4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: William Tu <u9012063@xxxxxxxxx>
commit 51fa960d3b5163b1af22efdebcabfccc5d615ad6 upstream.
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 <eric.dumazet@xxxxxxxxx>
Signed-off-by: William Tu <u9012063@xxxxxxxxx>
Reviewed-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/ipv4/ip_gre.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -1182,7 +1182,8 @@ static int erspan_validate(struct nlattr
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 */
