[SCSI] gdth: Prevent negative offsets in ioctl CVE-2009-3080

[safe/jmp/linux-2.6] / drivers / scsi / gdth.c

diff --git a/drivers/scsi/gdth.c b/drivers/scsi/gdth.c
index 185e6bc..9e8fce0 100644 (file)
--- 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;
     }