[PATCH net] net: dsa: sja1105: Prevent leaking memory

[PATCH net] net: dsa: sja1105: Prevent leaking memory

[Vladimir Oltean]

From: Navid Emamdoost <navid.emamdoost@gmail.com>

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.

Fixes: 8aa9ebccae87 ("net: dsa: Introduce driver for NXP SJA1105 5-port L2 switch")
Fixes: 1a4c69406cc1 ("net: dsa: sja1105: Prevent PHY jabbering during switch reset")
Signed-off-by: Navid Emamdoost <navid.emamdoost@gmail.com>
Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
---
Changes since v3:

I took over the patch and fixed formatting.

 drivers/net/dsa/sja1105/sja1105_spi.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/dsa/sja1105/sja1105_spi.c b/drivers/net/dsa/sja1105/sja1105_spi.c
index 84dc603138cf..58dd37ecde17 100644
--- a/drivers/net/dsa/sja1105/sja1105_spi.c
+++ b/drivers/net/dsa/sja1105/sja1105_spi.c
@@ -409,7 +409,8 @@ 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;
+		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

Re: [PATCH net] net: dsa: sja1105: Prevent leaking memory

[David Miller]

From: Vladimir Oltean <olteanv@gmail.com>
Date: Sun, 29 Sep 2019 01:43:39 +0300

> From: Navid Emamdoost <navid.emamdoost@gmail.com>
> 
> 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.
> 
> Fixes: 8aa9ebccae87 ("net: dsa: Introduce driver for NXP SJA1105 5-port L2 switch")
> Fixes: 1a4c69406cc1 ("net: dsa: sja1105: Prevent PHY jabbering during switch reset")
> Signed-off-by: Navid Emamdoost <navid.emamdoost@gmail.com>
> Signed-off-by: Vladimir Oltean <olteanv@gmail.com>

Applied and queued up for -stable.