Commit 5457e03d authored Nov 21, 2016 by Gerald Schaefer Committed by Martin Schwidefsky Dec 12, 2016

s390/vmlogrdr: fix IUCV buffer allocation



The buffer for iucv_message_receive() needs to be below 2 GB. In
__iucv_message_receive(), the buffer address is casted to an u32, which
would result in either memory corruption or an addressing exception when
using addresses >= 2 GB.

Fix this by using GFP_DMA for the buffer allocation.

Cc: stable@vger.kernel.org
Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

parent 9e6e7c74

drivers/s390/char/vmlogrdr.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -870,7 +870,7 @@ static int __init vmlogrdr_init(void)
		goto cleanup;

		for (i=0; i < MAXMINOR; ++i ) {
		sys_ser[i].buffer = (char *) get_zeroed_page(GFP_KERNEL);
		sys_ser[i].buffer = (char *) get_zeroed_page(GFP_KERNEL \| GFP_DMA);
		if (!sys_ser[i].buffer) {
		rc = -ENOMEM;
		break;