linux-kernel - [PATCH] rpmsg: fix memory leak on channel

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Message-Id: <20180927213627.12752-1-colin.king@canonical.com>
Date:   Thu, 27 Sep 2018 22:36:27 +0100
From:   Colin King <colin.king@...onical.com>
To:     Ohad Ben-Cohen <ohad@...ery.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        linux-remoteproc@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] rpmsg: fix memory leak on channel

From: Colin Ian King <colin.king@...onical.com>

Currently a failed allocation of channel->name leads to an
immediate return without freeing channel. Fix this by setting
ret to -ENOMEM and jumping to an exit path that kfree's channel.

Detected by CoverityScan, CID#1473692 ("Resource Leak")

Fixes: 53e2822e56c7 ("rpmsg: Introduce Qualcomm SMD backend")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/rpmsg/qcom_smd.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/rpmsg/qcom_smd.c b/drivers/rpmsg/qcom_smd.c
index 0dae7c9f4a8f..4abbeea782fa 100644
--- a/drivers/rpmsg/qcom_smd.c
+++ b/drivers/rpmsg/qcom_smd.c
@@ -1122,8 +1122,10 @@ static struct qcom_smd_channel *qcom_smd_create_channel(struct qcom_smd_edge *ed
 
 	channel->edge = edge;
 	channel->name = kstrdup(name, GFP_KERNEL);
-	if (!channel->name)
-		return ERR_PTR(-ENOMEM);
+	if (!channel->name) {
+		ret = -ENOMEM;
+		goto free_channel;
+	}
 
 	spin_lock_init(&channel->tx_lock);
 	spin_lock_init(&channel->recv_lock);
@@ -1173,6 +1175,7 @@ static struct qcom_smd_channel *qcom_smd_create_channel(struct qcom_smd_edge *ed
 
 free_name_and_channel:
 	kfree(channel->name);
+free_channel:
 	kfree(channel);
 
 	return ERR_PTR(ret);
-- 
2.17.1