netdev - [PATCH net] rtnetlink: not allow dev gro_max_size to exceed GRO_MAX

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Date: Fri, 19 May 2023 13:16:08 -0400
From: Xin Long <lucien.xin@...il.com>
To: network dev <netdev@...r.kernel.org>
Cc: davem@...emloft.net,
	kuba@...nel.org,
	Eric Dumazet <edumazet@...gle.com>,
	Paolo Abeni <pabeni@...hat.com>,
	Alexander Duyck <alexanderduyck@...com>
Subject: [PATCH net] rtnetlink: not allow dev gro_max_size to exceed GRO_MAX_SIZE

In commit 0fe79f28bfaf ("net: allow gro_max_size to exceed 65536"),
it limited GRO_MAX_SIZE to (8 * 65535) to avoid overflows, but also
deleted the check of GRO_MAX_SIZE when setting the dev gro_max_size.

Currently, dev gro_max_size can be set up to U32_MAX (0xFFFFFFFF),
and GRO_MAX_SIZE is not even used anywhere.

This patch brings back the GRO_MAX_SIZE check when setting dev
gro_max_size/gro_ipv4_max_size by users.

Fixes: 0fe79f28bfaf ("net: allow gro_max_size to exceed 65536")
Reported-by: Xiumei Mu <xmu@...hat.com>
Signed-off-by: Xin Long <lucien.xin@...il.com>
---
 net/core/rtnetlink.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 653901a1bf75..59b24b184cb0 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -2886,6 +2886,11 @@ static int do_setlink(const struct sk_buff *skb,
 	if (tb[IFLA_GRO_MAX_SIZE]) {
 		u32 gro_max_size = nla_get_u32(tb[IFLA_GRO_MAX_SIZE]);
 
+		if (gro_max_size > GRO_MAX_SIZE) {
+			err = -EINVAL;
+			goto errout;
+		}
+
 		if (dev->gro_max_size ^ gro_max_size) {
 			netif_set_gro_max_size(dev, gro_max_size);
 			status |= DO_SETLINK_MODIFIED;
@@ -2909,6 +2914,11 @@ static int do_setlink(const struct sk_buff *skb,
 	if (tb[IFLA_GRO_IPV4_MAX_SIZE]) {
 		u32 gro_max_size = nla_get_u32(tb[IFLA_GRO_IPV4_MAX_SIZE]);
 
+		if (gro_max_size > GRO_MAX_SIZE) {
+			err = -EINVAL;
+			goto errout;
+		}
+
 		if (dev->gro_ipv4_max_size ^ gro_max_size) {
 			netif_set_gro_ipv4_max_size(dev, gro_max_size);
 			status |= DO_SETLINK_MODIFIED;
-- 
2.39.1