From: Dan Carpenter <dan.carpenter@oracle.com>
To: Ajay Singh <ajay.kathat@microchip.com>,
Claudiu Beznea <claudiu.beznea@microchip.com>
Cc: Kalle Valo <kvalo@kernel.org>,
linux-wireless@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: [PATCH] wilc1000: fix double free error in probe()
Date: Fri, 17 Dec 2021 18:03:12 +0300 [thread overview]
Message-ID: <20211217150311.GC16611@kili> (raw)
Smatch complains that there is a double free in probe:
drivers/net/wireless/microchip/wilc1000/spi.c:186 wilc_bus_probe() error: double free of 'spi_priv'
drivers/net/wireless/microchip/wilc1000/sdio.c:163 wilc_sdio_probe() error: double free of 'sdio_priv'
The problem is that wilc_netdev_cleanup() function frees "wilc->bus_data".
That's confusing and a layering violation. Leave the frees in probe(),
delete the free in wilc_netdev_cleanup(), and add some new frees to the
remove() functions.
Fixes: dc8b338f3bcd ("wilc1000: use goto labels on error path")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
drivers/net/wireless/microchip/wilc1000/netdev.c | 1 -
drivers/net/wireless/microchip/wilc1000/sdio.c | 2 ++
drivers/net/wireless/microchip/wilc1000/spi.c | 2 ++
3 files changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/net/wireless/microchip/wilc1000/netdev.c b/drivers/net/wireless/microchip/wilc1000/netdev.c
index 03e3485d7e7f..643bddaae32a 100644
--- a/drivers/net/wireless/microchip/wilc1000/netdev.c
+++ b/drivers/net/wireless/microchip/wilc1000/netdev.c
@@ -905,7 +905,6 @@ void wilc_netdev_cleanup(struct wilc *wilc)
wilc_wlan_cfg_deinit(wilc);
wlan_deinit_locks(wilc);
- kfree(wilc->bus_data);
wiphy_unregister(wilc->wiphy);
wiphy_free(wilc->wiphy);
}
diff --git a/drivers/net/wireless/microchip/wilc1000/sdio.c b/drivers/net/wireless/microchip/wilc1000/sdio.c
index 26ebf6664342..ec595dbd8959 100644
--- a/drivers/net/wireless/microchip/wilc1000/sdio.c
+++ b/drivers/net/wireless/microchip/wilc1000/sdio.c
@@ -167,9 +167,11 @@ static int wilc_sdio_probe(struct sdio_func *func,
static void wilc_sdio_remove(struct sdio_func *func)
{
struct wilc *wilc = sdio_get_drvdata(func);
+ struct wilc_sdio *sdio_priv = wilc->bus_data;
clk_disable_unprepare(wilc->rtc_clk);
wilc_netdev_cleanup(wilc);
+ kfree(sdio_priv);
}
static int wilc_sdio_reset(struct wilc *wilc)
diff --git a/drivers/net/wireless/microchip/wilc1000/spi.c b/drivers/net/wireless/microchip/wilc1000/spi.c
index e0871b89917d..5ace9e3a56fc 100644
--- a/drivers/net/wireless/microchip/wilc1000/spi.c
+++ b/drivers/net/wireless/microchip/wilc1000/spi.c
@@ -190,9 +190,11 @@ static int wilc_bus_probe(struct spi_device *spi)
static int wilc_bus_remove(struct spi_device *spi)
{
struct wilc *wilc = spi_get_drvdata(spi);
+ struct wilc_spi *spi_priv = wilc->bus_data;
clk_disable_unprepare(wilc->rtc_clk);
wilc_netdev_cleanup(wilc);
+ kfree(spi_priv);
return 0;
}
--
2.20.1
next reply other threads:[~2021-12-17 15:03 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-17 15:03 Dan Carpenter [this message]
2021-12-20 6:59 ` [PATCH] wilc1000: fix double free error in probe() Claudiu.Beznea
2021-12-20 18:44 ` Kalle Valo
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