linux-kernel - [cciss: PATCH 12/17] Fix excessive gendisk freeing bug on driver unload.

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Message-ID: <20090820151844.22833.66257.stgit@beardog.cce.hp.com>
Date:	Thu, 20 Aug 2009 10:18:44 -0500
From:	"Stephen M. Cameron" <scameron@...rdog.cce.hp.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-scsi@...r.kernel.org, akpm@...ux-foundation.org,
	axboe@...nel.dk, andrew.patterson@...com,
	mikem@...-ss-1-lb.cnet.com, scameron@...rdog.cce.hp.com
Subject: [cciss: PATCH 12/17] 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@...rdog.cce.hp.com>
---

 drivers/block/cciss.c |   15 ++++++++-------
 1 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 14d4cd6..a4cb041 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -3892,15 +3892,16 @@ 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. */

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