From: Yang Yingliang yangyingliang@huawei.com
[ 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@huawei.com Link: https://lore.kernel.org/r/20221109133539.3275664-1-yangyingliang@huawei.com Signed-off-by: Ulf Hansson ulf.hansson@linaro.org Signed-off-by: Sasha Levin sashal@kernel.org --- 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 3765e2f4ad98..2c4eda83ca18 100644 --- a/drivers/mmc/host/mmci.c +++ b/drivers/mmc/host/mmci.c @@ -2254,7 +2254,9 @@ 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;