Perform range check on len in nlmsg_reserve

Bug: 32342065
Test: Compile
Change-Id: I2ef3d63f0910120721c1448eb7d4d64bcec71009
(cherry picked from commit 438fe14af8e839a9186ba30cddbe81ad2311ed00)

lib/msg.c

diff --git a/lib/msg.c b/lib/msg.c
index 9fe9d54..91b86cb 100644
--- a/lib/msg.c
+++ b/lib/msg.c
@@ -518,6 +518,9 @@
 	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)