Commit fffe487d authored Nov 08, 2007 by Tejun Heo Committed by Jens Axboe Nov 08, 2007

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@gmail.com>
Acked-by: Peter Osterlund <petero2@telia.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

parent 8ec680e4

drivers/block/pktcdvd.c

+9 −0

Original line number	Diff line number	Diff line
		@@ -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;
		}