This is a note to let you know that I've just added the patch titled mmc: meson-gx: 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-meson-gx-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 0269fc7b1c27e849984e6b201914293a8d3c2acc Author: Yang Yingliang <yangyingliang@xxxxxxxxxx> Date: Tue Nov 8 20:34:17 2022 +0800 mmc: meson-gx: fix return value check of mmc_add_host() [ Upstream commit 90935f16f2650ab7416fa2ffbe5c28cb39cf3f1e ] 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: 51c5d8447bd7 ("MMC: meson: initial support for GX platforms") Signed-off-by: Yang Yingliang <yangyingliang@xxxxxxxxxx> Reviewed-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx> Link: https://lore.kernel.org/r/20221108123417.479045-1-yangyingliang@xxxxxxxxxx Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c index 72f34a58928c..dba98c2886f2 100644 --- a/drivers/mmc/host/meson-gx-mmc.c +++ b/drivers/mmc/host/meson-gx-mmc.c @@ -1370,7 +1370,9 @@ 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;