linux-kernel - [PATCH] ptp: ocp: Add const to bp->attr

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Message-Id: <20250426061858.work.470-kees@kernel.org>
Date: Fri, 25 Apr 2025 23:18:59 -0700
From: Kees Cook <kees@...nel.org>
To: Jonathan Lemon <jonathan.lemon@...il.com>
Cc: Kees Cook <kees@...nel.org>,
	Vadim Fedorenko <vadim.fedorenko@...ux.dev>,
	Richard Cochran <richardcochran@...il.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: [PATCH] ptp: ocp: Add const to bp->attr_group allocation type

In preparation for making the kmalloc family of allocators type aware,
we need to make sure that the returned type from the allocation matches
the type of the variable being assigned. (Before, the allocator would
always return "void *", which can be implicitly cast to any pointer type.)

The assigned type is "const struct attribute_group **", but the returned
type, while technically matching, will be not const qualified. As there is
no general way to safely add const qualifiers, adjust the allocation type
to match the assignment.

Signed-off-by: Kees Cook <kees@...nel.org>
---
Cc: Jonathan Lemon <jonathan.lemon@...il.com>
Cc: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
Cc: Richard Cochran <richardcochran@...il.com>
Cc: Andrew Lunn <andrew+netdev@...n.ch>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Eric Dumazet <edumazet@...gle.com>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Paolo Abeni <pabeni@...hat.com>
Cc: <netdev@...r.kernel.org>
---
 drivers/ptp/ptp_ocp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/ptp/ptp_ocp.c b/drivers/ptp/ptp_ocp.c
index faf6e027f89a..ed5968a3ea5a 100644
--- a/drivers/ptp/ptp_ocp.c
+++ b/drivers/ptp/ptp_ocp.c
@@ -2372,7 +2372,7 @@ ptp_ocp_attr_group_add(struct ptp_ocp *bp,
 		if (attr_tbl[i].cap & bp->fw_cap)
 			count++;
 
-	bp->attr_group = kcalloc(count + 1, sizeof(struct attribute_group *),
+	bp->attr_group = kcalloc(count + 1, sizeof(*bp->attr_group),
 				 GFP_KERNEL);
 	if (!bp->attr_group)
 		return -ENOMEM;
-- 
2.34.1