From: Matthias Schiffer Date: Tue, 27 Jun 2017 12:42:43 +0000 (+0200) Subject: vxlan: fix incorrect nlattr access in MTU check X-Git-Tag: v4.13-rc1~157^2~82 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=019b13ae85260cfab9d7ccb6ca58f094d18a24fd;p=karo-tx-linux.git vxlan: fix incorrect nlattr access in MTU check The access to the wrong variable could lead to a NULL dereference and possibly other invalid memory reads in vxlan newlink/changelink requests with a IFLA_MTU attribute. Fixes: a985343ba906 "vxlan: refactor verification and application of configuration" Signed-off-by: Matthias Schiffer Signed-off-by: David S. Miller --- diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c index 0dafd8e6c665..fd0ff97e3d81 100644 --- a/drivers/net/vxlan.c +++ b/drivers/net/vxlan.c @@ -2727,7 +2727,7 @@ static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[], } if (tb[IFLA_MTU]) { - u32 mtu = nla_get_u32(data[IFLA_MTU]); + u32 mtu = nla_get_u32(tb[IFLA_MTU]); if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU) return -EINVAL;