From: Yang Yingliang <yangyingliang@xxxxxxxxxx>
[ Upstream commit b38a20f29a49ae04d23750d104b25400b792b98c ]
mmc_add_host() may return error, if we ignore its return value,
it will lead two issues:
1. The memory that allocated in mmc_alloc_host() is leaked.
2. In the remove() path, mmc_remove_host() will be called to
delete device, but it's not added yet, it will lead a kernel
crash because of null-ptr-deref in device_del().
So fix this by checking the return value and goto error path which
will call mmc_free_host().
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Yang Yingliang <yangyingliang@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20221109133539.3275664-1-yangyingliang@xxxxxxxxxx
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/mmc/host/mmci.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index df990bb8c873..347dffaea105 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -1718,7 +1718,9 @@ static int mmci_probe(struct amba_device *dev,
pm_runtime_set_autosuspend_delay(&dev->dev, 50);
pm_runtime_use_autosuspend(&dev->dev);
- mmc_add_host(mmc);
+ ret = mmc_add_host(mmc);
+ if (ret)
+ goto clk_disable;
pm_runtime_put(&dev->dev);
return 0;
--
2.35.1
