network: ignore multiple assignment of netdev kind

Fixes oss-fuzz#11279 and oss-fuzz#11280.

1 files changed, 35 insertions, 1 deletions

diff --git a/src/network/netdev/netdev.c b/src/network/netdev/netdev.c
index 9ec16579e4..f9a2246d08 100644
--- a/src/network/netdev/netdev.c
+++ b/src/network/netdev/netdev.c
@@ -97,7 +97,41 @@ static const char* const netdev_kind_table[_NETDEV_KIND_MAX] = {
 };
 
 DEFINE_STRING_TABLE_LOOKUP(netdev_kind, NetDevKind);
-DEFINE_CONFIG_PARSE_ENUM(config_parse_netdev_kind, netdev_kind, NetDevKind, "Failed to parse netdev kind");
+
+int config_parse_netdev_kind(
+                const char *unit,
+                const char *filename,
+                unsigned line,
+                const char *section,
+                unsigned section_line,
+                const char *lvalue,
+                int ltype,
+                const char *rvalue,
+                void *data,
+                void *userdata) {
+
+        NetDevKind k, *kind = data;
+
+        assert(rvalue);
+        assert(data);
+
+        k = netdev_kind_from_string(rvalue);
+        if (k < 0) {
+                log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse netdev kind, ignoring assignment: %s", rvalue);
+                return 0;
+        }
+
+        if (*kind != _NETDEV_KIND_INVALID && *kind != k) {
+                log_syntax(unit, LOG_ERR, filename, line, 0,
+                           "Specified netdev kind is different from the previous value '%s', ignoring assignment: %s",
+                           netdev_kind_to_string(*kind), rvalue);
+                return 0;
+        }
+
+        *kind = k;
+
+        return 0;
+}
 
 static void netdev_callbacks_clear(NetDev *netdev) {
         netdev_join_callback *callback;