linux-kernel - [PATCH] staging: r8188eu: add kfree() on an error path of rtw_xmit_resource

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Date:   Sat, 10 Sep 2022 08:29:56 +0800
From:   xkernel.wang@...mail.com
To:     Larry.Finger@...inger.net, phil@...lpotter.co.uk,
        gregkh@...uxfoundation.org, philipp.g.hortmann@...il.com
Cc:     linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Xiaoke Wang <xkernel.wang@...mail.com>
Subject: [PATCH] staging: r8188eu: add kfree() on an error path of rtw_xmit_resource_alloc()

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

In rtw_xmit_resource_alloc(), if usb_alloc_urb() fails, then the memory
`pxmitbuf->pallocated_buf` which is allocated by kzalloc() is not properly
released before returning.

So this patch adds kfree() on the above error path to release it. As there
is no proper device to test with, no runtime testing was performed.

Signed-off-by: Xiaoke Wang <xkernel.wang@...mail.com>
---
 drivers/staging/r8188eu/core/rtw_xmit.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/r8188eu/core/rtw_xmit.c b/drivers/staging/r8188eu/core/rtw_xmit.c
index 67f9c05..9c39d08 100644
--- a/drivers/staging/r8188eu/core/rtw_xmit.c
+++ b/drivers/staging/r8188eu/core/rtw_xmit.c
@@ -44,8 +44,10 @@ static int rtw_xmit_resource_alloc(struct adapter *padapter, struct xmit_buf *px
 	pxmitbuf->dma_transfer_addr = 0;
 
 	pxmitbuf->pxmit_urb = usb_alloc_urb(0, GFP_KERNEL);
-	if (!pxmitbuf->pxmit_urb)
+	if (!pxmitbuf->pxmit_urb) {
+		kfree(pxmitbuf->pallocated_buf);
 		return _FAIL;
+	}
 
 	return _SUCCESS;
 }
--