linux-kernel - [PATCH] firewire: sbp2: fix freeing of unallocated memory

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Message-ID: <tkrat.9397e8b23fce40ec@s5r6.in-berlin.de>
Date:	Thu, 3 Sep 2009 23:07:35 +0200 (CEST)
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	linux1394-devel@...ts.sourceforge.net
cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] firewire: sbp2: fix freeing of unallocated memory

If a target writes invalid status (typically status of a command that
already timed out, firewire-sbp2 attempts to put away an ORB that
doesn't exist.  https://bugzilla.redhat.com/show_bug.cgi?id=519772

Signed-off-by: Stefan Richter <stefanr@...6.in-berlin.de>
---
 drivers/firewire/sbp2.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

Index: linux/drivers/firewire/sbp2.c
===================================================================
--- linux.orig/drivers/firewire/sbp2.c
+++ linux/drivers/firewire/sbp2.c
@@ -456,12 +456,12 @@ static void sbp2_status_write(struct fw_
 	}
 	spin_unlock_irqrestore(&card->lock, flags);
 
-	if (&orb->link != &lu->orb_list)
+	if (&orb->link != &lu->orb_list) {
 		orb->callback(orb, &status);
-	else
+		kref_put(&orb->kref, free_orb);
+	} else {
 		fw_error("status write for unknown orb\n");
-
-	kref_put(&orb->kref, free_orb);
+	}
 
 	fw_send_response(card, request, RCODE_COMPLETE);
 }

-- 
Stefan Richter
-=====-==--= =--= ---==
http://arcgraph.de/sr/

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