[PATCH 3/9] dpp-util: fail on duplicate values in URI

The MAC and version elements weren't super critical but the channel
and bootstrapping key elements would result in memory leaks if there
were duplicates.

This patch now will not allow duplicate elements in the URI.
---
 src/dpp-util.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/dpp-util.c b/src/dpp-util.c
index cfdedbdd..1986a5cc 100644
--- a/src/dpp-util.c
+++ b/src/dpp-util.c
@@ -1166,21 +1166,34 @@ struct dpp_uri_info *dpp_parse_uri(const char *uri)
 
 		switch (*pos) {
 		case 'C':
+			if (L_WARN_ON(info->freqs))
+				goto free_info;
+
 			info->freqs = dpp_parse_class_and_channel(pos + 2, len);
 			if (!info->freqs)
 				goto free_info;
 			break;
 		case 'M':
+			if (L_WARN_ON(!l_memeqzero(info->mac,
+							sizeof(info->mac))))
+				goto free_info;
+
 			ret = dpp_parse_mac(pos + 2, len, info->mac);
 			if (ret < 0)
 				goto free_info;
 			break;
 		case 'V':
+			if (L_WARN_ON(info->version != 0))
+				goto free_info;
+
 			ret = dpp_parse_version(pos + 2, len, &info->version);
 			if (ret < 0)
 				goto free_info;
 			break;
 		case 'K':
+			if (L_WARN_ON(info->boot_public))
+				goto free_info;
+
 			info->boot_public = dpp_parse_key(pos + 2, len);
 			if (!info->boot_public)
 				goto free_info;
-- 
2.34.1