From: Yang Yingliang yangyingliang@huawei.com
[ Upstream commit e4e46fb61e3bb4628170810d3f2b996b709b90d9 ]
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().
Fix this by checking the return value and goto error path which will call mmc_free_host().
Fixes: f0bf7f61b840 ("mmc: Add new via-sdmmc host controller driver") Signed-off-by: Yang Yingliang yangyingliang@huawei.com Link: https://lore.kernel.org/r/20221108130949.1067699-1-yangyingliang@huawei.com Signed-off-by: Ulf Hansson ulf.hansson@linaro.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/mmc/host/via-sdmmc.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/host/via-sdmmc.c b/drivers/mmc/host/via-sdmmc.c index 4e5043657ee2..70905d9beb38 100644 --- a/drivers/mmc/host/via-sdmmc.c +++ b/drivers/mmc/host/via-sdmmc.c @@ -1168,7 +1168,9 @@ static int via_sd_probe(struct pci_dev *pcidev, pcidev->subsystem_device == 0x3891) sdhost->quirks = VIA_CRDR_QUIRK_300MS_PWRDELAY;
- mmc_add_host(mmc); + ret = mmc_add_host(mmc); + if (ret) + goto unmap;
return 0;