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erspan: Check IFLA_GRE_ERSPAN_VER is set.

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

Fixes: f989d546a2 ("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>
This commit is contained in:
William Tu 2020-05-12 10:36:23 -07:00 committed by David S. Miller
parent 113cb8ffd8
commit 51fa960d3b
1 changed files with 2 additions and 1 deletions
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3
net/ipv4/ip_gre.c
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@ -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 */