This is a note to let you know that I've just added the patch titled
mmc: wmt-sdmmc: fix return value check of mmc_add_host()
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mmc-wmt-sdmmc-fix-return-value-check-of-mmc_add_host.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit a4c8522619d00fddaa611b9aedca427ac7a3d987
Author: Yang Yingliang <yangyingliang@xxxxxxxxxx>
Date: Tue Nov 1 14:30:23 2022 +0800
mmc: wmt-sdmmc: fix return value check of mmc_add_host()
[ 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@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20221101063023.1664968-10-yangyingliang@xxxxxxxxxx
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/mmc/host/wmt-sdmmc.c b/drivers/mmc/host/wmt-sdmmc.c
index f8b169684693..a132bc822b5c 100644
--- a/drivers/mmc/host/wmt-sdmmc.c
+++ b/drivers/mmc/host/wmt-sdmmc.c
@@ -863,11 +863,15 @@ 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:
