linux-kernel - [PATCH] net: dsa: sja1105: prevent leaking memory

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Message-Id: <20190918171020.5745-1-navid.emamdoost@gmail.com>
Date:   Wed, 18 Sep 2019 12:10:19 -0500
From:   Navid Emamdoost <navid.emamdoost@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     emamd001@....edu, smccaman@....edu, kjlu@....edu,
        Navid Emamdoost <navid.emamdoost@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH] net: dsa: sja1105: prevent leaking memory

In sja1105_static_config_upload, in two cases memory is leaked: when
static_config_buf_prepare_for_upload fails and when sja1105_inhibit_tx
fails. In both cases config_buf should be released.

Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
---
 drivers/net/dsa/sja1105/sja1105_spi.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/net/dsa/sja1105/sja1105_spi.c b/drivers/net/dsa/sja1105/sja1105_spi.c
index 84dc603138cf..80e86c714efb 100644
--- a/drivers/net/dsa/sja1105/sja1105_spi.c
+++ b/drivers/net/dsa/sja1105/sja1105_spi.c
@@ -408,8 +408,9 @@ int sja1105_static_config_upload(struct sja1105_private *priv)
 
 	rc = static_config_buf_prepare_for_upload(priv, config_buf, buf_len);
 	if (rc < 0) {
-		dev_err(dev, "Invalid config, cannot upload\n");
-		return -EINVAL;
+		dev_err(dev, "Invalid config, cannot upload\n");
+		rc = -EINVAL;
+		goto out;
 	}
 	/* Prevent PHY jabbering during switch reset by inhibiting
 	 * Tx on all ports and waiting for current packet to drain.
@@ -418,7 +419,8 @@ int sja1105_static_config_upload(struct sja1105_private *priv)
 	rc = sja1105_inhibit_tx(priv, port_bitmap, true);
 	if (rc < 0) {
 		dev_err(dev, "Failed to inhibit Tx on ports\n");
-		return -ENXIO;
+		rc = -ENXIO;
+		goto out;
 	}
 	/* Wait for an eventual egress packet to finish transmission
 	 * (reach IFG). It is guaranteed that a second one will not
-- 
2.17.1