linux-kernel - [PATCH 2/3] [SCSI] mvsas: fix shift in mvs_94xx_free_reg

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Message-Id: <1352145183-29355-3-git-send-email-xi.wang@gmail.com>
Date:	Mon,  5 Nov 2012 14:53:02 -0500
From:	Xi Wang <xi.wang@...il.com>
To:	Xiangliang Yu <yuxiangl@...vell.com>
Cc:	Xi Wang <xi.wang@...il.com>,
	"James E.J. Bottomley" <JBottomley@...allels.com>,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] [SCSI] mvsas: fix shift in mvs_94xx_free_reg_set()

Invoking bit(n) with n >= 64 is undefined behavior, since bit(n) does
a 64-bit shift.  This patch adds a check on the shifting amount.

Signed-off-by: Xi Wang <xi.wang@...il.com>
---
 drivers/scsi/mvsas/mv_94xx.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/mvsas/mv_94xx.c b/drivers/scsi/mvsas/mv_94xx.c
index 7e423e5..e1f35d4 100644
--- a/drivers/scsi/mvsas/mv_94xx.c
+++ b/drivers/scsi/mvsas/mv_94xx.c
@@ -715,11 +715,13 @@ static void mvs_94xx_free_reg_set(struct mvs_info *mvi, u8 *tfs)
 	if (*tfs == MVS_ID_NOT_MAPPED)
 		return;
 
-	mvi->sata_reg_set &= ~bit(reg_set);
-	if (reg_set < 32)
+	if (reg_set < 32) {
+		mvi->sata_reg_set &= ~bit(reg_set);
 		w_reg_set_enable(reg_set, (u32)mvi->sata_reg_set);
-	else
+	} else if (reg_set < 64) {
+		mvi->sata_reg_set &= ~bit(reg_set);
 		w_reg_set_enable(reg_set, (u32)(mvi->sata_reg_set >> 32));
+	}
 
 	*tfs = MVS_ID_NOT_MAPPED;
 
-- 
1.7.10.4

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