Changeset 25897 in vbox for trunk/src/VBox

Timestamp:

Jan 18, 2010 3:31:35 PM (15 years ago)

Author:

vboxsync

Message:

ATA: ataIOPortReadStr1: deal with the unlikely case where no data (or not enough for the read length operation) is available; go back to ring 3.

File:

• trunk/src/VBox/Devices/Storage/DevATA.cpp (modified) (1 diff)

trunk/src/VBox/Devices/Storage/DevATA.cpp

@@ -5388 +5388 @@
         cTransAvailable = (s->iIOBufferPIODataEnd - s->iIOBufferPIODataStart) / cb;
 #ifndef IN_RING3
+        /* Deal with the unlikely case where no data (or not enough for the read length operation) is available; go back to ring 3. */
+        if (!cTransAvailable)
+        {
+            PDMCritSectLeave(&pCtl->lock);
+            return VINF_IOM_HC_IOPORT_READ;
+        }
+
         /* The last transfer unit cannot be handled in GC, as it involves thread communication. */
         cTransAvailable--;