[PATCH v2] platform/x86/amd/pmf: Fix memory leak in amd_pmf_get_pb_data()

From: Cong Liu <liucong2@kylinos.cn>
To: shyam-sundar.s-k@amd.com,
	"Shyam Sundar S K" <Shyam-sundar.S-k@amd.com>,
	"Hans de Goede" <hdegoede@redhat.com>,
	"Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>,
	"Mario Limonciello" <mario.limonciello@amd.com>
Cc: linux-kernel@vger.kernel.org, liucong2@kylinos.cn,
	platform-driver-x86@vger.kernel.org
Subject: [PATCH v2] platform/x86/amd/pmf: Fix memory leak in amd_pmf_get_pb_data()
Date: Wed, 24 Jan 2024 09:29:38 +0800	[thread overview]
Message-ID: <20240124012939.6550-1-liucong2@kylinos.cn> (raw)
In-Reply-To: <b7bd8769-5f97-4c9a-be80-8d1acac92b19@amd.com>

amd_pmf_get_pb_data() will allocate memory for the policy buffer,
but does not free it if copy_from_user() fails. This leads to a memory
leak.

Fixes: 10817f28e533 ("platform/x86/amd/pmf: Add capability to sideload of policy binary")
Reviewed-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
Signed-off-by: Cong Liu <liucong2@kylinos.cn>
---
 drivers/platform/x86/amd/pmf/tee-if.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/amd/pmf/tee-if.c b/drivers/platform/x86/amd/pmf/tee-if.c
index 502ce93d5cdd..f8c0177afb0d 100644
--- a/drivers/platform/x86/amd/pmf/tee-if.c
+++ b/drivers/platform/x86/amd/pmf/tee-if.c
@@ -298,8 +298,10 @@ static ssize_t amd_pmf_get_pb_data(struct file *filp, const char __user *buf,
 	if (!new_policy_buf)
 		return -ENOMEM;
 
-	if (copy_from_user(new_policy_buf, buf, length))
+	if (copy_from_user(new_policy_buf, buf, length)) {
+		kfree(new_policy_buf);
 		return -EFAULT;
+	}
 
 	kfree(dev->policy_buf);
 	dev->policy_buf = new_policy_buf;
-- 
2.34.1

