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| author |   Pan Bian <bianpan2016@163.com> | 2019-04-17 16:28:37 +0800 |
|---|---|---|
| committer |   Ulf Hansson <ulf.hansson@linaro.org> | 2019-05-06 11:55:39 +0200 |
| commit | 8e1943af2986db42bee2b8dddf49a36cdb2e9219 (patch) | |
| tree | cfd89e84e236c807e1597e6670252c18a2ddd131 /drivers/mmc/core/host.c | |
| parent | mmc: core: Fix warning and undefined behavior in mmc voltage handling (diff) | |
| download | linux-dev-8e1943af2986db42bee2b8dddf49a36cdb2e9219.tar.xz linux-dev-8e1943af2986db42bee2b8dddf49a36cdb2e9219.zip | |
mmc: core: fix possible use after free of host
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: 1ed217194488 ("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>
Diffstat (limited to '')
| -rw-r--r-- | drivers/mmc/core/host.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c index b3fa9c916142..6a51f7a06ce7 100644 --- a/drivers/mmc/core/host.c +++ b/drivers/mmc/core/host.c @@ -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; } |