linux-kernel - [PATCH 10/11] drm/amdgpu/discovery: fix possible memory leak

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Date:   Fri, 21 Oct 2022 10:21:01 +0800
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     <linux-kernel@...r.kernel.org>, <qemu-devel@...gnu.org>,
        <linux-f2fs-devel@...ts.sourceforge.net>,
        <linux-erofs@...ts.ozlabs.org>, <ocfs2-devel@....oracle.com>,
        <linux-mtd@...ts.infradead.org>, <amd-gfx@...ts.freedesktop.org>
CC:     <gregkh@...uxfoundation.org>, <rafael@...nel.org>, <somlo@....edu>,
        <mst@...hat.com>, <jaegeuk@...nel.org>, <chao@...nel.org>,
        <hsiangkao@...ux.alibaba.com>, <huangjianan@...o.com>,
        <mark@...heh.com>, <jlbec@...lplan.org>,
        <joseph.qi@...ux.alibaba.com>, <akpm@...ux-foundation.org>,
        <alexander.deucher@....com>, <luben.tuikov@....com>,
        <richard@....at>, <liushixin2@...wei.com>
Subject: [PATCH 10/11] drm/amdgpu/discovery: fix possible memory leak

If kset_register() fails, the refcount of kobject is not 0,
the name allocated in kobject_set_name(&kset.kobj, ...) is
leaked. Fix this by calling kset_put(), so that it will be
freed in callback function kobject_cleanup().

Cc: stable@...r.kernel.org
Fixes: a6c40b178092 ("drm/amdgpu: Show IP discovery in sysfs")
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
Reviewed-by: Luben Tuikov <luben.tuikov@....com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c
index 3993e6134914..638edcf70227 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c
@@ -863,7 +863,7 @@ static int amdgpu_discovery_sysfs_ips(struct amdgpu_device *adev,
 				res = kset_register(&ip_hw_id->hw_id_kset);
 				if (res) {
 					DRM_ERROR("Couldn't register ip_hw_id kset");
-					kfree(ip_hw_id);
+					kset_put(&ip_hw_id->hw_id_kset);
 					return res;
 				}
 				if (hw_id_names[ii]) {
@@ -954,7 +954,7 @@ static int amdgpu_discovery_sysfs_recurse(struct amdgpu_device *adev)
 		res = kset_register(&ip_die_entry->ip_kset);
 		if (res) {
 			DRM_ERROR("Couldn't register ip_die_entry kset");
-			kfree(ip_die_entry);
+			kset_put(&ip_die_entry->ip_kset);
 			return res;
 		}
 
@@ -989,6 +989,7 @@ static int amdgpu_discovery_sysfs_init(struct amdgpu_device *adev)
 	res = kset_register(&adev->ip_top->die_kset);
 	if (res) {
 		DRM_ERROR("Couldn't register die_kset");
+		kset_put(&adev->ip_top->die_kset);
 		goto Err;
 	}
 
-- 
2.25.1