linux-kernel - [PATCH 11/12] staging: r8188eu: fix potential memory leak in _rtw_init_xmit

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Date:   Tue,  3 May 2022 15:02:24 +0800
From:   xkernel.wang@...mail.com
To:     Larry.Finger@...inger.net, phil@...lpotter.co.uk,
        gregkh@...uxfoundation.org
Cc:     linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Xiaoke Wang <xkernel.wang@...mail.com>
Subject: [PATCH 11/12] staging: r8188eu: fix potential memory leak in _rtw_init_xmit_priv()

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

In _rtw_init_xmit_priv(), there are several error paths for allocation
failures just jump to the `exit` section. However, there is no action
will be performed, so the allocated resources are not properly released,
which leads to various memory leaks.

To properly release them, this patch unifies the error handling code and
several error handling paths are added.
According to the allocation sequence, if the validation fails, it will
jump to its corresponding error tag to release the resources.

Signed-off-by: Xiaoke Wang <xkernel.wang@...mail.com>
---
 drivers/staging/r8188eu/core/rtw_xmit.c | 32 ++++++++++++++++++-------
 1 file changed, 24 insertions(+), 8 deletions(-)

diff --git a/drivers/staging/r8188eu/core/rtw_xmit.c b/drivers/staging/r8188eu/core/rtw_xmit.c
index d086812..4c54647 100644
--- a/drivers/staging/r8188eu/core/rtw_xmit.c
+++ b/drivers/staging/r8188eu/core/rtw_xmit.c
@@ -112,7 +112,7 @@ s32	_rtw_init_xmit_priv(struct xmit_priv *pxmitpriv, struct adapter *padapter)
 
 	if (!pxmitpriv->pallocated_xmitbuf) {
 		res = _FAIL;
-		goto exit;
+		goto free_frame_buf;
 	}
 
 	pxmitpriv->pxmitbuf = (u8 *)N_BYTE_ALIGMENT((size_t)(pxmitpriv->pallocated_xmitbuf), 4);
@@ -134,7 +134,7 @@ s32	_rtw_init_xmit_priv(struct xmit_priv *pxmitpriv, struct adapter *padapter)
 			msleep(10);
 			res = rtw_os_xmit_resource_alloc(padapter, pxmitbuf, (MAX_XMITBUF_SZ + XMITBUF_ALIGN_SZ));
 			if (res == _FAIL)
-				goto exit;
+				goto free_xmitbuf;
 		}
 
 		pxmitbuf->flags = XMIT_VO_QUEUE;
@@ -152,7 +152,7 @@ s32	_rtw_init_xmit_priv(struct xmit_priv *pxmitpriv, struct adapter *padapter)
 
 	if (!pxmitpriv->pallocated_xmit_extbuf) {
 		res = _FAIL;
-		goto exit;
+		goto free_xmitbuf;
 	}
 
 	pxmitpriv->pxmit_extbuf = (u8 *)N_BYTE_ALIGMENT((size_t)(pxmitpriv->pallocated_xmit_extbuf), 4);
@@ -167,10 +167,8 @@ s32	_rtw_init_xmit_priv(struct xmit_priv *pxmitpriv, struct adapter *padapter)
 		pxmitbuf->ext_tag = true;
 
 		res = rtw_os_xmit_resource_alloc(padapter, pxmitbuf, max_xmit_extbuf_size + XMITBUF_ALIGN_SZ);
-		if (res == _FAIL) {
-			res = _FAIL;
-			goto exit;
-		}
+		if (res == _FAIL)
+			goto free_xmit_extbuf;
 
 		list_add_tail(&pxmitbuf->list, &pxmitpriv->free_xmit_extbuf_queue.queue);
 		pxmitbuf++;
@@ -200,8 +198,26 @@ s32	_rtw_init_xmit_priv(struct xmit_priv *pxmitpriv, struct adapter *padapter)
 
 	rtl8188eu_init_xmit_priv(padapter);
 
-exit:
+	return _SUCCESS;
 
+free_xmit_extbuf:
+	pxmitbuf = (struct xmit_buf *)pxmitpriv->pxmit_extbuf;
+	while (i-- > 0) {
+		rtw_os_xmit_resource_free(padapter, pxmitbuf, (max_xmit_extbuf_size + XMITBUF_ALIGN_SZ));
+		pxmitbuf++;
+	}
+	vfree(pxmitpriv->pallocated_xmit_extbuf);
+	i = NR_XMITBUFF;
+free_xmitbuf:
+	pxmitbuf = (struct xmit_buf *)pxmitpriv->pxmitbuf;
+	while (i-- > 0) {
+		rtw_os_xmit_resource_free(padapter, pxmitbuf, (MAX_XMITBUF_SZ + XMITBUF_ALIGN_SZ));
+		pxmitbuf++;
+	}
+	vfree(pxmitpriv->pallocated_xmitbuf);
+free_frame_buf:
+	vfree(pxmitpriv->pallocated_frame_buf);
+exit:
 	return res;
 }
 
--