linux-kernel - [PATCH] [staging][r8188eu]: memory leak in rtw_free_cmd_obj if command is (_Set_Drv

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Message-ID: <1395152727.31547.5.camel@wxm-ubuntu>
Date:	Tue, 18 Mar 2014 10:25:27 -0400
From:	"Wang, Xiaoming" <xiaoming.wang@...el.com>
To:	gregkh@...uxfoundation.org, valentina.manea.m@...il.com,
	dan.carpenter@...cle.com, standby24x7@...il.com
Cc:	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
	dongxing.zhang@...el.com, xiaoming.wang@...el.com,
	chuansheng.liu@...el.com
Subject: [PATCH] [staging][r8188eu]: memory leak in rtw_free_cmd_obj if
 command is (_Set_Drv_Extra)

pcmd->parmbuf->pbuf has been allocated if command is GEN_CMD_CODE(_Set_Drv_Extra),
and it enqueued by rtw_enqueue_cmd. rtw_cmd_thread dequeue pcmd by rtw_dequeue_cmd.
The memory leak happened on this branch "if( _FAIL == rtw_cmd_filter(pcmdpriv, pcmd) )"
which goto post_process directly against freeing pcmd->parmbuf->pbuf in
rtw_drvextra_cmd_hdl which is the cmd_hdl if command is (_Set_Drv_Extra).
This patch free pcmd->parmbuf->pbuf on the forgotten branch to avoid memory leak.

Signed-off-by: Zhang Dongxing <dongxing.zhang@...el.com>
Signed-off-by: xiaoming wang <xiaoming.wang@...el.com>

diff --git a/drivers/staging/rtl8188eu/core/rtw_cmd.c b/drivers/staging/rtl8188eu/core/rtw_cmd.c
index c0a0a52..1c7f505 100644
--- a/drivers/staging/rtl8188eu/core/rtw_cmd.c
+++ b/drivers/staging/rtl8188eu/core/rtw_cmd.c
@@ -288,7 +288,7 @@ int rtw_cmd_thread(void *context)
 	void (*pcmd_callback)(struct adapter *dev, struct cmd_obj *pcmd);
 	struct adapter *padapter = (struct adapter *)context;
 	struct cmd_priv *pcmdpriv = &(padapter->cmdpriv);
-
+	struct drvextra_cmd_parm *extra_parm = NULL;
 
 	thread_enter("RTW_CMD_THREAD");
 
@@ -323,6 +323,11 @@ _next:
 
 		if (_FAIL == rtw_cmd_filter(pcmdpriv, pcmd)) {
 			pcmd->res = H2C_DROPPED;
+			if (pcmd->cmdcode == GEN_CMD_CODE(_Set_Drv_Extra)) {
+				extra_parm = (struct drvextra_cmd_parm *)pcmd->parmbuf;
+				if (extra_parm && extra_parm->pbuf && extra_parm->size > 0)
+					rtw_mfree(extra_parm->pbuf, extra_parm->size);
+			}
 			goto post_process;
 		}
 

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