[NETLINK]: Clear padding in netlink messages

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 1 deletions

diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
index d021888b58f1..dc26e82ba0fd 100644
--- a/include/linux/rtnetlink.h
+++ b/include/linux/rtnetlink.h
@@ -898,7 +898,9 @@ extern void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const voi
         memcpy(skb_put(skb, attrlen), data, attrlen); })
 
 #define RTA_PUT_NOHDR(skb, attrlen, data) \
-        RTA_APPEND(skb, RTA_ALIGN(attrlen), data)
+({      RTA_APPEND(skb, RTA_ALIGN(attrlen), data); \
+        memset(skb->tail - (RTA_ALIGN(attrlen) - attrlen), 0, \
+               RTA_ALIGN(attrlen) - attrlen); })
 
 #define RTA_PUT_U8(skb, attrtype, value) \
 ({      u8 _tmp = (value); \
@@ -978,6 +980,7 @@ __rta_reserve(struct sk_buff *skb, int attrtype, int attrlen)
         rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
         rta->rta_type = attrtype;
         rta->rta_len = size;
+        memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
         return rta;
 }