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mmc: meson-gx: fix return value check of mmc_add_host()

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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: 51c5d8447b ("MMC: meson: initial support for GX platforms")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20221108123417.479045-1-yangyingliang@huawei.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Yang Yingliang 2022-11-08 20:34:17 +08:00 committed by Ulf Hansson
parent a525cad241
commit 90935f16f2
1 changed files with 3 additions and 1 deletions
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4
drivers/mmc/host/meson-gx-mmc.c
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@ -1335,7 +1335,9 @@ static int meson_mmc_probe(struct platform_device *pdev)
}
mmc->ops = &meson_mmc_ops;
mmc_add_host(mmc);
ret = mmc_add_host(mmc);
if (ret)
goto err_free_irq;
return 0;