netlink uses empty data to seperate different levels. However, we still
try to copy that data from a NULL ptr using memcpy, which is an undefined
behaviour.
Signed-off-by: Sasha Levin <sasha.le...@oracle.com>
---
lib/nlattr.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/lib/nlattr.c b/lib/nlattr.c
index 9c3e85f..6512b43 100644
--- a/lib/nlattr.c
+++ b/lib/nlattr.c
@@ -430,7 +430,8 @@ void __nla_put(struct sk_buff *skb, int attrtype, int
attrlen,
struct nlattr *nla;
nla = __nla_reserve(skb, attrtype, attrlen);
- memcpy(nla_data(nla), data, attrlen);
+ if (data)
+ memcpy(nla_data(nla), data, attrlen);
}
EXPORT_SYMBOL(__nla_put);
--
1.7.10.4
--
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