HID: core: zero-initialize the report buffer

BugLink: https://bugs.launchpad.net/bugs/2089533

[ Upstream 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 <bsevens@google.com>
Acked-by: Benjamin Tissoires <bentiss@kernel.org>
Signed-off-by: Jiri Kosina <jkosina@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
CVE-2024-50302
Signed-off-by: Manuel Diewald <manuel.diewald@canonical.com>
Signed-off-by: Mehmet Basaran <mehmet.basaran@canonical.com>

Author: Jiri Kosina

drivers/hid/hid-core.c

@@ -1664,7 +1664,7 @@ 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);