[patch 8/9] s390: dasd proc entries.

[patch 8/9] s390: dasd proc entries.

[Martin Schwidefsky]

From: Horst Hummel <horst.hummel@de.ibm.com>

[patch 8/9] s390: dasd proc entries.

The proc_mkdir calls in the dasd driver are not check for NULL
pointers. Add code to check the pointers and bail out if one of
the proc entries could not be created.

Signed-off-by: Horst Hummel <horst.hummel@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

 drivers/s390/block/dasd_proc.c |   17 +++++++++++++++++
 1 files changed, 17 insertions(+)

diff -urpN linux-2.6/drivers/s390/block/dasd_proc.c linux-2.6-patched/drivers/s390/block/dasd_proc.c
--- linux-2.6/drivers/s390/block/dasd_proc.c	2006-03-20 06:53:29.000000000 +0100
+++ linux-2.6-patched/drivers/s390/block/dasd_proc.c	2006-04-03 18:46:41.000000000 +0200
@@ -294,23 +294,40 @@ out_error:
 #endif				/* CONFIG_DASD_PROFILE */
 }
 
+/*
+ * Create dasd proc-fs entries.
+ * In case creation failed, cleanup and return -ENOENT.
+ */
 int
 dasd_proc_init(void)
 {
 	dasd_proc_root_entry = proc_mkdir("dasd", &proc_root);
+	if (!dasd_proc_root_entry)
+		goto out_nodasd;
 	dasd_proc_root_entry->owner = THIS_MODULE;
 	dasd_devices_entry = create_proc_entry("devices",
 					       S_IFREG | S_IRUGO | S_IWUSR,
 					       dasd_proc_root_entry);
+	if (!dasd_devices_entry)
+		goto out_nodevices;
 	dasd_devices_entry->proc_fops = &dasd_devices_file_ops;
 	dasd_devices_entry->owner = THIS_MODULE;
 	dasd_statistics_entry = create_proc_entry("statistics",
 						  S_IFREG | S_IRUGO | S_IWUSR,
 						  dasd_proc_root_entry);
+	if (!dasd_statistics_entry)
+		goto out_nostatistics;
 	dasd_statistics_entry->read_proc = dasd_statistics_read;
 	dasd_statistics_entry->write_proc = dasd_statistics_write;
 	dasd_statistics_entry->owner = THIS_MODULE;
 	return 0;
+
+ out_nostatistics:
+	remove_proc_entry("devices", dasd_proc_root_entry);
+ out_nodevices:
+	remove_proc_entry("dasd", &proc_root);
+ out_nodasd:
+	return -ENOENT;
 }
 
 void