linux-kernel - [PATCH 74/91] sym53c8xx: Fix NULL pointer dereference in slave

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Date:	Sun, 05 Feb 2012 23:11:03 +0100
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Stratos Psomadakis <psomas@...too.org>,
	James Bottomley <JBottomley@...allels.com>,
	Greg KH <gregkh@...uxfoundation.org>
Subject: [PATCH 74/91] sym53c8xx: Fix NULL pointer dereference in slave_destroy

2.6.27-longterm review patch.  If anyone has any objections, please let us know.

------------------

commit cced5041ed5a2d1352186510944b0ddfbdbe4c0b upstream.

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>
Signed-off-by: James Bottomley <JBottomley@...allels.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 drivers/scsi/sym53c8xx_2/sym_glue.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

Index: longterm-2.6.27/drivers/scsi/sym53c8xx_2/sym_glue.c
===================================================================
--- longterm-2.6.27.orig/drivers/scsi/sym53c8xx_2/sym_glue.c	2012-02-05 22:34:32.760914610 +0100
+++ longterm-2.6.27/drivers/scsi/sym53c8xx_2/sym_glue.c	2012-02-05 22:34:45.383915058 +0100
@@ -821,6 +821,10 @@
 	struct sym_hcb *np = sym_get_hcb(sdev->host);
 	struct sym_lcb *lp = sym_lp(&np->target[sdev->id], sdev->lun);
 
+	/* if slave_alloc returned before allocating a sym_lcb, return */
+	if (!lp)
+		return;
+
 	if (lp->itlq_tbl)
 		sym_mfree_dma(lp->itlq_tbl, SYM_CONF_MAX_TASK * 4, "ITLQ_TBL");
 	kfree(lp->cb_tags);


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