linux-kernel - [PATCH 4.19 548/639] rtlwifi: Fix file release memory leak

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Date:   Fri, 24 Jan 2020 10:31:58 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Wei Yongjun <weiyongjun1@...wei.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 548/639] rtlwifi: Fix file release memory leak

From: Wei Yongjun <weiyongjun1@...wei.com>

[ Upstream commit 4c3e48794dec7cb568974ba3bf2ab62b9c45ca3e ]

When using single_open() for opening, single_release() should be
used instead of seq_release(), otherwise there is a memory leak.

This is detected by Coccinelle semantic patch.

Fixes: 610247f46feb ("rtlwifi: Improve debugging by using debugfs")
Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/realtek/rtlwifi/debug.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/realtek/rtlwifi/debug.c b/drivers/net/wireless/realtek/rtlwifi/debug.c
index d70385be99762..498994041bbcb 100644
--- a/drivers/net/wireless/realtek/rtlwifi/debug.c
+++ b/drivers/net/wireless/realtek/rtlwifi/debug.c
@@ -109,7 +109,7 @@ static const struct file_operations file_ops_common = {
 	.open = dl_debug_open_common,
 	.read = seq_read,
 	.llseek = seq_lseek,
-	.release = seq_release,
+	.release = single_release,
 };
 
 static int rtl_debug_get_mac_page(struct seq_file *m, void *v)
-- 
2.20.1