linux-kernel - [PATCH] scsi: mpt2sas: mpt2sas_base.c: Fix for possible null pointer dereference

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Message-Id: <1400429439-11184-1-git-send-email-rickard_strandqvist@spectrumdigital.se>
Date:	Sun, 18 May 2014 18:10:39 +0200
From:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
To:	Nagalakshmi Nandigama <Nagalakshmi.Nandigama@....com>,
	Sreekanth Reddy <Sreekanth.Reddy@....com>
Cc:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>,
	support@....com, "James E.J. Bottomley" <JBottomley@...allels.com>,
	DL-MPTFusionLinux@....com, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] scsi: mpt2sas: mpt2sas_base.c:  Fix for possible null pointer dereference

There is otherwise a risk of a possible null pointer dereference.

Was largely found by using a static code analysis program called cppcheck.

Signed-off-by: Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
---
 drivers/scsi/mpt2sas/mpt2sas_base.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/mpt2sas/mpt2sas_base.c b/drivers/scsi/mpt2sas/mpt2sas_base.c
index bde63f7..7ccc7e4 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_base.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_base.c
@@ -3581,7 +3581,9 @@ mpt2sas_port_enable_done(struct MPT2SAS_ADAPTER *ioc, u16 smid, u8 msix_index,
 	}
 	ioc->port_enable_cmds.status &= ~MPT2_CMD_PENDING;
 
-	ioc_status = le16_to_cpu(mpi_reply->IOCStatus) & MPI2_IOCSTATUS_MASK;
+	if (mpi_reply) {
+		ioc_status = le16_to_cpu(mpi_reply->IOCStatus) & MPI2_IOCSTATUS_MASK;
+	}
 
 	if (ioc_status != MPI2_IOCSTATUS_SUCCESS)
 		ioc->port_enable_failed = 1;
-- 
1.7.10.4

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