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Subject[PATCH AUTOSEL 4.14 36/57] gtp: avoid zero size hashtable
Date
From: Taehee Yoo <ap420073@gmail.com>

[ Upstream commit 6a902c0f31993ab02e1b6ea7085002b9c9083b6a ]

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: Sasha Levin <sashal@kernel.org>
---
drivers/net/gtp.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c
index 52628a9986b1..b2f5f7f3d6b4 100644
--- a/drivers/net/gtp.c
+++ b/drivers/net/gtp.c
@@ -664,10 +664,13 @@ static int gtp_newlink(struct net *src_net, struct net_device *dev,
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)
--
2.20.1
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