YueHaibing 8999dc8949 net/x25: Fix null-ptr-deref in x25_disconnect ... We should check null before do x25_neigh_put in x25_disconnect, otherwise may cause null-ptr-deref like this: #include <sys/socket.h> #include <linux/x25.h> int main() { int sck_x25; sck_x25 = socket(AF_X25, SOCK_SEQPACKET, 0); close(sck_x25); return 0; } BUG: kernel NULL pointer dereference, address: 00000000000000d8 CPU: 0 PID: 4817 Comm: t2 Not tainted 5.7.0-rc3+ #159 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.9.3- RIP: 0010:x25_disconnect+0x91/0xe0 Call Trace: x25_release+0x18a/0x1b0 __sock_release+0x3d/0xc0 sock_close+0x13/0x20 __fput+0x107/0x270 ____fput+0x9/0x10 task_work_run+0x6d/0xb0 exit_to_usermode_loop+0x102/0x110 do_syscall_64+0x23c/0x260 entry_SYSCALL_64_after_hwframe+0x49/0xb3 Reported-by: syzbot+6db548b615e5aeefdce2@syzkaller.appspotmail.com Fixes: 4becb7ee5b ("net/x25: Fix x25_neigh refcnt leak when x25 disconnect") Signed-off-by: YueHaibing <yuehaibing@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2020-04-28 14:08:59 -07:00
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6lowpan
9p
802
8021q
appletalk
atm
ax25
batman-adv
bluetooth
bpf
bpfilter
bridge
caif
can
ceph
core	net: remove obsolete comment	2020-04-25 20:49:32 -07:00
dcb
dccp
decnet
dns_resolver
dsa
ethernet
ethtool
hsr
ieee802154
ife
ipv4
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iucv
kcm
key
l2tp
l3mdev
lapb
llc
mac80211
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mpls
mptcp	mptcp: fix race in msk status update	2020-04-25 20:38:54 -07:00
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netlabel
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qrtr
rds
rfkill
rose
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sched	sch_sfq: validate silly quantum values	2020-04-27 11:49:57 -07:00
sctp
smc
strparser
sunrpc
switchdev
tipc
tls	net/tls: Fix sk_psock refcnt leak when in tls_data_ready()	2020-04-27 11:22:38 -07:00
unix
vmw_vsock	vsock/virtio: fix multiple packet delivery to monitoring devices	2020-04-27 10:18:01 -07:00
wimax
wireless
x25	net/x25: Fix null-ptr-deref in x25_disconnect	2020-04-28 14:08:59 -07:00
xdp
xfrm
compat.c
Kconfig
Makefile
socket.c
sysctl_net.c