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mmc: core: fix possible use after free of host

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In the function mmc_alloc_host, the function put_device is called to
release allocated resources when mmc_gpio_alloc fails. Finally, the
function pointed by host->class_dev.class->dev_release (i.e.,
mmc_host_classdev_release) is used to release resources including the
host structure. However, after put_device, host is used and released
again. Resulting in a use-after-free bug.

Fixes: 1ed2171944 ("mmc: core: fix error path in mmc_host_alloc")
Signed-off-by: Pan Bian <bianpan2016@163.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Pan Bian 2019-04-17 16:28:37 +08:00 committed by Ulf Hansson
parent 42c38d4a1b
commit 8e1943af29
1 changed files with 0 additions and 2 deletions
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drivers/mmc/core/host.c
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@ -429,8 +429,6 @@ struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
if (mmc_gpio_alloc(host)) {
put_device(&host->class_dev);
ida_simple_remove(&mmc_host_ida, host->index);
kfree(host);
return NULL;
}