netdev - [PATCH net-next] net: ethtool: avoid OOB accesses in PAUSE

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Message-ID: <20250626233926.199801-1-kuba@kernel.org>
Date: Thu, 26 Jun 2025 16:39:26 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org,
	edumazet@...gle.com,
	pabeni@...hat.com,
	andrew+netdev@...n.ch,
	horms@...nel.org,
	Jakub Kicinski <kuba@...nel.org>,
	syzbot+430f9f76633641a62217@...kaller.appspotmail.com,
	andrew@...n.ch,
	maxime.chevallier@...tlin.com
Subject: [PATCH net-next] net: ethtool: avoid OOB accesses in PAUSE_SET

We now reuse .parse_request() from GET on SET, so we need to make sure
that the policies for both cover the attributes used for .parse_request().
genetlink will only allocate space in info->attrs for ARRAY_SIZE(policy).

Reported-by: syzbot+430f9f76633641a62217@...kaller.appspotmail.com
Fixes: 963781bdfe20 ("net: ethtool: call .parse_request for SET handlers")
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
CC: andrew@...n.ch
CC: maxime.chevallier@...tlin.com
---
 net/ethtool/netlink.h | 2 +-
 net/ethtool/pause.c   | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/ethtool/netlink.h b/net/ethtool/netlink.h
index 373a8d5e86ae..94a7eb402022 100644
--- a/net/ethtool/netlink.h
+++ b/net/ethtool/netlink.h
@@ -467,7 +467,7 @@ extern const struct nla_policy ethnl_channels_set_policy[ETHTOOL_A_CHANNELS_COMB
 extern const struct nla_policy ethnl_coalesce_get_policy[ETHTOOL_A_COALESCE_HEADER + 1];
 extern const struct nla_policy ethnl_coalesce_set_policy[ETHTOOL_A_COALESCE_MAX + 1];
 extern const struct nla_policy ethnl_pause_get_policy[ETHTOOL_A_PAUSE_STATS_SRC + 1];
-extern const struct nla_policy ethnl_pause_set_policy[ETHTOOL_A_PAUSE_TX + 1];
+extern const struct nla_policy ethnl_pause_set_policy[ETHTOOL_A_PAUSE_STATS_SRC + 1];
 extern const struct nla_policy ethnl_eee_get_policy[ETHTOOL_A_EEE_HEADER + 1];
 extern const struct nla_policy ethnl_eee_set_policy[ETHTOOL_A_EEE_TX_LPI_TIMER + 1];
 extern const struct nla_policy ethnl_tsinfo_get_policy[ETHTOOL_A_TSINFO_MAX + 1];
diff --git a/net/ethtool/pause.c b/net/ethtool/pause.c
index f7c847aeb1a2..0f9af1e66548 100644
--- a/net/ethtool/pause.c
+++ b/net/ethtool/pause.c
@@ -168,6 +168,7 @@ const struct nla_policy ethnl_pause_set_policy[] = {
 	[ETHTOOL_A_PAUSE_AUTONEG]		= { .type = NLA_U8 },
 	[ETHTOOL_A_PAUSE_RX]			= { .type = NLA_U8 },
 	[ETHTOOL_A_PAUSE_TX]			= { .type = NLA_U8 },
+	[ETHTOOL_A_PAUSE_STATS_SRC]		= { .type = NLA_REJECT },
 };
 
 static int
-- 
2.50.0