[PATCH] 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>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/drivers/s390/block/dasd_proc.c b/drivers/s390/block/dasd_proc.c
index 1aa3c261718a..ad23aede356c 100644
--- a/drivers/s390/block/dasd_proc.c
+++ b/drivers/s390/block/dasd_proc.c
@@ -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