From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Fri, 17 Dec 2021 15:03:12 +0000 (+0300)
Subject: wilc1000: fix double free error in probe()
X-Git-Tag: v6.6.17~8491^2~134^2~15
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=4894edacfa93d7046bec4fc61fc402ac6a2ac9e8;p=platform%2Fkernel%2Flinux-rpi.git

wilc1000: fix double free error in probe()

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>
Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20211217150311.GC16611@kili
---

diff --git a/drivers/net/wireless/microchip/wilc1000/netdev.c b/drivers/net/wireless/microchip/wilc1000/netdev.c
index 03e3485..643bdda 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 26ebf66..ec595dbd 100644
--- a/drivers/net/wireless/microchip/wilc1000/sdio.c
+++ b/drivers/net/wireless/microchip/wilc1000/sdio.c
@@ -167,9 +167,11 @@ free:
 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 e0871b8..5ace9e3 100644
--- a/drivers/net/wireless/microchip/wilc1000/spi.c
+++ b/drivers/net/wireless/microchip/wilc1000/spi.c
@@ -190,9 +190,11 @@ free:
 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;
 }