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authorWilliam Tu <u9012063@gmail.com>2020-05-12 20:36:23 +0300
committerDavid S. Miller <davem@davemloft.net>2020-05-12 23:11:41 +0300
commit51fa960d3b5163b1af22efdebcabfccc5d615ad6 (patch)
treeaad286134e49b89acbfb032c3acb6af575dc1b03 /net
parent113cb8ffd858fd91ec50c27bf0da1d8ca4c01bb1 (diff)
downloadlinux-51fa960d3b5163b1af22efdebcabfccc5d615ad6.tar.xz
erspan: Check IFLA_GRE_ERSPAN_VER is set.
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@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>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/ip_gre.c3
1 files changed, 2 insertions, 1 deletions
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 */