linux-kernel - [PATCH] net: phy: phylink: check the return value of phylink

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Message-Id: <20220225091246.22085-1-baijiaju1990@gmail.com>
Date:   Fri, 25 Feb 2022 01:12:46 -0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     linux@...linux.org.uk, andrew@...n.ch, hkallweit1@...il.com,
        davem@...emloft.net, kuba@...nel.org
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jia-Ju Bai <baijiaju1990@...il.com>
Subject: [PATCH] net: phy: phylink: check the return value of phylink_validate()

The function phylink_validate() can fail, so its return value should be
checked.

Fixes: 9525ae83959b ("phylink: add phylink infrastructure")
Reported-by: TOTE Robot <oslab@...nghua.edu.cn>
Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.com>
---
 drivers/net/phy/phylink.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index 420201858564..597f7579b29f 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -584,7 +584,9 @@ static int phylink_parse_fixedlink(struct phylink *pl,
 
 	bitmap_fill(pl->supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
 	linkmode_copy(pl->link_config.advertising, pl->supported);
-	phylink_validate(pl, pl->supported, &pl->link_config);
+	ret = phylink_validate(pl, pl->supported, &pl->link_config);
+	if (ret)
+		return ret;
 
 	s = phy_lookup_setting(pl->link_config.speed, pl->link_config.duplex,
 			       pl->supported, true);
@@ -1261,7 +1263,11 @@ struct phylink *phylink_create(struct phylink_config *config,
 
 	bitmap_fill(pl->supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
 	linkmode_copy(pl->link_config.advertising, pl->supported);
-	phylink_validate(pl, pl->supported, &pl->link_config);
+	ret = phylink_validate(pl, pl->supported, &pl->link_config);
+	if (ret < 0) {
+		kfree(pl);
+		return ERR_PTR(ret);
+	}
 
 	ret = phylink_parse_mode(pl, fwnode);
 	if (ret < 0) {
-- 
2.17.1