linux-kernel - [PATCH] knav_qmss_queue: fix a missing-check bug in knav_pool

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Date:   Thu, 30 May 2019 11:39:49 +0800
From:   Gen Zhang <blackgod016574@...il.com>
To:     ssantosh@...nel.org
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [PATCH] knav_qmss_queue: fix a missing-check bug in
 knav_pool_create()

In knav_pool_create(), 'pool->name' is allocated by kstrndup(). It
returns NULL when fails. So 'pool->name' should be checked. And free
'pool' when error.

Signed-off-by: Gen Zhang <blackgod016574@...il.com>
---
diff --git a/drivers/soc/ti/knav_qmss_queue.c b/drivers/soc/ti/knav_qmss_queue.c
index 8b41837..0f8cb28 100644
--- a/drivers/soc/ti/knav_qmss_queue.c
+++ b/drivers/soc/ti/knav_qmss_queue.c
@@ -814,6 +814,12 @@ void *knav_pool_create(const char *name,
 	}
 
 	pool->name = kstrndup(name, KNAV_NAME_SIZE - 1, GFP_KERNEL);
+	if (!pool->name) {
+		dev_err(kdev->dev, "failed to duplicate for pool(%s)\n",
+			name);
+		ret = -ENOMEM;
+		goto err_name;
+	}
 	pool->kdev = kdev;
 	pool->dev = kdev->dev;
 
@@ -864,6 +870,7 @@ void *knav_pool_create(const char *name,
 	mutex_unlock(&knav_dev_lock);
 err:
 	kfree(pool->name);
+err_name:
 	devm_kfree(kdev->dev, pool);
 	return ERR_PTR(ret);
 }