From 51fa960d3b5163b1af22efdebcabfccc5d615ad6 Mon Sep 17 00:00:00 2001 From: William Tu Date: Tue, 12 May 2020 10:36:23 -0700 Subject: [PATCH] erspan: Check IFLA_GRE_ERSPAN_VER is set. Add a check to make sure the IFLA_GRE_ERSPAN_VER is provided by users. Fixes: f989d546a2d5 ("erspan: Add type I version 0 support.") Cc: Eric Dumazet Signed-off-by: William Tu Reviewed-by: Eric Dumazet Signed-off-by: David S. Miller --- net/ipv4/ip_gre.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c index e29cd48674d7..0ce9b91ff55c 100644 --- a/net/ipv4/ip_gre.c +++ b/net/ipv4/ip_gre.c @@ -1087,7 +1087,8 @@ static int erspan_validate(struct nlattr *tb[], struct nlattr *data[], if (ret) return ret; - if (nla_get_u8(data[IFLA_GRE_ERSPAN_VER]) == 0) + if (data[IFLA_GRE_ERSPAN_VER] && + nla_get_u8(data[IFLA_GRE_ERSPAN_VER]) == 0) return 0; /* ERSPAN type II/III should only have GRE sequence and key flag */ -- 2.30.2