[PATCH 4.19 173/175] erspan: Check IFLA_GRE_ERSPAN_VER is set.

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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 */






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