From: Yang Yingliang yangyingliang@huawei.com
[ Upstream commit 29276d56f6ed138db0f38cd31aedc0b725c8c76c ]
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 goto error path which will call mmc_free_host(), besides, clk_disable_unprepare() also needs be called.
Fixes: 3a96dff0f828 ("mmc: SD/MMC Host Controller for Wondermedia WM8505/WM8650") Signed-off-by: Yang Yingliang yangyingliang@huawei.com Link: https://lore.kernel.org/r/20221101063023.1664968-10-yangyingliang@huawei.com Signed-off-by: Ulf Hansson ulf.hansson@linaro.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/mmc/host/wmt-sdmmc.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/host/wmt-sdmmc.c b/drivers/mmc/host/wmt-sdmmc.c index 9b5c503e3a3f..9aa3027ca25e 100644 --- a/drivers/mmc/host/wmt-sdmmc.c +++ b/drivers/mmc/host/wmt-sdmmc.c @@ -856,11 +856,15 @@ static int wmt_mci_probe(struct platform_device *pdev) /* configure the controller to a known 'ready' state */ wmt_reset_hardware(mmc);
- mmc_add_host(mmc); + ret = mmc_add_host(mmc); + if (ret) + goto fail7;
dev_info(&pdev->dev, "WMT SDHC Controller initialized\n");
return 0; +fail7: + clk_disable_unprepare(priv->clk_sdmmc); fail6: clk_put(priv->clk_sdmmc); fail5_and_a_half: