From: Michael Tremer <michael.tremer@ipfire.org>
Date: Tue, 2 Jan 2018 17:17:57 +0000 (+0000)
Subject: Validate the prefix to be within range
X-Git-Tag: 0.9.0~133
X-Git-Url: http://git.ipfire.org/?p=people%2Fms%2Flibloc.git;a=commitdiff_plain;h=6183c0f2af55f1d2dade4d74cca0915aedce4a19

Validate the prefix to be within range

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
---

diff --git a/src/network.c b/src/network.c
index dc1775a..866b377 100644
--- a/src/network.c
+++ b/src/network.c
@@ -37,6 +37,18 @@ struct loc_network {
 	uint32_t asn;
 };
 
+static int valid_prefix(struct in6_addr* address, unsigned int prefix) {
+	// The prefix cannot be larger than 128 bits
+	if (prefix > 128)
+		return 1;
+
+	// And the prefix cannot be zero
+	if (prefix == 0)
+		return 1;
+
+	return 0;
+}
+
 LOC_EXPORT int loc_network_new(struct loc_ctx* ctx, struct loc_network** network,
 		struct in6_addr start_address, unsigned int prefix) {
 	// Address cannot be unspecified
@@ -63,6 +75,12 @@ LOC_EXPORT int loc_network_new(struct loc_ctx* ctx, struct loc_network** network
 		return -EINVAL;
 	}
 
+	// Validate the prefix
+	if (valid_prefix(&start_address, prefix) != 0) {
+		DEBUG(ctx, "Invalid prefix: %u\n", prefix);
+		return -EINVAL;
+	}
+
 	struct loc_network* n = calloc(1, sizeof(*n));
 	if (!n)
 		return -ENOMEM;