[SRU][N][PATCH 1/1] HID: core: zero-initialize the report buffer

[Juerg Haefliger]

From: Jiri Kosina <jkosina at suse.com>

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: 27ce405039bf ("HID: fix data access in implement()")
Reported-by: Benoît Sevens <bsevens at google.com>
Acked-by: Benjamin Tissoires <bentiss at kernel.org>
Signed-off-by: Jiri Kosina <jkosina at suse.com>
(cherry picked from commit 177f25d1292c7e16e1199b39c85480f7f8815552)
CVE-2024-50302
Signed-off-by: Juerg Haefliger <juerg.haefliger at canonical.com>
---
 drivers/hid/hid-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 751a73ae7de7..5516edc456b9 100644
--- a/drivers/hid/hid-core.c
+++ b/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);
 
-- 
2.43.0