Perform range check on len in nlmsg_reserve

am: f83d9c1c67

Change-Id: Ie702166cfd63a452792704a608c82e8481b3c123

1 files changed, 3 insertions, 0 deletions

diff --git a/lib/msg.c b/lib/msg.c
index 9fe9d541..91b86cbd 100644
--- a/lib/msg.c
+++ b/lib/msg.c
@@ -518,6 +518,9 @@ void *nlmsg_reserve(struct nl_msg *n, size_t len, int pad)
 	size_t nlmsg_len = n->nm_nlh->nlmsg_len;
 	size_t tlen;
 
+	if (len > n->nm_size)
+		return NULL;
+
 	tlen = pad ? ((len + (pad - 1)) & ~(pad - 1)) : len;
 
 	if ((tlen + nlmsg_len) > n->nm_size)