Commit 39424539 authored Jul 04, 2009 by Julia Lawall Committed by David S. Miller Jul 05, 2009

drivers/net/smsc911x.c: Fix resource size off by 1 error

The call resource_size(res) returns res->end - res->start + 1 and thus the
second change is semantics-preserving.  res_size is then used as the second
argument of a call to request_mem_region, and the memory allocated by this
call appears to be the same as what is released in the two calls to
release_mem_region.  So the size argument for those calls should be
resource_size(size) as well.  Alternatively, in the second call to
release_mem_region, the second argument could be res_size, as that variable
has already been initialized at the point of this call.

The problem was found using the following semantic patch:
(http://www.emn.fr/x-info/coccinelle/

)

// <smpl>
@@
struct resource *res;
@@

- (res->end - res->start) + 1
+ resource_size(res)

@@
struct resource *res;
@@

- res->end - res->start
+ BAD(resource_size(res))
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 4c3dd308

drivers/net/smsc911x.c

+3 −3

Original line number	Diff line number	Diff line
		@@ -1938,7 +1938,7 @@ static int __devexit smsc911x_drv_remove(struct platform_device *pdev)
		if (!res)
		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

		release_mem_region(res->start, res->end - res->start);
		release_mem_region(res->start, resource_size(res));

		iounmap(pdata->ioaddr);

		@@ -1976,7 +1976,7 @@ static int __devinit smsc911x_drv_probe(struct platform_device *pdev)
		retval = -ENODEV;
		goto out_0;
		}
		res_size = res->end - res->start + 1;
		res_size = resource_size(res);

		irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
		if (!irq_res) {
		@@ -2104,7 +2104,7 @@ out_unmap_io_3:
		out_free_netdev_2:
		free_netdev(dev);
		out_release_io_1:
		release_mem_region(res->start, res->end - res->start);
		release_mem_region(res->start, resource_size(res));
		out_0:
		return retval;
		}