linux-kernel - [PATCH -next v2] MIPS: SGI-IP30: Fix platform-device leak in bridge_platform

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Message-ID: <20220920014002.249702-1-linyujun809@huawei.com>
Date:   Tue, 20 Sep 2022 09:40:02 +0800
From:   Lin Yujun <linyujun809@...wei.com>
To:     <tsbogend@...ha.franken.de>, <christophe.jaillet@...adoo.fr>,
        <paulburton@...nel.org>, <sfr@...b.auug.org.au>
CC:     <linux-mips@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH -next v2] MIPS: SGI-IP30: Fix platform-device leak in bridge_platform_create()

In error case in bridge_platform_create after calling
platform_device_add()/platform_device_add_data()/
platform_device_add_resources(), release the failed
'pdev' or it will be leak, call platform_device_put()
to fix this problem.

Besides, 'pdev' is divided into 'pdev_wd' and 'pdev_bd',
use platform_device_unregister() to release sgi_w1
resources when xtalk-bridge registration fails.

Fixes: fd27234f24ae ("MIPS: SGI-IP30: Free some unused memory")
Fixes: 7505576d1c1a ("MIPS: add support for SGI Octane (IP30)")
Signed-off-by: Lin Yujun <linyujun809@...wei.com>
---
 arch/mips/sgi-ip30/ip30-xtalk.c | 70 +++++++++++++++++++++++----------
 1 file changed, 50 insertions(+), 20 deletions(-)

diff --git a/arch/mips/sgi-ip30/ip30-xtalk.c b/arch/mips/sgi-ip30/ip30-xtalk.c
index 8129524421cb..7ceb2b23ea1c 100644
--- a/arch/mips/sgi-ip30/ip30-xtalk.c
+++ b/arch/mips/sgi-ip30/ip30-xtalk.c
@@ -40,12 +40,15 @@ static void bridge_platform_create(int widget, int masterwid)
 {
 	struct xtalk_bridge_platform_data *bd;
 	struct sgi_w1_platform_data *wd;
-	struct platform_device *pdev;
+	struct platform_device *pdev_wd;
+	struct platform_device *pdev_bd;
 	struct resource w1_res;
 
 	wd = kzalloc(sizeof(*wd), GFP_KERNEL);
-	if (!wd)
-		goto no_mem;
+	if (!wd) {
+		pr_warn("xtalk:%x bridge create out of memory\n", widget);
+		return;
+	}
 
 	snprintf(wd->dev_id, sizeof(wd->dev_id), "bridge-%012lx",
 		 IP30_SWIN_BASE(widget));
@@ -56,24 +59,35 @@ static void bridge_platform_create(int widget, int masterwid)
 	w1_res.end = w1_res.start + 3;
 	w1_res.flags = IORESOURCE_MEM;
 
-	pdev = platform_device_alloc("sgi_w1", PLATFORM_DEVID_AUTO);
-	if (!pdev) {
-		kfree(wd);
-		goto no_mem;
+	pdev_wd = platform_device_alloc("sgi_w1", PLATFORM_DEVID_AUTO);
+	if (!pdev_wd) {
+		pr_warn("xtalk:%x bridge create out of memory\n", widget);
+		goto err_kfree_wd;
+	}
+	if (platform_device_add_resources(pdev_wd, &w1_res, 1)) {
+		pr_warn("xtalk:%x bridge failed to add platform resources.\n", widget);
+		goto err_put_pdev_wd;
+	}
+	if (platform_device_add_data(pdev_wd, wd, sizeof(*wd))) {
+		pr_warn("xtalk:%x bridge failed to add platform data.\n", widget);
+		goto err_put_pdev_wd;
+	}
+	if (platform_device_add(pdev_wd)) {
+		pr_warn("xtalk:%x bridge failed to add platform device.\n", widget);
+		goto err_put_pdev_wd;
 	}
-	platform_device_add_resources(pdev, &w1_res, 1);
-	platform_device_add_data(pdev, wd, sizeof(*wd));
 	/* platform_device_add_data() duplicates the data */
 	kfree(wd);
-	platform_device_add(pdev);
 
 	bd = kzalloc(sizeof(*bd), GFP_KERNEL);
-	if (!bd)
-		goto no_mem;
-	pdev = platform_device_alloc("xtalk-bridge", PLATFORM_DEVID_AUTO);
-	if (!pdev) {
-		kfree(bd);
-		goto no_mem;
+	if (!bd) {
+		pr_warn("xtalk:%x bridge create out of memory\n", widget);
+		goto err_unregister_pdev_wd;
+	}
+	pdev_bd = platform_device_alloc("xtalk-bridge", PLATFORM_DEVID_AUTO);
+	if (!pdev_bd) {
+		pr_warn("xtalk:%x bridge create out of memory\n", widget);
+		goto err_kfree_bd;
 	}
 
 	bd->bridge_addr	= IP30_RAW_SWIN_BASE(widget);
@@ -93,15 +107,31 @@ static void bridge_platform_create(int widget, int masterwid)
 	bd->io.flags	= IORESOURCE_IO;
 	bd->io_offset	= IP30_SWIN_BASE(widget);
 
-	platform_device_add_data(pdev, bd, sizeof(*bd));
+	if (platform_device_add_data(pdev_bd, bd, sizeof(*bd))) {
+		pr_warn("xtalk:%x bridge failed to add platform data.\n", widget);
+		goto err_put_pdev_bd;
+	}
+	if (platform_device_add(pdev_bd)) {
+		pr_warn("xtalk:%x bridge failed to add platform device.\n", widget);
+		goto err_put_pdev_bd;
+	}
 	/* platform_device_add_data() duplicates the data */
 	kfree(bd);
-	platform_device_add(pdev);
 	pr_info("xtalk:%x bridge widget\n", widget);
 	return;
 
-no_mem:
-	pr_warn("xtalk:%x bridge create out of memory\n", widget);
+err_put_pdev_bd:
+	platform_device_put(pdev_bd);
+err_kfree_bd:
+	kfree(bd);
+err_unregister_pdev_wd:
+	platform_device_unregister(pdev_wd);
+	return;
+err_put_pdev_wd:
+	platform_device_put(pdev_wd);
+err_kfree_wd:
+	kfree(wd);
+	return;
 }
 
 static unsigned int __init xbow_widget_active(s8 wid)
-- 
2.17.1