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From:   Dmitry Antipov <dmantipov@yandex.ru>
To:     Kalle Valo <kvalo@kernel.org>
Cc:     Brian Norris <briannorris@chromium.org>,
        linux-wireless@vger.kernel.org, lvc-project@linuxtesting.org,
        Dmitry Antipov <dmantipov@yandex.ru>
Subject: [PATCH 1/5] wifi: mwifiex: fix memory leak in mwifiex_histogram_read()
Date:   Wed, 26 Jul 2023 10:20:52 +0300
Message-ID: <20230726072114.51964-1-dmantipov@yandex.ru>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Always free the zeroed page on return from 'mwifiex_histogram_read()'.

Fixes: cbf6e05527a7 ("mwifiex: add rx histogram statistics support")
Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
---
NOTE: this series supersedes all of the previous mwifiex patches not
yet accepted into wireless-next tree.
---
 drivers/net/wireless/marvell/mwifiex/debugfs.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/marvell/mwifiex/debugfs.c b/drivers/net/wireless/marvell/mwifiex/debugfs.c
index 52b18f4a774b..0cdd6c50c1c0 100644
--- a/drivers/net/wireless/marvell/mwifiex/debugfs.c
+++ b/drivers/net/wireless/marvell/mwifiex/debugfs.c
@@ -253,8 +253,11 @@ mwifiex_histogram_read(struct file *file, char __user *ubuf,
 	if (!p)
 		return -ENOMEM;
 
-	if (!priv || !priv->hist_data)
-		return -EFAULT;
+	if (!priv || !priv->hist_data) {
+		ret = -EFAULT;
+		goto free_and_exit;
+	}
+
 	phist_data = priv->hist_data;
 
 	p += sprintf(p, "\n"
@@ -309,6 +312,8 @@ mwifiex_histogram_read(struct file *file, char __user *ubuf,
 	ret = simple_read_from_buffer(ubuf, count, ppos, (char *)page,
 				      (unsigned long)p - page);
 
+free_and_exit:
+	free_page(page);
 	return ret;
 }
 
-- 
2.41.0