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 <[email protected]>
Signed-off-by: William Tu <[email protected]>
---
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 */
--
2.7.4
