From: Yang Yingliang yangyingliang@huawei.com
[ Upstream commit dc5b9b50fc9d1334407e316e6e29a5097ef833bd ]
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(), besides, other resources also need be released.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Yang Yingliang yangyingliang@huawei.com Link: https://lore.kernel.org/r/20221109133237.3273558-1-yangyingliang@huawei.com Signed-off-by: Ulf Hansson ulf.hansson@linaro.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/mmc/host/wbsd.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/host/wbsd.c b/drivers/mmc/host/wbsd.c index 546aaf8d1507..6e0f37f373e0 100644 --- a/drivers/mmc/host/wbsd.c +++ b/drivers/mmc/host/wbsd.c @@ -1716,7 +1716,17 @@ static int wbsd_init(struct device *dev, int base, int irq, int dma, */ wbsd_init_device(host);
- mmc_add_host(mmc); + ret = mmc_add_host(mmc); + if (ret) { + if (!pnp) + wbsd_chip_poweroff(host); + + wbsd_release_resources(host); + wbsd_free_mmc(dev); + + mmc_free_host(mmc); + return ret; + }
pr_info("%s: W83L51xD", mmc_hostname(mmc)); if (host->chip_id != 0)