linux-kernel - [patch] ntb: off by one sanity checks

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Message-ID: <20130122071914.GA8966@elgon.mountain>
Date:	Tue, 22 Jan 2013 10:19:14 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Jon Mason <jon.mason@...el.com>
Cc:	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
	kbuild@...org
Subject: [patch] ntb: off by one sanity checks

These tests are off by one.  If "mw" is equal to NTB_NUM_MW then we
would go beyond the end of the ndev->mw[] array.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/drivers/ntb/ntb_hw.c b/drivers/ntb/ntb_hw.c
index 4c71b17..5bf54f3 100644
--- a/drivers/ntb/ntb_hw.c
+++ b/drivers/ntb/ntb_hw.c
@@ -359,7 +359,7 @@ int ntb_read_remote_spad(struct ntb_device *ndev, unsigned int idx, u32 *val)
  */
 void *ntb_get_mw_vbase(struct ntb_device *ndev, unsigned int mw)
 {
-	if (mw > NTB_NUM_MW)
+	if (mw >= NTB_NUM_MW)
 		return NULL;
 
 	return ndev->mw[mw].vbase;
@@ -376,7 +376,7 @@ void *ntb_get_mw_vbase(struct ntb_device *ndev, unsigned int mw)
  */
 resource_size_t ntb_get_mw_size(struct ntb_device *ndev, unsigned int mw)
 {
-	if (mw > NTB_NUM_MW)
+	if (mw >= NTB_NUM_MW)
 		return 0;
 
 	return ndev->mw[mw].bar_sz;
@@ -394,7 +394,7 @@ resource_size_t ntb_get_mw_size(struct ntb_device *ndev, unsigned int mw)
  */
 void ntb_set_mw_addr(struct ntb_device *ndev, unsigned int mw, u64 addr)
 {
-	if (mw > NTB_NUM_MW)
+	if (mw >= NTB_NUM_MW)
 		return;
 
 	dev_dbg(&ndev->pdev->dev, "Writing addr %Lx to BAR %d\n", addr,
--
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