linux-kernel - [PATCH] staging: 7811: Fix memory leak in _r8712_init_xmit

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Date:   Wed, 12 Jul 2023 15:57:32 -0500
From:   Larry Finger <Larry.Finger@...inger.net>
To:     gregkh@...uxfoundation.org
Cc:     linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        linux-wireless@...r.kernel.org,
        Larry Finger <Larry.Finger@...inger.net>,
        syzbot+cf71097ffb6755df8251@...kaller.appspotmail.com,
        stable@...r.kernel.org
Subject: [PATCH] staging: 7811: Fix memory leak in _r8712_init_xmit_priv

In the above mentioned routine, memory is allocated in several places.
If the first succeeds and a later one fails, the routine will leak memory.
Fixes commit 2865d42c78a9 ("staging: r8712u: Add the new driver to the
mainline kernel").

Fixes: 2865d42c78a9 ("staging: r8712u: Add the new driver to the mainline kernel")
Reported-by: syzbot+cf71097ffb6755df8251@...kaller.appspotmail.com
Cc: stable@...r.kernel.org
Signed-off-by: Larry Finger <Larry.Finger@...inger.net>
---
 drivers/staging/rtl8712/rtl871x_xmit.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/drivers/staging/rtl8712/rtl871x_xmit.c b/drivers/staging/rtl8712/rtl871x_xmit.c
index 090345bad223..16b815588b97 100644
--- a/drivers/staging/rtl8712/rtl871x_xmit.c
+++ b/drivers/staging/rtl8712/rtl871x_xmit.c
@@ -117,11 +117,8 @@ int _r8712_init_xmit_priv(struct xmit_priv *pxmitpriv,
 	_init_queue(&pxmitpriv->pending_xmitbuf_queue);
 	pxmitpriv->pallocated_xmitbuf =
 		kmalloc(NR_XMITBUFF * sizeof(struct xmit_buf) + 4, GFP_ATOMIC);
-	if (!pxmitpriv->pallocated_xmitbuf) {
-		kfree(pxmitpriv->pallocated_frame_buf);
-		pxmitpriv->pallocated_frame_buf = NULL;
-		return -ENOMEM;
-	}
+	if (!pxmitpriv->pallocated_xmitbuf)
+		goto clean_up_frame_buf;
 	pxmitpriv->pxmitbuf = pxmitpriv->pallocated_xmitbuf + 4 -
 			      ((addr_t)(pxmitpriv->pallocated_xmitbuf) & 3);
 	pxmitbuf = (struct xmit_buf *)pxmitpriv->pxmitbuf;
@@ -130,12 +127,12 @@ int _r8712_init_xmit_priv(struct xmit_priv *pxmitpriv,
 		pxmitbuf->pallocated_buf =
 			kmalloc(MAX_XMITBUF_SZ + XMITBUF_ALIGN_SZ, GFP_ATOMIC);
 		if (!pxmitbuf->pallocated_buf)
-			return -ENOMEM;
+			goto clean_up_xmit_buf;
 		pxmitbuf->pbuf = pxmitbuf->pallocated_buf + XMITBUF_ALIGN_SZ -
 				 ((addr_t) (pxmitbuf->pallocated_buf) &
 				 (XMITBUF_ALIGN_SZ - 1));
 		if (r8712_xmit_resource_alloc(padapter, pxmitbuf))
-			return -ENOMEM;
+			goto clean_up_xmit_buf;
 		list_add_tail(&pxmitbuf->list,
 				 &(pxmitpriv->free_xmitbuf_queue.queue));
 		pxmitbuf++;
@@ -146,6 +143,14 @@ int _r8712_init_xmit_priv(struct xmit_priv *pxmitpriv,
 	init_hwxmits(pxmitpriv->hwxmits, pxmitpriv->hwxmit_entry);
 	tasklet_setup(&pxmitpriv->xmit_tasklet, r8712_xmit_bh);
 	return 0;
+
+clean_up_xmit_buf:
+	kfree(pxmitbuf->pallocated_xmitbuf);
+	pxmitbuf->pallocated_buf = NULL;
+clean_up_frame_buf:
+	kfree(pxmitpriv->pallocated_frame_buf);
+	pxmitpriv->pallocated_frame_buf = NULL;
+	return -ENOMEM;
 }
 
 void _free_xmit_priv(struct xmit_priv *pxmitpriv)
-- 
2.41.0