linux-kernel - [PATCH] pktcdvd: fix BUG caused by sysfs module reference semantics change

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Message-ID: <47327404.9010008@gmail.com>
Date:	Thu, 08 Nov 2007 11:27:16 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Peter Osterlund <petero2@...ia.com>, gregkh@...e.de
CC:	Thomas Maier <balagi@...tmail.de>,
	Jens Axboe <jens.axboe@...cle.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH] pktcdvd: fix BUG caused by sysfs module reference semantics
 change

pkt_setup_dev() expects module reference to be held on invocation.
This used to be true for sysfs callbacks but not anymore.  Test and
grab module reference around pkt_setup_dev() in
class_pktcdvd_store_add().

Signed-off-by: Tejun Heo <htejun@...il.com>
Acked-by: Peter Osterlund <petero2@...ia.com>
---
Greg, can you please push this patch through your tree? 
Thanks a lot.

 drivers/block/pktcdvd.c |    9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index a8130a4..a5ee213 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -358,10 +358,19 @@ static ssize_t class_pktcdvd_store_add(struct class *c, const char *buf,
 					size_t count)
 {
 	unsigned int major, minor;
+
 	if (sscanf(buf, "%u:%u", &major, &minor) == 2) {
+		/* pkt_setup_dev() expects caller to hold reference to self */
+		if (!try_module_get(THIS_MODULE))
+			return -ENODEV;
+
 		pkt_setup_dev(MKDEV(major, minor), NULL);
+
+		module_put(THIS_MODULE);
+
 		return count;
 	}
+
 	return -EINVAL;
 }
 
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