ipv6_rcv+0xde/0x390 net/ipv6/ip6_input.c:310
__netif_receive_skb_one_core net/core/dev.c:5538 [inline]
__netif_receive_skb+0x1da/0xa00 net/core/dev.c:5652
netif_receive_skb_internal net/core/dev.c:5738 [inline]
netif_receive_skb+0x58/0x660 net/core/dev.c:5798
tun_rx_batched+0x3ee/0x980 drivers/net/tun.c:1549
tun_get_user+0x5566/0x69e0 drivers/net/tun.c:2002
tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048
call_write_iter include/linux/fs.h:2108 [inline]
new_sync_write fs/read_write.c:497 [inline]
vfs_write+0xb63/0x1520 fs/read_write.c:590
ksys_write+0x20f/0x4c0 fs/read_write.c:643
__do_sys_write fs/read_write.c:655 [inline]
__se_sys_write fs/read_write.c:652 [inline]
__x64_sys_write+0x93/0xe0 fs/read_write.c:652
do_syscall_64+0xd5/0x1f0
entry_SYSCALL_64_after_hwframe+0x6d/0x75
Uninit was created at:
slab_post_alloc_hook mm/slub.c:3804 [inline]
slab_alloc_node mm/slub.c:3845 [inline]
kmem_cache_alloc_node+0x613/0xc50 mm/slub.c:3888
kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:577
__alloc_skb+0x35b/0x7a0 net/core/skbuff.c:668
alloc_skb include/linux/skbuff.h:1318 [inline]
alloc_skb_with_frags+0xc8/0xbf0 net/core/skbuff.c:6504
sock_alloc_send_pskb+0xa81/0xbf0 net/core/sock.c:2795
tun_alloc_skb drivers/net/tun.c:1525 [inline]
tun_get_user+0x209a/0x69e0 drivers/net/tun.c:1846
tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048
call_write_iter include/linux/fs.h:2108 [inline]
new_sync_write fs/read_write.c:497 [inline]
vfs_write+0xb63/0x1520 fs/read_write.c:590
ksys_write+0x20f/0x4c0 fs/read_write.c:643
__do_sys_write fs/read_write.c:655 [inline]
__se_sys_write fs/read_write.c:652 [inline]
__x64_sys_write+0x93/0xe0 fs/read_write.c:652
do_syscall_64+0xd5/0x1f0
entry_SYSCALL_64_after_hwframe+0x6d/0x75
CPU: 1 PID: 5045 Comm: syz-executor114 Not tainted 6.9.0-rc1-syzkaller-00021-g962490525cff #0
Fixes:
|
||
---|---|---|
.. | ||
ila | ||
netfilter | ||
addrconf.c | ||
addrconf_core.c | ||
addrlabel.c | ||
af_inet6.c | ||
ah6.c | ||
anycast.c | ||
calipso.c | ||
datagram.c | ||
esp6.c | ||
esp6_offload.c | ||
exthdrs.c | ||
exthdrs_core.c | ||
exthdrs_offload.c | ||
fib6_notifier.c | ||
fib6_rules.c | ||
fou6.c | ||
icmp.c | ||
inet6_connection_sock.c | ||
inet6_hashtables.c | ||
ioam6.c | ||
ioam6_iptunnel.c | ||
ip6_checksum.c | ||
ip6_fib.c | ||
ip6_flowlabel.c | ||
ip6_gre.c | ||
ip6_icmp.c | ||
ip6_input.c | ||
ip6_offload.c | ||
ip6_offload.h | ||
ip6_output.c | ||
ip6_tunnel.c | ||
ip6_udp_tunnel.c | ||
ip6_vti.c | ||
ip6mr.c | ||
ipcomp6.c | ||
ipv6_sockglue.c | ||
Kconfig | ||
Makefile | ||
mcast.c | ||
mcast_snoop.c | ||
mip6.c | ||
ndisc.c | ||
netfilter.c | ||
output_core.c | ||
ping.c | ||
proc.c | ||
protocol.c | ||
raw.c | ||
reassembly.c | ||
route.c | ||
rpl.c | ||
rpl_iptunnel.c | ||
seg6.c | ||
seg6_hmac.c | ||
seg6_iptunnel.c | ||
seg6_local.c | ||
sit.c | ||
syncookies.c | ||
sysctl_net_ipv6.c | ||
tcp_ao.c | ||
tcp_ipv6.c | ||
tcpv6_offload.c | ||
tunnel6.c | ||
udp.c | ||
udp_impl.h | ||
udp_offload.c | ||
udplite.c | ||
xfrm6_input.c | ||
xfrm6_output.c | ||
xfrm6_policy.c | ||
xfrm6_protocol.c | ||
xfrm6_state.c | ||
xfrm6_tunnel.c |