This patch fixes a segmentation fault that can occur in the Local Disk Manager
when the queries for getting the geometry of the disk return a value of zero
for either the number of heads or the number of sectors per track.

--- evms-2.5.5/plugins/disk/localdskmgr.c	2006-02-24 13:53:21.000000000 -0600
+++ evms-2.5.5-fix/plugins/disk/localdskmgr.c	2006-09-01 11:41:56.681089000 -0500
@@ -1552,16 +1552,25 @@
 
 	LOG_ENTRY();
 
-	/* Set defaults */
-	disk->geometry.heads = 255;
-	disk->geometry.sectors_per_track = 63;
-
 	rc = get_partition_table_geometry(disk);
 
 	if (rc != 0) {
-		get_kernel_geometry(disk);
+		rc = get_kernel_geometry(disk);
+	}
+
+	/* Set defaults if no valid geometry was found. */
+	if (disk->geometry.heads == 0) {
+		LOG_DEBUG("Disk %s: Heads is zero - setting to 255.\n",
+			  disk->name);
+		disk->geometry.heads = 255;
+	}
+	if (disk->geometry.sectors_per_track == 0) {
+		LOG_DEBUG("Disk %s: Sectors-per-track is zero - "
+			  "setting to 63.\n", disk->name);
+		disk->geometry.sectors_per_track = 63;
 	}
 
+	/* Calculate number of cylinders based on other geometry fields. */
 	disk->geometry.cylinders = disk->size /
 				   (disk->geometry.heads *
 				    disk->geometry.sectors_per_track *