linux-kernel - [patch 2/2 v2] Staging: rtl8192e: pointer math bug in rtllib_rx

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Date:	Sun, 19 Jul 2015 13:52:33 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Mateusz Kulikowski <mateusz.kulikowski@...il.com>,
	Vaishali Thakkar <vthakkar1994@...il.com>,
	Mahati Chamarthy <mahati.chamarthy@...il.com>,
	Chen Gang <gang.chen.5i5j@...il.com>,
	Matthew Casey <mdcasey@...bloom.com>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [patch 2/2 v2] Staging: rtl8192e: pointer math bug in
 rtllib_rx_DELBA()

The pointer math here was totally wrong so we were reading nonsense
information from beyond the end of the buffer.  It could lead to an oops
if that memory wasn't mapped.

The "pReasonCode" pointer is assigned but never used so I deleted it.

With-Fix-From: Mateusz Kulikowski <mateusz.kulikowski@...il.com>
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
v2: Mateusz noticed some more pointer math bugs on the next lines.

diff --git a/drivers/staging/rtl8192e/rtl819x_BAProc.c b/drivers/staging/rtl8192e/rtl819x_BAProc.c
index 60f536c..78ede4a 100644
--- a/drivers/staging/rtl8192e/rtl819x_BAProc.c
+++ b/drivers/staging/rtl8192e/rtl819x_BAProc.c
@@ -428,7 +428,6 @@ int rtllib_rx_DELBA(struct rtllib_device *ieee, struct sk_buff *skb)
 {
 	 struct rtllib_hdr_3addr *delba = NULL;
 	union delba_param_set *pDelBaParamSet = NULL;
-	u16 *pReasonCode = NULL;
 	u8 *dst = NULL;
 
 	if (skb->len < sizeof(struct rtllib_hdr_3addr) + 6) {
@@ -453,9 +452,7 @@ int rtllib_rx_DELBA(struct rtllib_device *ieee, struct sk_buff *skb)
 #endif
 	delba = (struct rtllib_hdr_3addr *)skb->data;
 	dst = (u8 *)(&delba->addr2[0]);
-	delba += sizeof(struct rtllib_hdr_3addr);
-	pDelBaParamSet = (union delba_param_set *)(delba+2);
-	pReasonCode = (u16 *)(delba+4);
+	pDelBaParamSet = (union delba_param_set *)&delba->payload[2];
 
 	if (pDelBaParamSet->field.Initiator == 1) {
 		struct rx_ts_record *pRxTs;
--
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