From fc38a5a10e9e5a75eb9189854abeb8405b214cc9 Mon Sep 17 00:00:00 2001
From: Yang Yingliang <yangyingliang@huawei.com>
Date: Tue, 1 Nov 2022 14:30:20 +0800
Subject: [PATCH] mmc: rtsx_usb_sdmmc: fix return value check of mmc_add_host()
Git-commit: fc38a5a10e9e5a75eb9189854abeb8405b214cc9
Patch-mainline: v6.2-rc1
References: git-fixes
mmc_add_host() may return error, if we ignore its return value, the memory
that allocated in mmc_alloc_host() will be leaked and it will lead a kernel
crash because of deleting not added device in the remove path.
So fix this by checking the return value and calling mmc_free_host() in the
error path, besides, led_classdev_unregister() and pm_runtime_disable() also
need be called.
Fixes: c7f6558d84af ("mmc: Add realtek USB sdmmc host driver")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20221101063023.1664968-7-yangyingliang@huawei.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/mmc/host/rtsx_usb_sdmmc.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/host/rtsx_usb_sdmmc.c b/drivers/mmc/host/rtsx_usb_sdmmc.c
index 5798aee06653..2c650cd58693 100644
--- a/drivers/mmc/host/rtsx_usb_sdmmc.c
+++ b/drivers/mmc/host/rtsx_usb_sdmmc.c
@@ -1329,6 +1329,7 @@ static int rtsx_usb_sdmmc_drv_probe(struct platform_device *pdev)
#ifdef RTSX_USB_USE_LEDS_CLASS
int err;
#endif
+ int ret;
ucr = usb_get_intfdata(to_usb_interface(pdev->dev.parent));
if (!ucr)
@@ -1365,7 +1366,15 @@ static int rtsx_usb_sdmmc_drv_probe(struct platform_device *pdev)
INIT_WORK(&host->led_work, rtsx_usb_update_led);
#endif
- mmc_add_host(mmc);
+ ret = mmc_add_host(mmc);
+ if (ret) {
+#ifdef RTSX_USB_USE_LEDS_CLASS
+ led_classdev_unregister(&host->led);
+#endif
+ mmc_free_host(mmc);
+ pm_runtime_disable(&pdev->dev);
+ return ret;
+ }
return 0;
}
--
2.35.3