mmc: mmci: fix return value check of mmc_add_host()
authorYang Yingliang <yangyingliang@huawei.com>
Wed, 9 Nov 2022 13:35:39 +0000 (21:35 +0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sat, 31 Dec 2022 12:32:24 +0000 (13:32 +0100)
commiteb8431dc4b5a8f104f5414ce80d8df4f21bdffbd
treef7a0b5e5ce818e6085e647a6bdd58e3a4461c1e4
parent3697d9af93bf600da5078eb3ed49eac7cc55e9d9
mmc: mmci: fix return value check of mmc_add_host()

[ 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