From 690e744869f3262855b83b4fb59199cf142765b0 Mon Sep 17 00:00:00 2001
From: Dave Jones <davej@redhat.com>
Date: Mon, 19 Oct 2009 19:55:13 -0400
Subject: [PATCH] [SCSI] gdth: Prevent negative offsets in ioctl CVE-2009-3080

A negative offset could be used to index before the event buffer and
lead to a security breach.

Signed-off-by: Dave Jones <davej@redhat.com>
Cc: Stable Tree <stable@kernel.org>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
---
 drivers/scsi/gdth.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/gdth.c b/drivers/scsi/gdth.c
index 185e6bc4dd40..9e8fce0f0c1b 100644
--- a/drivers/scsi/gdth.c
+++ b/drivers/scsi/gdth.c
@@ -2900,7 +2900,7 @@ static int gdth_read_event(gdth_ha_str *ha, int handle, gdth_evt_str *estr)
         eindex = handle;
     estr->event_source = 0;
 
-    if (eindex >= MAX_EVENTS) {
+    if (eindex < 0 || eindex >= MAX_EVENTS) {
         spin_unlock_irqrestore(&ha->smp_lock, flags);
         return eindex;
     }
-- 
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