linux-kernel - [PATCH AUTOSEL 5.4 19/27] staging: rtl8723bs: fix a potential memory leak in rtw_init_cmd

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Message-Id: <20221013002501.1895204-19-sashal@kernel.org>
Date:   Wed, 12 Oct 2022 20:24:51 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Xiaoke Wang <xkernel.wang@...mail.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>, kushalkothari285@...il.com,
        namcaov@...il.com, remckee0@...il.com, jagathjog1996@...il.com,
        eng.alaamohamedsoliman.am@...il.com, linux-staging@...ts.linux.dev
Subject: [PATCH AUTOSEL 5.4 19/27] staging: rtl8723bs: fix a potential memory leak in rtw_init_cmd_priv()

From: Xiaoke Wang <xkernel.wang@...mail.com>

[ Upstream commit 708056fba733a73d926772ea4ce9a42d240345da ]

In rtw_init_cmd_priv(), if `pcmdpriv->rsp_allocated_buf` is allocated
in failure, then `pcmdpriv->cmd_allocated_buf` will be not properly
released. Besides, considering there are only two error paths and the
first one can directly return, so we do not need implicitly jump to the
`exit` tag to execute the error handler.

So this patch added `kfree(pcmdpriv->cmd_allocated_buf);` on the error
path to release the resource and simplified the return logic of
rtw_init_cmd_priv(). As there is no proper device to test with, no runtime
testing was performed.

Signed-off-by: Xiaoke Wang <xkernel.wang@...mail.com>
Link: https://lore.kernel.org/r/tencent_2B7931B79BA38E22205C5A09EFDF11E48805@qq.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/staging/rtl8723bs/core/rtw_cmd.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/drivers/staging/rtl8723bs/core/rtw_cmd.c b/drivers/staging/rtl8723bs/core/rtw_cmd.c
index 8d93c2f26890..a82114de21a7 100644
--- a/drivers/staging/rtl8723bs/core/rtw_cmd.c
+++ b/drivers/staging/rtl8723bs/core/rtw_cmd.c
@@ -165,8 +165,6 @@ No irqsave is necessary.
 
 int rtw_init_cmd_priv(struct	cmd_priv *pcmdpriv)
 {
-	int res = 0;
-
 	init_completion(&pcmdpriv->cmd_queue_comp);
 	init_completion(&pcmdpriv->terminate_cmdthread_comp);
 
@@ -178,18 +176,16 @@ int rtw_init_cmd_priv(struct	cmd_priv *pcmdpriv)
 
 	pcmdpriv->cmd_allocated_buf = rtw_zmalloc(MAX_CMDSZ + CMDBUFF_ALIGN_SZ);
 
-	if (!pcmdpriv->cmd_allocated_buf) {
-		res = -ENOMEM;
-		goto exit;
-	}
+	if (!pcmdpriv->cmd_allocated_buf)
+		return -ENOMEM;
 
 	pcmdpriv->cmd_buf = pcmdpriv->cmd_allocated_buf  +  CMDBUFF_ALIGN_SZ - ((SIZE_PTR)(pcmdpriv->cmd_allocated_buf) & (CMDBUFF_ALIGN_SZ-1));
 
 	pcmdpriv->rsp_allocated_buf = rtw_zmalloc(MAX_RSPSZ + 4);
 
 	if (!pcmdpriv->rsp_allocated_buf) {
-		res = -ENOMEM;
-		goto exit;
+		kfree(pcmdpriv->cmd_allocated_buf);
+		return -ENOMEM;
 	}
 
 	pcmdpriv->rsp_buf = pcmdpriv->rsp_allocated_buf  +  4 - ((SIZE_PTR)(pcmdpriv->rsp_allocated_buf) & 3);
@@ -197,8 +193,8 @@ int rtw_init_cmd_priv(struct	cmd_priv *pcmdpriv)
 	pcmdpriv->cmd_issued_cnt = pcmdpriv->cmd_done_cnt = pcmdpriv->rsp_cnt = 0;
 
 	mutex_init(&pcmdpriv->sctx_mutex);
-exit:
-	return res;
+
+	return 0;
 }
 
 static void c2h_wk_callback(_workitem *work);
-- 
2.35.1