linux-kernel - [lvc-project] [PATCH] staging: rtl8712: fix buffer overflow in r8712_xmitframe

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Date:   Tue, 19 Sep 2023 12:23:18 +0300
From:   Igor Artemiev <Igor.A.Artemiev@...t.ru>
To:     Larry Finger <Larry.Finger@...inger.net>
Cc:     Igor Artemiev <Igor.A.Artemiev@...t.ru>,
        Florian Schilhabel <florian.c.schilhabel@...glemail.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        lvc-project@...uxtesting.org
Subject: [lvc-project] [PATCH] staging: rtl8712: fix buffer overflow in r8712_xmitframe_complete()

The value of pxmitframe->attrib.priority in r8712_issue_addbareq_cmd(),
which dump_xframe() calls, is used to calculate the index for accessing 
an array of size 16. The value of pxmitframe->attrib.priority can be 
greater than 15, because the r8712_update_attrib() function can write 
a value up to 31 to attrib.priority, and r8712_xmitframe_complete() 
checks that pxmitframe->attrib.priority is less than 16 before 
calling r8712_xmitframe_coalesce().

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Igor Artemiev <Igor.A.Artemiev@...t.ru>
---
 drivers/staging/rtl8712/rtl8712_xmit.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/rtl8712/rtl8712_xmit.c b/drivers/staging/rtl8712/rtl8712_xmit.c
index 4cb01f590673..8a39a3c8cfcb 100644
--- a/drivers/staging/rtl8712/rtl8712_xmit.c
+++ b/drivers/staging/rtl8712/rtl8712_xmit.c
@@ -669,7 +669,7 @@ int r8712_xmitframe_complete(struct _adapter *padapter,
 			 */
 			r8712_xmit_complete(padapter, pxmitframe);
 		}
-		if (res == _SUCCESS)
+		if (res == _SUCCESS && pxmitframe->attrib.priority <= 15)
 			dump_xframe(padapter, pxmitframe);
 		else
 			r8712_free_xmitframe_ex(pxmitpriv, pxmitframe);
-- 
2.30.2