This is a note to let you know that I've just added the patch titled
mmc: via-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-via-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 cb151bf15f1ce5877819545fee23b6a3b1fdd6b6
Author: Yang Yingliang <yangyingliang@xxxxxxxxxx>
Date: Tue Nov 8 21:09:49 2022 +0800
mmc: via-sdmmc: fix return value check of mmc_add_host()
[ 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@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20221108130949.1067699-1-yangyingliang@xxxxxxxxxx
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/mmc/host/via-sdmmc.c b/drivers/mmc/host/via-sdmmc.c
index 1b66466d2ed4..b78e96b5289b 100644
--- a/drivers/mmc/host/via-sdmmc.c
+++ b/drivers/mmc/host/via-sdmmc.c
@@ -1166,7 +1166,9 @@ 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;
