linux-kernel - [PATCH] scsi/sym53c8xx_2: Fix NULL pointer dereference in slave

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Message-Id: <1322958234-9749-1-git-send-email-psomas@gentoo.org>
Date:	Sun,  4 Dec 2011 02:23:54 +0200
From:	psomas@...too.org
To:	linux-scsi@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	JBottomley@...allels.com, matthew@....cx, Martin.vGagern@....net
Subject: [PATCH] scsi/sym53c8xx_2: Fix NULL pointer dereference in slave_destroy

From: Stratos Psomadakis <psomas@...too.org>

sym53c8xx_slave_destroy unconditionally assumes that sym53c8xx_slave_alloc has
succesesfully allocated a sym_lcb. This can lead to a NULL pointer dereference
(exposed by commit 4e6c82b).

Signed-off-by: Stratos Psomadakis <psomas@...too.org>
Cc: stable@...r.kernel.org
---

 drivers/scsi/sym53c8xx_2/sym_glue.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/scsi/sym53c8xx_2/sym_glue.c b/drivers/scsi/sym53c8xx_2/sym_glue.c
index b4543f5..76432f8 100644
--- a/drivers/scsi/sym53c8xx_2/sym_glue.c
+++ b/drivers/scsi/sym53c8xx_2/sym_glue.c
@@ -839,6 +839,10 @@ static void sym53c8xx_slave_destroy(struct scsi_device *sdev)
 	struct sym_lcb *lp = sym_lp(tp, sdev->lun);
 	unsigned long flags;
 
+	/* if slave_alloc returned before allocating a sym_lcb, return */
+	if (!lp)
+		return;
+
 	spin_lock_irqsave(np->s.host->host_lock, flags);
 
 	if (lp->busy_itlq || lp->busy_itl) {
-- 
1.7.8.rc1
--
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