From: Taehee Yoo <ap420073@gmail.com>
Date: Wed, 11 Dec 2019 08:23:48 +0000
Subject: gtp: avoid zero size hashtable
Git-commit: 6a902c0f31993ab02e1b6ea7085002b9c9083b6a
Patch-mainline: 5.5-rc3
References: networking-stable-20_01_01
GTP default hashtable size is 1024 and userspace could set specific
hashtable size with IFLA_GTP_PDP_HASHSIZE. If hashtable size is set to 0
from userspace, hashtable will not work and panic will occur.
Fixes: 459aa660eb1d ("gtp: add initial driver for datapath of GPRS Tunneling Protocol (GTP-U)")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
drivers/net/gtp.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
--- a/drivers/net/gtp.c
+++ b/drivers/net/gtp.c
@@ -658,10 +658,13 @@ static int gtp_newlink(struct net *src_n
if (err < 0)
return err;
- if (!data[IFLA_GTP_PDP_HASHSIZE])
+ if (!data[IFLA_GTP_PDP_HASHSIZE]) {
hashsize = 1024;
- else
+ } else {
hashsize = nla_get_u32(data[IFLA_GTP_PDP_HASHSIZE]);
+ if (!hashsize)
+ hashsize = 1024;
+ }
err = gtp_hashtable_new(gtp, hashsize);
if (err < 0)