linux-kernel - [patch] drbd: silence underflow warning in read_in

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Message-ID: <20140506112832.GA25561@mwanda>
Date:	Tue, 6 May 2014 14:28:32 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Lars Ellenberg <drbd-dev@...ts.linbit.com>
Cc:	drbd-user@...ts.linbit.com, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [patch] drbd: silence underflow warning in read_in_block()

My static checker warns that "data_size" could be negative and underflow
the limit check.  The code looks suspicious but I don't know if it is a
real bug.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index b6c8aaf..15daf86d 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -1528,7 +1528,7 @@ read_in_block(struct drbd_peer_device *peer_device, u64 id, sector_t sector,
 	struct drbd_peer_request *peer_req;
 	struct page *page;
 	int dgs, ds, err;
-	int data_size = pi->size;
+	unsigned int data_size = pi->size;
 	void *dig_in = peer_device->connection->int_dig_in;
 	void *dig_vv = peer_device->connection->int_dig_vv;
 	unsigned long *data;
--
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