improve validation - add header length

diff --git a/blobmsg.c b/blobmsg.c
index cc6b2f3cb93daebd3e954af7ee28386718923eba..bddf2c88d9b8a1ad57cb748e53e22cb4c9f21104 100644 (file)
--- a/blobmsg.c
+++ b/blobmsg.c
@@ -26,7 +26,7 @@ bool blobmsg_check_attr(const struct blob_attr *attr, bool name)
        if (!hdr->namelen && name)
                return false;
 
-       if (hdr->namelen > blob_len(attr))
+       if (hdr->namelen > blob_len(attr) - sizeof(struct blobmsg_hdr))
                return false;
 
        if (hdr->name[hdr->namelen] != 0)