HID: core: zero-initialize the report buffer

Since the report buffer is used by all kinds of drivers in various ways, let's
zero-initialize it during allocation to make sure that it can't be ever used
to leak kernel memory via specially-crafted report.

Fixes: 27ce405 ("HID: fix data access in implement()")
Reported-by: Benoît Sevens <[email protected]>
Acked-by: Benjamin Tissoires <[email protected]>
Signed-off-by: Jiri Kosina <[email protected]>

Author: Jiri Kosina

drivers/hid/hid-core.c

@@ -1875,7 +1875,7 @@ u8 *hid_alloc_report_buf(struct hid_report *report, gfp_t flags)
 
 	u32 len = hid_report_len(report) + 7;
 
-	return kmalloc(len, flags);
+	return kzalloc(len, flags);
 }
 EXPORT_SYMBOL_GPL(hid_alloc_report_buf);