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| author | Yang Yingliang <yangyingliang@huawei.com> | 2022-10-29 16:29:31 +0800 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2022-10-29 16:29:31 +0800 |
| commit | d81916910f7498fe7a768697e0101d488f9fe665 (patch) | |
| tree | f5e4acc79381de7867a57ae8b2e5fb3b414035ce /drivers/platform | |
| parent | fbe605ab157b174385b3f19ce33928d3548a9b09 (diff) | |
| download | linux-d81916910f7498fe7a768697e0101d488f9fe665.tar.gz | |
platform/loongarch: laptop: Fix possible UAF and simplify generic_acpi_laptop_init()
Currently the return value of 'sub_driver->init' is not checked. If
sparse_keymap_setup() called in the init function fails, 'generic_
inputdev' is freed, then it will lead a UAF when using it in generic_
acpi_laptop_init(). Fix it by checking the return value and setting
generic_inputdev to NULL after free, so as to avoid double free it.
The error code in generic_subdriver_init() is always negative, so the
return of generic_subdriver_init() can be simplified.
Fixes: 6246ed09111f ("LoongArch: Add ACPI-based generic laptop driver")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'drivers/platform')
| -rw-r--r-- | drivers/platform/loongarch/loongson-laptop.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/platform/loongarch/loongson-laptop.c b/drivers/platform/loongarch/loongson-laptop.c index 0e6f4efe21e5..99203584949d 100644 --- a/drivers/platform/loongarch/loongson-laptop.c +++ b/drivers/platform/loongarch/loongson-laptop.c @@ -448,6 +448,7 @@ static int __init event_init(struct generic_sub_driver *sub_driver) if (ret < 0) { pr_err("Failed to setup input device keymap\n"); input_free_device(generic_inputdev); + generic_inputdev = NULL; return ret; } @@ -502,8 +503,11 @@ static int __init generic_subdriver_init(struct generic_sub_driver *sub_driver) if (ret) return -EINVAL; - if (sub_driver->init) - sub_driver->init(sub_driver); + if (sub_driver->init) { + ret = sub_driver->init(sub_driver); + if (ret) + goto err_out; + } if (sub_driver->notify) { ret = setup_acpi_notify(sub_driver); @@ -519,7 +523,7 @@ static int __init generic_subdriver_init(struct generic_sub_driver *sub_driver) err_out: generic_subdriver_exit(sub_driver); - return (ret < 0) ? ret : 0; + return ret; } static void generic_subdriver_exit(struct generic_sub_driver *sub_driver) |