linux-kernel - [PATCH 2.6.32 41/62] staging: vt6655: device_rx_srv check sk

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Message-Id: <20150912225608.334093025@1wt.eu>
Date:	Sun, 13 Sep 2015 00:56:47 +0200
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Malcolm Priestley <tvboxspy@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ben Hutchings <ben@...adent.org.uk>, Willy Tarreau <w@....eu>
Subject: [PATCH 2.6.32 41/62] staging: vt6655: device_rx_srv check sk_buff is NULL

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

------------------

From: Malcolm Priestley <tvboxspy@...il.com>

commit b5eeed8cb6097c8ea660b6598d36fdbb94065a22 upstream.

There is a small chance that pRD->pRDInfo->skb could go NULL
while the interrupt is processing.

Put NULL check on loop to break out.

Signed-off-by: Malcolm Priestley <tvboxspy@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
[bwh: Backported to 3.2: adjust context, indentation]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
(cherry picked from commit 35ee488df7402c0549f8329dc20690cf7fe22492)

Signed-off-by: Willy Tarreau <w@....eu>
---
 drivers/staging/vt6655/device_main.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/staging/vt6655/device_main.c b/drivers/staging/vt6655/device_main.c
index 269d1e2..1680bed 100644
--- a/drivers/staging/vt6655/device_main.c
+++ b/drivers/staging/vt6655/device_main.c
@@ -1605,6 +1605,10 @@ static int device_rx_srv(PSDevice pDevice, UINT uIdx) {
 //        DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO "pDevice->pCurrRD = %x, works = %d\n", pRD, works);
         if (works++>15)
             break;
+
+        if (!pRD->pRDInfo->skb)
+            break;
+
         if (device_receive_frame(pDevice, pRD)) {
             if (!device_alloc_rx_buf(pDevice,pRD)) {
                     DBG_PRT(MSG_LEVEL_ERR, KERN_ERR
-- 
1.7.12.2.21.g234cd45.dirty



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