platform/x86: wmi: Do not mix pages and kmalloc

The probe handler_data was being allocated with __get_free_pages()
for no reason I could find. The error path was using kfree(). Since
other things are happily using kmalloc() in the probe path, switch to
kmalloc() entirely. This fixes the error path mismatch and will avoid
issues with CONFIG_HARDENED_USERCOPY_PAGESPAN=y.

Reported-by: Mihai Donțu <mihai.dontu@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: Mario Limonciello <Mario.limonciello@dell.com>
Cc: stable@vger.kernel.org
Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org>

diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c
index 8e3d0146ff8c30332184d7aa35f4cae748a0b4bf..04791ea5d97b69f9ed9fc30fb7de46cf2370acbe 100644 (file)
--- a/drivers/platform/x86/wmi.c
+++ b/drivers/platform/x86/wmi.c
@@ -895,7 +895,6 @@ static int wmi_dev_probe(struct device *dev)
        struct wmi_driver *wdriver =
                container_of(dev->driver, struct wmi_driver, driver);
        int ret = 0;
-       int count;
        char *buf;
 
        if (ACPI_FAILURE(wmi_method_enable(wblock, 1)))
@@ -917,9 +916,8 @@ static int wmi_dev_probe(struct device *dev)
                        goto probe_failure;
                }
 
-               count = get_order(wblock->req_buf_size);
-               wblock->handler_data = (void *)__get_free_pages(GFP_KERNEL,
-                                                               count);
+               wblock->handler_data = kmalloc(wblock->req_buf_size,
+                                              GFP_KERNEL);
                if (!wblock->handler_data) {
                        ret = -ENOMEM;
                        goto probe_failure;
@@ -964,8 +962,7 @@ static int wmi_dev_remove(struct device *dev)
        if (wdriver->filter_callback) {
                misc_deregister(&wblock->char_dev);
                kfree(wblock->char_dev.name);
-               free_pages((unsigned long)wblock->handler_data,
-                          get_order(wblock->req_buf_size));
+               kfree(wblock->handler_data);
        }
 
        if (wdriver->remove)