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2024-05-11 04dd17822334871b23ea2862f7798fb0e0007777

 kernel/net/ipv4/metrics.c
..
..
@@ -1,12 +1,15 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 #include <linux/netlink.h>
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+#include <linux/nospec.h>
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 #include <linux/rtnetlink.h>
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 #include <linux/types.h>
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 #include <net/ip.h>
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 #include <net/net_namespace.h>
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 #include <net/tcp.h>
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9
 
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-int ip_metrics_convert(struct net *net, struct nlattr *fc_mx, int fc_mx_len,
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-		       u32 *metrics)
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+static int ip_metrics_convert(struct net *net, struct nlattr *fc_mx,
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+			      int fc_mx_len, u32 *metrics,
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+			      struct netlink_ext_ack *extack)
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 {
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 	bool ecn_ca = false;
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 	struct nlattr *nla;
..
..
@@ -21,19 +24,27 @@
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 		if (!type)
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 			continue;
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-		if (type > RTAX_MAX)
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+		if (type > RTAX_MAX) {
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+			NL_SET_ERR_MSG(extack, "Invalid metric type");
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 			return -EINVAL;
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+		}
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+		type = array_index_nospec(type, RTAX_MAX + 1);
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 		if (type == RTAX_CC_ALGO) {
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 			char tmp[TCP_CA_NAME_MAX];
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 			nla_strlcpy(tmp, nla, sizeof(tmp));
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 			val = tcp_ca_get_key_by_name(net, tmp, &ecn_ca);
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-			if (val == TCP_CA_UNSPEC)
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+			if (val == TCP_CA_UNSPEC) {
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+				NL_SET_ERR_MSG(extack, "Unknown tcp congestion algorithm");
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 				return -EINVAL;
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+			}
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 		} else {
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-			if (nla_len(nla) != sizeof(u32))
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+			if (nla_len(nla) != sizeof(u32)) {
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+				NL_SET_ERR_MSG_ATTR(extack, nla,
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+						    "Invalid attribute in metrics");
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 				return -EINVAL;
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+			}
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 			val = nla_get_u32(nla);
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 		}
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 		if (type == RTAX_ADVMSS && val > 65535 - 40)
..
..
@@ -42,8 +53,10 @@
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 			val = 65535 - 15;
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 		if (type == RTAX_HOPLIMIT && val > 255)
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 			val = 255;
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-		if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
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+		if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK)) {
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+			NL_SET_ERR_MSG(extack, "Unknown flag set in feature mask in metrics attribute");
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 			return -EINVAL;
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+		}
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 		metrics[type - 1] = val;
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 	}
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..
..
@@ -52,4 +65,30 @@
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65
 
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 	return 0;
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 }
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-EXPORT_SYMBOL_GPL(ip_metrics_convert);
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+
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+struct dst_metrics *ip_fib_metrics_init(struct net *net, struct nlattr *fc_mx,
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+					int fc_mx_len,
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+					struct netlink_ext_ack *extack)
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+{
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+	struct dst_metrics *fib_metrics;
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+	int err;
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+
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+	if (!fc_mx)
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+		return (struct dst_metrics *)&dst_default_metrics;
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+
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+	fib_metrics = kzalloc(sizeof(*fib_metrics), GFP_KERNEL);
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+	if (unlikely(!fib_metrics))
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+		return ERR_PTR(-ENOMEM);
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+
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+	err = ip_metrics_convert(net, fc_mx, fc_mx_len, fib_metrics->metrics,
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+				 extack);
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+	if (!err) {
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+		refcount_set(&fib_metrics->refcnt, 1);
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+	} else {
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+		kfree(fib_metrics);
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+		fib_metrics = ERR_PTR(err);
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+	}
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+
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+	return fib_metrics;
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+}
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+EXPORT_SYMBOL_GPL(ip_fib_metrics_init);