cciss: Fix excessive gendisk freeing bug on driver unload.

Fix bug that free_hba was calling put_disk for all gendisk[]
pointers -- all 1024 of them -- regardless of whether the were
used or not (NULL).  This bug could cause rmmod to oops if logical
drives had been deleted during the driver's lifetime.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 8 insertions, 7 deletions

diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 0a3c057c7785..3a6ca7de4c93 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -3893,15 +3893,16 @@ Enomem:
         return -1;
 }
 
-static void free_hba(int i)
+static void free_hba(int n)
 {
-        ctlr_info_t *p = hba[i];
-        int n;
+        ctlr_info_t *h = hba[n];
+        int i;
 
-        hba[i] = NULL;
-        for (n = 0; n < CISS_MAX_LUN; n++)
-                put_disk(p->gendisk[n]);
-        kfree(p);
+        hba[n] = NULL;
+        for (i = 0; i < h->highest_lun + 1; i++)
+                if (h->gendisk[i] != NULL)
+                        put_disk(h->gendisk[i]);
+        kfree(h);
 }
 
 /* Send a message CDB to the firmware. */