HID: core: zero-initialize the report buffer

jira VULN-40845
cve CVE-2024-50302
commit-author Jiri Kosina <[email protected]>
commit 177f25d

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]>
(cherry picked from commit 177f25d)
	Signed-off-by: Brett Mastbergen <[email protected]>

Author: bmastbergen

drivers/hid/hid-core.c

@@ -1353,7 +1353,7 @@ 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);