[PATCH] DAC960 fix for NULL dereference in open()

[Dave Olien]

This patch fixes a problem that's been hidden for a while.  DAC960_open()
will try to dereference a NULL pointer if an application opens
(for example) /dev/rd/c0d12 when there has never been a logical device
created for that file.


diff -ur linux-2.6.0-test3_mm2_original/drivers/block/DAC960.c linux-2.6.0-test3_mm2_DAC/drivers/block/DAC960.c
--- linux-2.6.0-test3_mm2_original/drivers/block/DAC960.c	2003-08-14 14:38:49.000000000 -0700
+++ linux-2.6.0-test3_mm2_DAC/drivers/block/DAC960.c	2003-08-15 09:39:48.000000000 -0700
@@ -82,7 +82,7 @@
 	} else {
 		DAC960_V2_LogicalDeviceInfo_T *i =
 			p->V2.LogicalDeviceInformation[drive_nr];
-		if (i->LogicalDeviceState == DAC960_V2_LogicalDevice_Offline)
+		if (!i || i->LogicalDeviceState == DAC960_V2_LogicalDevice_Offline)
 			return -ENXIO;
 	}
 
-
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