Commit 51fa960d authored May 12, 2020 by William Tu Committed by David S. Miller May 12, 2020

erspan: Check IFLA_GRE_ERSPAN_VER is set.



Add a check to make sure the IFLA_GRE_ERSPAN_VER is provided by users.

Fixes: f989d546 ("erspan: Add type I version 0 support.")
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: William Tu <u9012063@gmail.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 113cb8ff

net/ipv4/ip_gre.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -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 */

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