linux-hardening - [PATCH v3 06/15] pinctrl: imx: don't access the pin function radix tree directly

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20250724-pinctrl-gpio-pinfuncs-v3-6-af4db9302de4@linaro.org>
Date: Thu, 24 Jul 2025 11:24:34 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Linus Walleij <linus.walleij@...aro.org>, 
 Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>, 
 Alexey Klimov <alexey.klimov@...aro.org>, 
 Lorenzo Bianconi <lorenzo@...nel.org>, Sean Wang <sean.wang@...nel.org>, 
 Matthias Brugger <matthias.bgg@...il.com>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
 Paul Cercueil <paul@...pouillou.net>, Kees Cook <kees@...nel.org>, 
 Andy Shevchenko <andy@...nel.org>, 
 Andrew Morton <akpm@...ux-foundation.org>, 
 David Hildenbrand <david@...hat.com>, 
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, 
 "Liam R. Howlett" <Liam.Howlett@...cle.com>, 
 Vlastimil Babka <vbabka@...e.cz>, Mike Rapoport <rppt@...nel.org>, 
 Suren Baghdasaryan <surenb@...gle.com>, Michal Hocko <mhocko@...e.com>, 
 Dong Aisheng <aisheng.dong@....com>, Fabio Estevam <festevam@...il.com>, 
 Shawn Guo <shawnguo@...nel.org>, Jacky Bai <ping.bai@....com>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 NXP S32 Linux Team <s32@....com>, Sascha Hauer <s.hauer@...gutronix.de>, 
 Tony Lindgren <tony@...mide.com>, 
 Haojian Zhuang <haojian.zhuang@...aro.org>, 
 Geert Uytterhoeven <geert+renesas@...der.be>
Cc: linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-arm-msm@...r.kernel.org, linux-mediatek@...ts.infradead.org, 
 linux-arm-kernel@...ts.infradead.org, linux-mips@...r.kernel.org, 
 linux-hardening@...r.kernel.org, linux-mm@...ck.org, imx@...ts.linux.dev, 
 linux-omap@...r.kernel.org, linux-renesas-soc@...r.kernel.org, 
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH v3 06/15] pinctrl: imx: don't access the pin function radix
 tree directly

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

The radix tree containing pin function descriptors should not be
accessed directly by drivers. There are dedicated functions for it. I
suppose this driver does it so that the memory containing the function
description is not duplicated but we're going to address that shortly so
convert it to using generic pinctrl APIs.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 drivers/pinctrl/freescale/pinctrl-imx.c | 38 +++++++++++----------------------
 1 file changed, 13 insertions(+), 25 deletions(-)

diff --git a/drivers/pinctrl/freescale/pinctrl-imx.c b/drivers/pinctrl/freescale/pinctrl-imx.c
index 18de31328540458b7f7e8e2e539a39d61829deb9..d5d42c9ad5fe9dcf7c25ad393688e714b02db678 100644
--- a/drivers/pinctrl/freescale/pinctrl-imx.c
+++ b/drivers/pinctrl/freescale/pinctrl-imx.c
@@ -580,33 +580,34 @@ static int imx_pinctrl_parse_functions(struct device_node *np,
 				       u32 index)
 {
 	struct pinctrl_dev *pctl = ipctl->pctl;
-	struct function_desc *func;
+	struct pinfunction *func;
 	struct group_desc *grp;
 	const char **group_names;
+	int ret;
 	u32 i;

 	dev_dbg(pctl->dev, "parse function(%d): %pOFn\n", index, np);

-	func = pinmux_generic_get_function(pctl, index);
+	func = devm_kzalloc(ipctl->dev, sizeof(*func), GFP_KERNEL);
 	if (!func)
-		return -EINVAL;
+		return -ENOMEM;

 	/* Initialise function */
-	func->func.name = np->name;
-	func->func.ngroups = of_get_child_count(np);
-	if (func->func.ngroups == 0) {
+	func->name = np->name;
+	func->ngroups = of_get_child_count(np);
+	if (func->ngroups == 0) {
 		dev_info(ipctl->dev, "no groups defined in %pOF\n", np);
 		return -EINVAL;
 	}

-	group_names = devm_kcalloc(ipctl->dev, func->func.ngroups,
-				   sizeof(*func->func.groups), GFP_KERNEL);
+	group_names = devm_kcalloc(ipctl->dev, func->ngroups,
+				   sizeof(*func->groups), GFP_KERNEL);
 	if (!group_names)
 		return -ENOMEM;
 	i = 0;
 	for_each_child_of_node_scoped(np, child)
 		group_names[i++] = child->name;
-	func->func.groups = group_names;
+	func->groups = group_names;

 	i = 0;
 	for_each_child_of_node_scoped(np, child) {
@@ -614,10 +615,9 @@ static int imx_pinctrl_parse_functions(struct device_node *np,
 		if (!grp)
 			return -ENOMEM;

-		mutex_lock(&ipctl->mutex);
-		radix_tree_insert(&pctl->pin_group_tree,
-				  ipctl->group_index++, grp);
-		mutex_unlock(&ipctl->mutex);
+		ret = pinmux_generic_add_pinfunction(pctl, func, NULL);
+		if (ret < 0)
+			return ret;

 		imx_pinctrl_parse_groups(child, grp, ipctl, i++);
 	}
@@ -669,18 +669,6 @@ static int imx_pinctrl_probe_dt(struct platform_device *pdev,
 		}
 	}

-	for (i = 0; i < nfuncs; i++) {
-		struct function_desc *function;
-
-		function = devm_kzalloc(&pdev->dev, sizeof(*function),
-					GFP_KERNEL);
-		if (!function)
-			return -ENOMEM;
-
-		mutex_lock(&ipctl->mutex);
-		radix_tree_insert(&pctl->pin_function_tree, i, function);
-		mutex_unlock(&ipctl->mutex);
-	}
 	pctl->num_functions = nfuncs;

 	ipctl->group_index = 0;

-- 
2.48.1