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mmc: rtsx_usb_sdmmc: fix return value check of mmc_add_host()

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[ Upstream commit fc38a5a10e ]

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: c7f6558d84 ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Yang Yingliang 2022-11-01 14:30:20 +08:00 committed by Greg Kroah-Hartman
parent b8bdb3fd13
commit 89303ddbb5
1 changed files with 10 additions and 1 deletions
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11
drivers/mmc/host/rtsx_usb_sdmmc.c
View file

@ -1344,6 +1344,7 @@ 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)
@ -1382,7 +1383,15 @@ 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;
}