[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>
diff --git a/drivers/scsi/gdth.c b/drivers/scsi/gdth.c
index 185e6bc..9e8fce0 100644
--- a/drivers/scsi/gdth.c
+++ b/drivers/scsi/gdth.c
@@ -2900,7 +2900,7 @@
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;
}